12:28 p.m.
Hi,
Since the work on the integration of PPContext in PetitParser, there is
significant performance degradation. I have already mentioned that on
simple grammar the factor is about 2. But on complex grammar (for example,
our proprietary parser for 4D language ), we have seen that degradation is
goes well beyond this factor. So, for example, for 800K lines that we parse
in under 10 minutes without PPContext work, with the latest version it goes
beyond 2h.
I have not been able to reproduce my case on simple grammars. May be we can
have some benchmarks using open source parsers and large code bases (e.g.
PP Java Parser on JHotDraw or ArgoUML).
Currently, I circumvent this issue by using PP v1.51 but I can provide
relevant feedback and run benches on any improvements.
regards.
Usman
1:30 p.m.
Hi,
Hmm. I thought this was fixed and that you said at the end that the
performance penalty is no longer a factor of 2.
Do you have a simple example for checking the simple case of 2x performance
loss?
Doru
On Fri, Jan 30, 2015 at 12:28 PM, Usman Bhatti <usman.bhatti(a)gmail.com>
wrote:
Hi,
Since the work on the integration of PPContext in PetitParser, there is
significant performance degradation. I have already mentioned that on
simple grammar the factor is about 2. But on complex grammar (for example,
our proprietary parser for 4D language ), we have seen that degradation is
goes well beyond this factor. So, for example, for 800K lines that we parse
in under 10 minutes without PPContext work, with the latest version it goes
beyond 2h.
I have not been able to reproduce my case on simple grammars. May be we
can have some benchmarks using open source parsers and large code bases
(e.g. PP Java Parser on JHotDraw or ArgoUML).
Currently, I circumvent this issue by using PP v1.51 but I can provide
relevant feedback and run benches on any improvements.
regards.
Usman
_______________________________________________
Moose-dev mailing list
Moose-dev(a)iam.unibe.ch
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
--
www.tudorgirba.com
"Every thing has its own flow"
4:36 p.m.
Here is a script that shows the factor of 2 in time taken for parsing. The
idea of the script is to introduce several wrong branches before hitting
the correct one (originally proposed by Guillaume).
|rule wrongBranches|
[wrongBranches := (25 to: 45) inject: 24 asCharacter asParser into: [:acc
:each | acc / each asCharacter asParser].
rule := PPDelegateParser new.
rule setParser: $a asParser / ((wrongBranches / $. asParser), rule).
rule parse: (String streamContents: [ :s |
30000 timesRepeat: [s nextPut: $.]. s nextPut: $a ])] timeToRun
Below are the graphs that were generated when varying the string length
provided to the above parser description. Green part shows the time taken
by the older version and the red part with the latest PP.
[image: Inline image 2]
Data values and graph generated by the script in the attached file.
regards.
usman
On Fri, Jan 30, 2015 at 1:30 PM, Tudor Girba <tudor(a)tudorgirba.com> wrote:
Hi,
Hmm. I thought this was fixed and that you said at the end that the
performance penalty is no longer a factor of 2.
Do you have a simple example for checking the simple case of 2x
performance loss?
Doru
On Fri, Jan 30, 2015 at 12:28 PM, Usman Bhatti <usman.bhatti(a)gmail.com>
wrote:
> Hi,
>
> Since the work on the integration of PPContext in PetitParser, there is
> significant performance degradation. I have already mentioned that on
> simple grammar the factor is about 2. But on complex grammar (for example,
> our proprietary parser for 4D language ), we have seen that degradation is
> goes well beyond this factor. So, for example, for 800K lines that we parse
> in under 10 minutes without PPContext work, with the latest version it goes
> beyond 2h.
>
> I have not been able to reproduce my case on simple grammars. May be we
> can have some benchmarks using open source parsers and large code bases
> (e.g. PP Java Parser on JHotDraw or ArgoUML).
>
> Currently, I circumvent this issue by using PP v1.51 but I can provide
> relevant feedback and run benches on any improvements.
>
> regards.
>
> Usman
>
> _______________________________________________
> Moose-dev mailing list
> Moose-dev(a)iam.unibe.ch
> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>
>
--
www.tudorgirba.com
"Every thing has its own flow"
_______________________________________________
Moose-dev mailing list
Moose-dev(a)iam.unibe.ch
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
9:36 p.m.
Usman, this is a really cool bug report !
On 30 Jan 2015, at 16:36, Usman Bhatti <usman.bhatti(a)gmail.com>
wrote:
Here is a script that shows the factor of 2 in time taken for parsing. The idea of the
script is to introduce several wrong branches before hitting the correct one (originally
proposed by Guillaume).
|rule wrongBranches|
[wrongBranches := (25 to: 45) inject: 24 asCharacter asParser into: [:acc :each | acc /
each asCharacter asParser].
rule := PPDelegateParser new.
rule setParser: $a asParser / ((wrongBranches / $. asParser), rule).
rule parse: (String streamContents: [ :s |
30000 timesRepeat: [s nextPut: $.]. s nextPut: $a ])] timeToRun
Below are the graphs that were generated when varying the string length provided to the
above parser description. Green part shows the time taken by the older version and the red
part with the latest PP.
<graph.png>
Data values and graph generated by the script in the attached file.
regards.
usman
On Fri, Jan 30, 2015 at 1:30 PM, Tudor Girba <tudor(a)tudorgirba.com> wrote:
Hi,
Hmm. I thought this was fixed and that you said at the end that the performance penalty
is no longer a factor of 2.
Do you have a simple example for checking the simple case of 2x performance loss?
Doru
On Fri, Jan 30, 2015 at 12:28 PM, Usman Bhatti <usman.bhatti(a)gmail.com> wrote:
Hi,
Since the work on the integration of PPContext in PetitParser, there is significant
performance degradation. I have already mentioned that on simple grammar the factor is
about 2. But on complex grammar (for example, our proprietary parser for 4D language ), we
have seen that degradation is goes well beyond this factor. So, for example, for 800K
lines that we parse in under 10 minutes without PPContext work, with the latest version it
goes beyond 2h.
I have not been able to reproduce my case on simple grammars. May be we can have some
benchmarks using open source parsers and large code bases (e.g. PP Java Parser on JHotDraw
or ArgoUML).
Currently, I circumvent this issue by using PP v1.51 but I can provide relevant feedback
and run benches on any improvements.
regards.
Usman
_______________________________________________
Moose-dev mailing list
Moose-dev(a)iam.unibe.ch
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
--
www.tudorgirba.com
"Every thing has its own flow"
_______________________________________________
Moose-dev mailing list
Moose-dev(a)iam.unibe.ch
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
<script-graph.txt>_______________________________________________
Moose-dev mailing list
Moose-dev(a)iam.unibe.ch
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
8:55 p.m.
On Fri, Jan 30, 2015 at 9:36 PM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote:
Usman, this is a really cool bug report !
Thanks :)
> On 30 Jan 2015, at 16:36, Usman Bhatti <usman.bhatti(a)gmail.com> wrote:
>
> Here is a script that shows the factor of 2 in time taken for parsing.
The idea of the script is to introduce several wrong branches before
hitting the correct one (originally proposed by Guillaume).
>
> |rule wrongBranches|
> [wrongBranches := (25 to: 45) inject: 24 asCharacter asParser into:
[:acc :each | acc / each asCharacter asParser].
> rule := PPDelegateParser new.
> rule setParser: $a asParser / ((wrongBranches / $. asParser), rule).
> rule parse: (String streamContents: [ :s |
> 30000 timesRepeat: [s nextPut: $.]. s nextPut: $a ])] timeToRun
>
>
> Below are the graphs that were generated when varying the string length
provided to the above parser description. Green part shows the time taken
by the older version and the red part with the latest PP.
>
> <graph.png>
>
> Data values and graph generated by the script in the attached file.
>
> regards.
>
> usman
>
> On Fri, Jan 30, 2015 at 1:30 PM, Tudor Girba <tudor(a)tudorgirba.com>
wrote:
> Hi,
>
> Hmm. I thought this was fixed and that you said at the end that the
performance penalty is no longer a factor of 2.
>
> Do you have a simple example for checking the simple case of 2x
performance loss?
>
> Doru
>
>
> On Fri, Jan 30, 2015 at 12:28 PM, Usman Bhatti <usman.bhatti(a)gmail.com>
wrote:
> Hi,
>
> Since the work on the integration of PPContext in PetitParser, there is
significant performance degradation. I have already mentioned that on
simple grammar the factor is about 2. But on complex grammar (for example,
our proprietary parser for 4D language ), we have seen that degradation is
goes well beyond this factor. So, for example, for 800K lines that we parse
in under 10 minutes without PPContext work, with the latest version it goes
beyond 2h.
>
> I have not been able to reproduce my case on simple grammars. May be we
can have some benchmarks using open source parsers and large code bases
(e.g. PP Java Parser on JHotDraw or ArgoUML).
>
> Currently, I circumvent this issue by using PP v1.51 but I can provide
relevant feedback and run benches on any improvements.
>
> regards.
>
> Usman
>
> _______________________________________________
> Moose-dev mailing list
> Moose-dev(a)iam.unibe.ch
> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>
>
>
>
> --
> www.tudorgirba.com
>
> "Every thing has its own flow"
>
> _______________________________________________
> Moose-dev mailing list
> Moose-dev(a)iam.unibe.ch
> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>
>
> <script-graph.txt>_______________________________________________
> Moose-dev mailing list
> Moose-dev(a)iam.unibe.ch
> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
_______________________________________________
Moose-dev mailing list
Moose-dev(a)iam.unibe.ch
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
10:55 p.m.
Hey all, thanks for the report, I will have a look at it asap.
Cheers Jan
On 1 Feb 2015 20:55, "Usman Bhatti" <usman.bhatti(a)gmail.com> wrote:
On Fri, Jan 30, 2015 at 9:36 PM, Sven Van Caekenberghe <sven(a)stfx.eu>
wrote:
> Usman, this is a really cool bug report !
>
Thanks :)
>
> > On 30 Jan 2015, at 16:36, Usman Bhatti <usman.bhatti(a)gmail.com> wrote:
> >
> > Here is a script that shows the factor of 2 in time taken for parsing.
> The idea of the script is to introduce several wrong branches before
> hitting the correct one (originally proposed by Guillaume).
> >
> > |rule wrongBranches|
> > [wrongBranches := (25 to: 45) inject: 24 asCharacter asParser into:
> [:acc :each | acc / each asCharacter asParser].
> > rule := PPDelegateParser new.
> > rule setParser: $a asParser / ((wrongBranches / $. asParser), rule).
> > rule parse: (String streamContents: [ :s |
> > 30000 timesRepeat: [s nextPut: $.]. s nextPut: $a ])] timeToRun
> >
> >
> > Below are the graphs that were generated when varying the string length
> provided to the above parser description. Green part shows the time taken
> by the older version and the red part with the latest PP.
> >
> > <graph.png>
> >
> > Data values and graph generated by the script in the attached file.
> >
> > regards.
> >
> > usman
> >
> > On Fri, Jan 30, 2015 at 1:30 PM, Tudor Girba <tudor(a)tudorgirba.com>
> wrote:
> > Hi,
> >
> > Hmm. I thought this was fixed and that you said at the end that the
> performance penalty is no longer a factor of 2.
> >
> > Do you have a simple example for checking the simple case of 2x
> performance loss?
> >
> > Doru
> >
> >
> > On Fri, Jan 30, 2015 at 12:28 PM, Usman Bhatti <usman.bhatti(a)gmail.com>
> wrote:
> > Hi,
> >
> > Since the work on the integration of PPContext in PetitParser, there is
> significant performance degradation. I have already mentioned that on
> simple grammar the factor is about 2. But on complex grammar (for example,
> our proprietary parser for 4D language ), we have seen that degradation is
> goes well beyond this factor. So, for example, for 800K lines that we parse
> in under 10 minutes without PPContext work, with the latest version it goes
> beyond 2h.
> >
> > I have not been able to reproduce my case on simple grammars. May be we
> can have some benchmarks using open source parsers and large code bases
> (e.g. PP Java Parser on JHotDraw or ArgoUML).
> >
> > Currently, I circumvent this issue by using PP v1.51 but I can provide
> relevant feedback and run benches on any improvements.
> >
> > regards.
> >
> > Usman
> >
> > _______________________________________________
> > Moose-dev mailing list
> > Moose-dev(a)iam.unibe.ch
> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
> >
> >
> >
> >
> > --
> > www.tudorgirba.com
> >
> > "Every thing has its own flow"
> >
> > _______________________________________________
> > Moose-dev mailing list
> > Moose-dev(a)iam.unibe.ch
> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
> >
> >
> > <script-graph.txt>_______________________________________________
> > Moose-dev mailing list
> > Moose-dev(a)iam.unibe.ch
> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>
>
> _______________________________________________
> Moose-dev mailing list
> Moose-dev(a)iam.unibe.ch
> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>
_______________________________________________
Moose-dev mailing list
Moose-dev(a)iam.unibe.ch
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
9:04 a.m.
Hey all, Please note that a new version in of PetitParser (JanKurs-271)
should improve performance roughly comparable to the original performance.
On my computer, I got improvement from 3900ms to 1300ms.
Cheers,
Jan
On 1 February 2015 at 22:55, Jan Kurš <kurs.jan(a)gmail.com> wrote:
Hey all, thanks for the report, I will have a look at it asap.
Cheers Jan
On 1 Feb 2015 20:55, "Usman Bhatti" <usman.bhatti(a)gmail.com> wrote:
>
>
> On Fri, Jan 30, 2015 at 9:36 PM, Sven Van Caekenberghe <sven(a)stfx.eu>
> wrote:
>
>> Usman, this is a really cool bug report !
>>
>
> Thanks :)
>
>
>>
>> > On 30 Jan 2015, at 16:36, Usman Bhatti <usman.bhatti(a)gmail.com>
wrote:
>> >
>> > Here is a script that shows the factor of 2 in time taken for parsing.
>> The idea of the script is to introduce several wrong branches before
>> hitting the correct one (originally proposed by Guillaume).
>> >
>> > |rule wrongBranches|
>> > [wrongBranches := (25 to: 45) inject: 24 asCharacter asParser into:
>> [:acc :each | acc / each asCharacter asParser].
>> > rule := PPDelegateParser new.
>> > rule setParser: $a asParser / ((wrongBranches / $. asParser), rule).
>> > rule parse: (String streamContents: [ :s |
>> > 30000 timesRepeat: [s nextPut: $.]. s nextPut: $a ])] timeToRun
>> >
>> >
>> > Below are the graphs that were generated when varying the string
>> length provided to the above parser description. Green part shows the time
>> taken by the older version and the red part with the latest PP.
>> >
>> > <graph.png>
>> >
>> > Data values and graph generated by the script in the attached file.
>> >
>> > regards.
>> >
>> > usman
>> >
>> > On Fri, Jan 30, 2015 at 1:30 PM, Tudor Girba <tudor(a)tudorgirba.com>
>> wrote:
>> > Hi,
>> >
>> > Hmm. I thought this was fixed and that you said at the end that the
>> performance penalty is no longer a factor of 2.
>> >
>> > Do you have a simple example for checking the simple case of 2x
>> performance loss?
>> >
>> > Doru
>> >
>> >
>> > On Fri, Jan 30, 2015 at 12:28 PM, Usman Bhatti
<usman.bhatti(a)gmail.com>
>> wrote:
>> > Hi,
>> >
>> > Since the work on the integration of PPContext in PetitParser, there
>> is significant performance degradation. I have already mentioned that on
>> simple grammar the factor is about 2. But on complex grammar (for example,
>> our proprietary parser for 4D language ), we have seen that degradation is
>> goes well beyond this factor. So, for example, for 800K lines that we parse
>> in under 10 minutes without PPContext work, with the latest version it goes
>> beyond 2h.
>> >
>> > I have not been able to reproduce my case on simple grammars. May be
>> we can have some benchmarks using open source parsers and large code bases
>> (e.g. PP Java Parser on JHotDraw or ArgoUML).
>> >
>> > Currently, I circumvent this issue by using PP v1.51 but I can provide
>> relevant feedback and run benches on any improvements.
>> >
>> > regards.
>> >
>> > Usman
>> >
>> > _______________________________________________
>> > Moose-dev mailing list
>> > Moose-dev(a)iam.unibe.ch
>> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>> >
>> >
>> >
>> >
>> > --
>> > www.tudorgirba.com
>> >
>> > "Every thing has its own flow"
>> >
>> > _______________________________________________
>> > Moose-dev mailing list
>> > Moose-dev(a)iam.unibe.ch
>> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>> >
>> >
>> > <script-graph.txt>_______________________________________________
>> > Moose-dev mailing list
>> > Moose-dev(a)iam.unibe.ch
>> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>
>>
>> _______________________________________________
>> Moose-dev mailing list
>> Moose-dev(a)iam.unibe.ch
>> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>
>
>
> _______________________________________________
> Moose-dev mailing list
> Moose-dev(a)iam.unibe.ch
> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>
>
9:09 a.m.
Great news.
@Usman: could you check?
Doru
On Fri, Feb 20, 2015 at 9:04 AM, Jan Kurš <kurs.jan(a)gmail.com> wrote:
Hey all, Please note that a new version in of PetitParser
(JanKurs-271)
should improve performance roughly comparable to the original performance.
On my computer, I got improvement from 3900ms to 1300ms.
Cheers,
Jan
On 1 February 2015 at 22:55, Jan Kurš <kurs.jan(a)gmail.com> wrote:
> Hey all, thanks for the report, I will have a look at it asap.
>
> Cheers Jan
> On 1 Feb 2015 20:55, "Usman Bhatti" <usman.bhatti(a)gmail.com> wrote:
>
>>
>>
>> On Fri, Jan 30, 2015 at 9:36 PM, Sven Van Caekenberghe <sven(a)stfx.eu>
>> wrote:
>>
>>> Usman, this is a really cool bug report !
>>>
>>
>> Thanks :)
>>
>>
>>>
>>> > On 30 Jan 2015, at 16:36, Usman Bhatti <usman.bhatti(a)gmail.com>
>>> wrote:
>>> >
>>> > Here is a script that shows the factor of 2 in time taken for
>>> parsing. The idea of the script is to introduce several wrong branches
>>> before hitting the correct one (originally proposed by Guillaume).
>>> >
>>> > |rule wrongBranches|
>>> > [wrongBranches := (25 to: 45) inject: 24 asCharacter asParser into:
>>> [:acc :each | acc / each asCharacter asParser].
>>> > rule := PPDelegateParser new.
>>> > rule setParser: $a asParser / ((wrongBranches / $. asParser), rule).
>>> > rule parse: (String streamContents: [ :s |
>>> > 30000 timesRepeat: [s nextPut: $.]. s nextPut: $a ])] timeToRun
>>> >
>>> >
>>> > Below are the graphs that were generated when varying the string
>>> length provided to the above parser description. Green part shows the time
>>> taken by the older version and the red part with the latest PP.
>>> >
>>> > <graph.png>
>>> >
>>> > Data values and graph generated by the script in the attached file.
>>> >
>>> > regards.
>>> >
>>> > usman
>>> >
>>> > On Fri, Jan 30, 2015 at 1:30 PM, Tudor Girba
<tudor(a)tudorgirba.com>
>>> wrote:
>>> > Hi,
>>> >
>>> > Hmm. I thought this was fixed and that you said at the end that the
>>> performance penalty is no longer a factor of 2.
>>> >
>>> > Do you have a simple example for checking the simple case of 2x
>>> performance loss?
>>> >
>>> > Doru
>>> >
>>> >
>>> > On Fri, Jan 30, 2015 at 12:28 PM, Usman Bhatti <
>>> usman.bhatti(a)gmail.com> wrote:
>>> > Hi,
>>> >
>>> > Since the work on the integration of PPContext in PetitParser, there
>>> is significant performance degradation. I have already mentioned that on
>>> simple grammar the factor is about 2. But on complex grammar (for example,
>>> our proprietary parser for 4D language ), we have seen that degradation is
>>> goes well beyond this factor. So, for example, for 800K lines that we parse
>>> in under 10 minutes without PPContext work, with the latest version it goes
>>> beyond 2h.
>>> >
>>> > I have not been able to reproduce my case on simple grammars. May be
>>> we can have some benchmarks using open source parsers and large code bases
>>> (e.g. PP Java Parser on JHotDraw or ArgoUML).
>>> >
>>> > Currently, I circumvent this issue by using PP v1.51 but I can
>>> provide relevant feedback and run benches on any improvements.
>>> >
>>> > regards.
>>> >
>>> > Usman
>>> >
>>> > _______________________________________________
>>> > Moose-dev mailing list
>>> > Moose-dev(a)iam.unibe.ch
>>> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>> >
>>> >
>>> >
>>> >
>>> > --
>>> > www.tudorgirba.com
>>> >
>>> > "Every thing has its own flow"
>>> >
>>> > _______________________________________________
>>> > Moose-dev mailing list
>>> > Moose-dev(a)iam.unibe.ch
>>> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>> >
>>> >
>>> > <script-graph.txt>_______________________________________________
>>> > Moose-dev mailing list
>>> > Moose-dev(a)iam.unibe.ch
>>> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>>
>>>
>>> _______________________________________________
>>> Moose-dev mailing list
>>> Moose-dev(a)iam.unibe.ch
>>> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>>
>>
>>
>> _______________________________________________
>> Moose-dev mailing list
>> Moose-dev(a)iam.unibe.ch
>> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>
>>
_______________________________________________
Moose-dev mailing list
Moose-dev(a)iam.unibe.ch
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
--
www.tudorgirba.com
"Every thing has its own flow"
5:47 p.m.
I executed the script that I shared earlier in this thread and I see a
considerable performance improvement in the latest version of PP. The
attached chart shows the comparison chart between PP v 1.51 (green) with
the newer version (red). For shorter strings (i.e. to the left on x-axis),
the execution time is almost comparable to the previous version of
PetitParser that dates before changes introduced by Jan.
However, when I take the new version and parse the code source of larger
code bases, the execution time still get a hit. For example, parsing 100K
lines takes almost twice longer. The increase is exponential with even
larger ones. That is consistent with results we see in the graph (the
larger the chain to be parsed i.e. going from left to right in the x-axis,
the higher the performance penalty). Meaning I still prefer the older
version.
What will be good is to prepare some benches with Java Parser in PP, as it
is open source, and a set of programs (e.g. ArguUML) that can serve as a
standard to test execution time for PP that we can run as a jenkins service.
[image: Inline image 1]
regards.
On Fri, Feb 20, 2015 at 9:09 AM, Tudor Girba <tudor(a)tudorgirba.com> wrote:
Great news.
@Usman: could you check?
Doru
On Fri, Feb 20, 2015 at 9:04 AM, Jan Kurš <kurs.jan(a)gmail.com> wrote:
> Hey all, Please note that a new version in of PetitParser (JanKurs-271)
> should improve performance roughly comparable to the original performance.
> On my computer, I got improvement from 3900ms to 1300ms.
>
>
> Cheers,
> Jan
>
> On 1 February 2015 at 22:55, Jan Kurš <kurs.jan(a)gmail.com> wrote:
>
>> Hey all, thanks for the report, I will have a look at it asap.
>>
>> Cheers Jan
>> On 1 Feb 2015 20:55, "Usman Bhatti" <usman.bhatti(a)gmail.com>
wrote:
>>
>>>
>>>
>>> On Fri, Jan 30, 2015 at 9:36 PM, Sven Van Caekenberghe <sven(a)stfx.eu>
>>> wrote:
>>>
>>>> Usman, this is a really cool bug report !
>>>>
>>>
>>> Thanks :)
>>>
>>>
>>>>
>>>> > On 30 Jan 2015, at 16:36, Usman Bhatti
<usman.bhatti(a)gmail.com>
>>>> wrote:
>>>> >
>>>> > Here is a script that shows the factor of 2 in time taken for
>>>> parsing. The idea of the script is to introduce several wrong branches
>>>> before hitting the correct one (originally proposed by Guillaume).
>>>> >
>>>> > |rule wrongBranches|
>>>> > [wrongBranches := (25 to: 45) inject: 24 asCharacter asParser into:
>>>> [:acc :each | acc / each asCharacter asParser].
>>>> > rule := PPDelegateParser new.
>>>> > rule setParser: $a asParser / ((wrongBranches / $. asParser),
rule).
>>>> > rule parse: (String streamContents: [ :s |
>>>> > 30000 timesRepeat: [s nextPut: $.]. s nextPut: $a ])]
timeToRun
>>>> >
>>>> >
>>>> > Below are the graphs that were generated when varying the string
>>>> length provided to the above parser description. Green part shows the
time
>>>> taken by the older version and the red part with the latest PP.
>>>> >
>>>> > <graph.png>
>>>> >
>>>> > Data values and graph generated by the script in the attached file.
>>>> >
>>>> > regards.
>>>> >
>>>> > usman
>>>> >
>>>> > On Fri, Jan 30, 2015 at 1:30 PM, Tudor Girba
<tudor(a)tudorgirba.com>
>>>> wrote:
>>>> > Hi,
>>>> >
>>>> > Hmm. I thought this was fixed and that you said at the end that the
>>>> performance penalty is no longer a factor of 2.
>>>> >
>>>> > Do you have a simple example for checking the simple case of 2x
>>>> performance loss?
>>>> >
>>>> > Doru
>>>> >
>>>> >
>>>> > On Fri, Jan 30, 2015 at 12:28 PM, Usman Bhatti <
>>>> usman.bhatti(a)gmail.com> wrote:
>>>> > Hi,
>>>> >
>>>> > Since the work on the integration of PPContext in PetitParser,
there
>>>> is significant performance degradation. I have already mentioned that on
>>>> simple grammar the factor is about 2. But on complex grammar (for
example,
>>>> our proprietary parser for 4D language ), we have seen that degradation
is
>>>> goes well beyond this factor. So, for example, for 800K lines that we
parse
>>>> in under 10 minutes without PPContext work, with the latest version it
goes
>>>> beyond 2h.
>>>> >
>>>> > I have not been able to reproduce my case on simple grammars. May
be
>>>> we can have some benchmarks using open source parsers and large code
bases
>>>> (e.g. PP Java Parser on JHotDraw or ArgoUML).
>>>> >
>>>> > Currently, I circumvent this issue by using PP v1.51 but I can
>>>> provide relevant feedback and run benches on any improvements.
>>>> >
>>>> > regards.
>>>> >
>>>> > Usman
>>>> >
>>>> > _______________________________________________
>>>> > Moose-dev mailing list
>>>> > Moose-dev(a)iam.unibe.ch
>>>> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>>> >
>>>> >
>>>> >
>>>> >
>>>> > --
>>>> > www.tudorgirba.com
>>>> >
>>>> > "Every thing has its own flow"
>>>> >
>>>> > _______________________________________________
>>>> > Moose-dev mailing list
>>>> > Moose-dev(a)iam.unibe.ch
>>>> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>>> >
>>>> >
>>>> >
<script-graph.txt>_______________________________________________
>>>> > Moose-dev mailing list
>>>> > Moose-dev(a)iam.unibe.ch
>>>> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>>>
>>>>
>>>> _______________________________________________
>>>> Moose-dev mailing list
>>>> Moose-dev(a)iam.unibe.ch
>>>> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>>>
>>>
>>>
>>> _______________________________________________
>>> Moose-dev mailing list
>>> Moose-dev(a)iam.unibe.ch
>>> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>>
>>>
>
> _______________________________________________
> Moose-dev mailing list
> Moose-dev(a)iam.unibe.ch
> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>
>
--
www.tudorgirba.com
"Every thing has its own flow"
_______________________________________________
Moose-dev mailing list
Moose-dev(a)iam.unibe.ch
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
11:14 a.m.
Hey,
I was not aware about some exponential element in the overall complexity,
it is strange and I will investigate it. Thank you Usman, for pointing this
out.
In general, it is hard to add features into the PetitParser and preserve
performance. Therefore, we work on a tool, that will take PetitParser,
analyze it and generates faster parser. The idea is to use PetitParser
while developing the grammar and than generate a fast parser for "real"
use. We hope we will be present the tool during the next ESUG.
Cheers,
Jan
On 20 February 2015 at 17:47, Usman Bhatti <usman.bhatti(a)gmail.com> wrote:
I executed the script that I shared earlier in this thread and I see
a
considerable performance improvement in the latest version of PP. The
attached chart shows the comparison chart between PP v 1.51 (green) with
the newer version (red). For shorter strings (i.e. to the left on x-axis),
the execution time is almost comparable to the previous version of
PetitParser that dates before changes introduced by Jan.
However, when I take the new version and parse the code source of larger
code bases, the execution time still get a hit. For example, parsing 100K
lines takes almost twice longer. The increase is exponential with even
larger ones. That is consistent with results we see in the graph (the
larger the chain to be parsed i.e. going from left to right in the x-axis,
the higher the performance penalty). Meaning I still prefer the older
version.
What will be good is to prepare some benches with Java Parser in PP, as it
is open source, and a set of programs (e.g. ArguUML) that can serve as a
standard to test execution time for PP that we can run as a jenkins service.
[image: Inline image 1]
regards.
On Fri, Feb 20, 2015 at 9:09 AM, Tudor Girba <tudor(a)tudorgirba.com> wrote:
> Great news.
>
> @Usman: could you check?
>
> Doru
>
> On Fri, Feb 20, 2015 at 9:04 AM, Jan Kurš <kurs.jan(a)gmail.com> wrote:
>
>> Hey all, Please note that a new version in of PetitParser (JanKurs-271)
>> should improve performance roughly comparable to the original performance.
>> On my computer, I got improvement from 3900ms to 1300ms.
>>
>>
>> Cheers,
>> Jan
>>
>> On 1 February 2015 at 22:55, Jan Kurš <kurs.jan(a)gmail.com> wrote:
>>
>>> Hey all, thanks for the report, I will have a look at it asap.
>>>
>>> Cheers Jan
>>> On 1 Feb 2015 20:55, "Usman Bhatti" <usman.bhatti(a)gmail.com>
wrote:
>>>
>>>>
>>>>
>>>> On Fri, Jan 30, 2015 at 9:36 PM, Sven Van Caekenberghe
<sven(a)stfx.eu>
>>>> wrote:
>>>>
>>>>> Usman, this is a really cool bug report !
>>>>>
>>>>
>>>> Thanks :)
>>>>
>>>>
>>>>>
>>>>> > On 30 Jan 2015, at 16:36, Usman Bhatti
<usman.bhatti(a)gmail.com>
>>>>> wrote:
>>>>> >
>>>>> > Here is a script that shows the factor of 2 in time taken for
>>>>> parsing. The idea of the script is to introduce several wrong
branches
>>>>> before hitting the correct one (originally proposed by Guillaume).
>>>>> >
>>>>> > |rule wrongBranches|
>>>>> > [wrongBranches := (25 to: 45) inject: 24 asCharacter asParser
into:
>>>>> [:acc :each | acc / each asCharacter asParser].
>>>>> > rule := PPDelegateParser new.
>>>>> > rule setParser: $a asParser / ((wrongBranches / $. asParser),
rule).
>>>>> > rule parse: (String streamContents: [ :s |
>>>>> > 30000 timesRepeat: [s nextPut: $.]. s nextPut: $a ])]
>>>>> timeToRun
>>>>> >
>>>>> >
>>>>> > Below are the graphs that were generated when varying the
string
>>>>> length provided to the above parser description. Green part shows the
time
>>>>> taken by the older version and the red part with the latest PP.
>>>>> >
>>>>> > <graph.png>
>>>>> >
>>>>> > Data values and graph generated by the script in the attached
file.
>>>>> >
>>>>> > regards.
>>>>> >
>>>>> > usman
>>>>> >
>>>>> > On Fri, Jan 30, 2015 at 1:30 PM, Tudor Girba
<tudor(a)tudorgirba.com>
>>>>> wrote:
>>>>> > Hi,
>>>>> >
>>>>> > Hmm. I thought this was fixed and that you said at the end that
the
>>>>> performance penalty is no longer a factor of 2.
>>>>> >
>>>>> > Do you have a simple example for checking the simple case of 2x
>>>>> performance loss?
>>>>> >
>>>>> > Doru
>>>>> >
>>>>> >
>>>>> > On Fri, Jan 30, 2015 at 12:28 PM, Usman Bhatti <
>>>>> usman.bhatti(a)gmail.com> wrote:
>>>>> > Hi,
>>>>> >
>>>>> > Since the work on the integration of PPContext in PetitParser,
>>>>> there is significant performance degradation. I have already
mentioned that
>>>>> on simple grammar the factor is about 2. But on complex grammar (for
>>>>> example, our proprietary parser for 4D language ), we have seen that
>>>>> degradation is goes well beyond this factor. So, for example, for
800K
>>>>> lines that we parse in under 10 minutes without PPContext work, with
the
>>>>> latest version it goes beyond 2h.
>>>>> >
>>>>> > I have not been able to reproduce my case on simple grammars.
May
>>>>> be we can have some benchmarks using open source parsers and large
code
>>>>> bases (e.g. PP Java Parser on JHotDraw or ArgoUML).
>>>>> >
>>>>> > Currently, I circumvent this issue by using PP v1.51 but I can
>>>>> provide relevant feedback and run benches on any improvements.
>>>>> >
>>>>> > regards.
>>>>> >
>>>>> > Usman
>>>>> >
>>>>> > _______________________________________________
>>>>> > Moose-dev mailing list
>>>>> > Moose-dev(a)iam.unibe.ch
>>>>> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>>>> >
>>>>> >
>>>>> >
>>>>> >
>>>>> > --
>>>>> > www.tudorgirba.com
>>>>> >
>>>>> > "Every thing has its own flow"
>>>>> >
>>>>> > _______________________________________________
>>>>> > Moose-dev mailing list
>>>>> > Moose-dev(a)iam.unibe.ch
>>>>> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>>>> >
>>>>> >
>>>>> >
<script-graph.txt>_______________________________________________
>>>>> > Moose-dev mailing list
>>>>> > Moose-dev(a)iam.unibe.ch
>>>>> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Moose-dev mailing list
>>>>> Moose-dev(a)iam.unibe.ch
>>>>> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Moose-dev mailing list
>>>> Moose-dev(a)iam.unibe.ch
>>>> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>>>
>>>>
>>
>> _______________________________________________
>> Moose-dev mailing list
>> Moose-dev(a)iam.unibe.ch
>> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>
>>
>
>
> --
> www.tudorgirba.com
>
> "Every thing has its own flow"
>
> _______________________________________________
> Moose-dev mailing list
> Moose-dev(a)iam.unibe.ch
> https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>
>
_______________________________________________
Moose-dev mailing list
Moose-dev(a)iam.unibe.ch
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
8:07 p.m.
Le 21/02/2015 11:14, Jan Kurš a écrit :
Hey,
I was not aware about some exponential element in the overall
complexity, it is strange and I will investigate it. Thank you Usman,
for pointing this out.
In general, it is hard to add features into the PetitParser and preserve
performance. Therefore, we work on a tool, that will take PetitParser,
analyze it and generates faster parser. The idea is to use PetitParser
while developing the grammar and than generate a fast parser for "real"
use. We hope we will be present the tool during the next ESUG.
I certainly be interested with what you come up with. From profiling
PetitParser, it seems there is at least one low-hanging fruit in term of
performance.
And thanks too Usman, for pointing out long source code files may (or
do) show diverging asymptotic behaviors. And real life use for most
programming languages are very long files :(
Thierry
Cheers,
Jan
On 20 February 2015 at 17:47, Usman Bhatti <usman.bhatti(a)gmail.com
<mailto:usman.bhatti@gmail.com>> wrote:
I executed the script that I shared earlier in this thread and I see
a considerable performance improvement in the latest version of
PP. The attached chart shows the comparison chart between PP v 1.51
(green) with the newer version (red). For shorter strings (i.e. to
the left on x-axis), the execution time is almost comparable to the
previous version of PetitParser that dates before changes introduced
by Jan.
However, when I take the new version and parse the code source of
larger code bases, the execution time still get a hit. For example,
parsing 100K lines takes almost twice longer. The increase is
exponential with even larger ones. That is consistent with results
we see in the graph (the larger the chain to be parsed i.e. going
from left to right in the x-axis, the higher the performance
penalty). Meaning I still prefer the older version.
What will be good is to prepare some benches with Java Parser in PP,
as it is open source, and a set of programs (e.g. ArguUML) that can
serve as a standard to test execution time for PP that we can run as
a jenkins service.
Inline image 1
regards.
On Fri, Feb 20, 2015 at 9:09 AM, Tudor Girba <tudor(a)tudorgirba.com
<mailto:tudor@tudorgirba.com>> wrote:
Great news.
@Usman: could you check?
Doru
On Fri, Feb 20, 2015 at 9:04 AM, Jan Kurš <kurs.jan(a)gmail.com
<mailto:kurs.jan@gmail.com>> wrote:
Hey all, Please note that a new version in of PetitParser
(JanKurs-271) should improve performance roughly comparable
to the original performance. On my computer, I got
improvement from 3900ms to 1300ms.
Cheers,
Jan
On 1 February 2015 at 22:55, Jan Kurš <kurs.jan(a)gmail.com
<mailto:kurs.jan@gmail.com>> wrote:
Hey all, thanks for the report, I will have a look at it
asap.
Cheers Jan
On 1 Feb 2015 20:55, "Usman Bhatti"
<usman.bhatti(a)gmail.com <mailto:usman.bhatti@gmail.com>>
wrote:
On Fri, Jan 30, 2015 at 9:36 PM, Sven Van
Caekenberghe <sven(a)stfx.eu <mailto:sven@stfx.eu>> wrote:
Usman, this is a really cool bug report !
Thanks :)
> On 30 Jan 2015, at 16:36, Usman Bhatti
<usman.bhatti(a)gmail.com
<mailto:usman.bhatti@gmail.com>> wrote:
>
> Here is a script that shows the factor of 2 in time taken
for parsing. The idea of the script is to introduce several wrong branches before hitting
the correct one (originally proposed by Guillaume).
>
> |rule wrongBranches|
> [wrongBranches := (25 to: 45) inject: 24 asCharacter
asParser into: [:acc :each | acc / each asCharacter asParser].
> rule := PPDelegateParser new.
> rule setParser: $a asParser / ((wrongBranches / $.
asParser), rule).
> rule parse: (String streamContents: [ :s |
> 30000 timesRepeat: [s nextPut: $.]. s nextPut: $a ])]
timeToRun
>
>
> Below are the graphs that were generated when varying the
string length provided to the above parser description. Green part shows the time taken by
the older version and the red part with the latest PP.
>
> <graph.png>
>
> Data values and graph generated by the script
in the attached file.
>
> regards.
>
> usman
>
> On Fri, Jan 30, 2015 at 1:30 PM, Tudor Girba
<tudor(a)tudorgirba.com
<mailto:tudor@tudorgirba.com>> wrote:
> Hi,
>
> Hmm. I thought this was fixed and that you
said at the end that the performance penalty is
no longer a factor of 2.
>
> Do you have a simple example for checking the
simple case of 2x performance loss?
>
> Doru
>
>
> On Fri, Jan 30, 2015 at 12:28 PM, Usman
Bhatti <usman.bhatti(a)gmail.com
<mailto:usman.bhatti@gmail.com>> wrote:
> Hi,
>
> Since the work on the integration of
PPContext in PetitParser, there is significant
performance degradation. I have already
mentioned that on simple grammar the factor is
about 2. But on complex grammar (for example,
our proprietary parser for 4D language ), we
have seen that degradation is goes well beyond
this factor. So, for example, for 800K lines
that we parse in under 10 minutes without
PPContext work, with the latest version it goes
beyond 2h.
>
> I have not been able to reproduce my case on
simple grammars. May be we can have some
benchmarks using open source parsers and large
code bases (e.g. PP Java Parser on JHotDraw or
ArgoUML).
>
> Currently, I circumvent this issue by using
PP v1.51 but I can provide relevant feedback and
run benches on any improvements.
>
> regards.
>
> Usman
>
> _______________________________________________
> Moose-dev mailing list
> Moose-dev(a)iam.unibe.ch
<mailto:Moose-dev@iam.unibe.ch>
>
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>
>
>
>
> --
> www.tudorgirba.com <http://www.tudorgirba.com>
>
> "Every thing has its own flow"
>
> _______________________________________________
> Moose-dev mailing list
> Moose-dev(a)iam.unibe.ch
<mailto:Moose-dev@iam.unibe.ch>
>
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>
>
>
<script-graph.txt>_______________________________________________
> Moose-dev mailing list
> Moose-dev(a)iam.unibe.ch
<mailto:Moose-dev@iam.unibe.ch>
>
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
_______________________________________________
Moose-dev mailing list
Moose-dev(a)iam.unibe.ch
<mailto:Moose-dev@iam.unibe.ch>
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
_______________________________________________
Moose-dev mailing list
Moose-dev(a)iam.unibe.ch <mailto:Moose-dev@iam.unibe.ch>
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
_______________________________________________
Moose-dev mailing list
Moose-dev(a)iam.unibe.ch <mailto:Moose-dev@iam.unibe.ch>
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
--
www.tudorgirba.com <http://www.tudorgirba.com>
"Every thing has its own flow"
_______________________________________________
Moose-dev mailing list
Moose-dev(a)iam.unibe.ch <mailto:Moose-dev@iam.unibe.ch>
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
_______________________________________________
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_______________________________________________
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9:13 p.m.
Hi,
On Sat, Feb 21, 2015 at 8:07 PM, Thierry Goubier <thierry.goubier(a)gmail.com>
wrote:
Le 21/02/2015 11:14, Jan Kurš a écrit :
> Hey,
>
> I was not aware about some exponential element in the overall
> complexity, it is strange and I will investigate it. Thank you Usman,
> for pointing this out.
>
> In general, it is hard to add features into the PetitParser and preserve
> performance. Therefore, we work on a tool, that will take PetitParser,
> analyze it and generates faster parser. The idea is to use PetitParser
> while developing the grammar and than generate a fast parser for "real"
> use. We hope we will be present the tool during the next ESUG.
>
I certainly be interested with what you come up with. From profiling
PetitParser, it seems there is at least one low-hanging fruit in term of
performance.
What is that log hanging fruit?
Doru
And thanks too Usman, for pointing out long source code files may (or
do)
show diverging asymptotic behaviors. And real life use for most programming
languages are very long files :(
Thierry
> Cheers,
> Jan
>
> On 20 February 2015 at 17:47, Usman Bhatti <usman.bhatti(a)gmail.com
> <mailto:usman.bhatti@gmail.com>> wrote:
>
> I executed the script that I shared earlier in this thread and I see
> a considerable performance improvement in the latest version of
> PP. The attached chart shows the comparison chart between PP v 1.51
> (green) with the newer version (red). For shorter strings (i.e. to
> the left on x-axis), the execution time is almost comparable to the
> previous version of PetitParser that dates before changes introduced
> by Jan.
>
> However, when I take the new version and parse the code source of
> larger code bases, the execution time still get a hit. For example,
> parsing 100K lines takes almost twice longer. The increase is
> exponential with even larger ones. That is consistent with results
> we see in the graph (the larger the chain to be parsed i.e. going
> from left to right in the x-axis, the higher the performance
> penalty). Meaning I still prefer the older version.
>
> What will be good is to prepare some benches with Java Parser in PP,
> as it is open source, and a set of programs (e.g. ArguUML) that can
> serve as a standard to test execution time for PP that we can run as
> a jenkins service.
>
>
> Inline image 1
>
> regards.
>
> On Fri, Feb 20, 2015 at 9:09 AM, Tudor Girba <tudor(a)tudorgirba.com
> <mailto:tudor@tudorgirba.com>> wrote:
>
> Great news.
>
> @Usman: could you check?
>
> Doru
>
> On Fri, Feb 20, 2015 at 9:04 AM, Jan Kurš <kurs.jan(a)gmail.com
> <mailto:kurs.jan@gmail.com>> wrote:
>
> Hey all, Please note that a new version in of PetitParser
> (JanKurs-271) should improve performance roughly comparable
> to the original performance. On my computer, I got
> improvement from 3900ms to 1300ms.
>
>
> Cheers,
> Jan
>
> On 1 February 2015 at 22:55, Jan Kurš <kurs.jan(a)gmail.com
> <mailto:kurs.jan@gmail.com>> wrote:
>
> Hey all, thanks for the report, I will have a look at it
> asap.
>
> Cheers Jan
>
> On 1 Feb 2015 20:55, "Usman Bhatti"
> <usman.bhatti(a)gmail.com <mailto:usman.bhatti@gmail.com>>
> wrote:
>
>
>
> On Fri, Jan 30, 2015 at 9:36 PM, Sven Van
> Caekenberghe <sven(a)stfx.eu <mailto:sven@stfx.eu>>
> wrote:
>
> Usman, this is a really cool bug report !
>
>
> Thanks :)
>
>
> > On 30 Jan 2015, at 16:36, Usman Bhatti <
> usman.bhatti(a)gmail.com
> <mailto:usman.bhatti@gmail.com>> wrote:
> >
> > Here is a script that shows the factor of 2 in
> time taken for parsing. The idea of the script is to introduce several
> wrong branches before hitting the correct one (originally proposed by
> Guillaume).
> >
> > |rule wrongBranches|
> > [wrongBranches := (25 to: 45) inject: 24
> asCharacter asParser into: [:acc :each | acc / each asCharacter asParser].
> > rule := PPDelegateParser new.
> > rule setParser: $a asParser / ((wrongBranches /
> $. asParser), rule).
> > rule parse: (String streamContents: [ :s |
> > 30000 timesRepeat: [s nextPut: $.]. s
> nextPut: $a ])] timeToRun
> >
> >
> > Below are the graphs that were generated when
> varying the string length provided to the above parser description. Green
> part shows the time taken by the older version and the red part with the
> latest PP.
> >
> > <graph.png>
> >
> > Data values and graph generated by the script
> in the attached file.
> >
> > regards.
> >
> > usman
> >
> > On Fri, Jan 30, 2015 at 1:30 PM, Tudor Girba
> <tudor(a)tudorgirba.com
> <mailto:tudor@tudorgirba.com>> wrote:
> > Hi,
> >
> > Hmm. I thought this was fixed and that you
> said at the end that the performance penalty is
> no longer a factor of 2.
> >
> > Do you have a simple example for checking the
> simple case of 2x performance loss?
> >
> > Doru
> >
> >
> > On Fri, Jan 30, 2015 at 12:28 PM, Usman
> Bhatti <usman.bhatti(a)gmail.com
> <mailto:usman.bhatti@gmail.com>> wrote:
> > Hi,
> >
> > Since the work on the integration of
> PPContext in PetitParser, there is significant
> performance degradation. I have already
> mentioned that on simple grammar the factor is
> about 2. But on complex grammar (for example,
> our proprietary parser for 4D language ), we
> have seen that degradation is goes well beyond
> this factor. So, for example, for 800K lines
> that we parse in under 10 minutes without
> PPContext work, with the latest version it goes
> beyond 2h.
> >
> > I have not been able to reproduce my case on
> simple grammars. May be we can have some
> benchmarks using open source parsers and large
> code bases (e.g. PP Java Parser on JHotDraw or
> ArgoUML).
> >
> > Currently, I circumvent this issue by using
> PP v1.51 but I can provide relevant feedback and
> run benches on any improvements.
> >
> > regards.
> >
> > Usman
> >
> > ______________________________
> _________________
> > Moose-dev mailing list
> > Moose-dev(a)iam.unibe.ch
> <mailto:Moose-dev@iam.unibe.ch>
> >
> https://www.iam.unibe.ch/
> mailman/listinfo/moose-dev
> >
> >
> >
> >
> > --
> > www.tudorgirba.com <http://www.tudorgirba.com>
> >
> > "Every thing has its own flow"
> >
> > ______________________________
> _________________
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"Every thing has its own flow"
10:03 p.m.
Hey,
I was not aware about some exponential element in the overall
complexity, it is strange and I will investigate it. Thank you Usman,
for pointing this out.
In general, it is hard to add features into the PetitParser and
preserve performance.
I imagine.
May be one idea would be also to have different flavors of PP.
Therefore, we work on a tool, that will take PetitParser, analyze it
and generates faster parser. The idea is to use PetitParser while
developing the grammar and than generate a fast parser for "real" use.
We hope we will be present the tool during the next ESUG.
That could be gorgeous.
If Synectique takes off for real (which I really hope), I'm sure that
Synectique will think hard about you as a synectiquer :).
Stef
Cheers,
Jan
On 20 February 2015 at 17:47, Usman Bhatti <usman.bhatti(a)gmail.com
<mailto:usman.bhatti@gmail.com>> wrote:
I executed the script that I shared earlier in this thread and I
see a considerable performance improvement in the latest version
of PP. The attached chart shows the comparison chart between PP v
1.51 (green) with the newer version (red). For shorter strings
(i.e. to the left on x-axis), the execution time is almost
comparable to the previous version of PetitParser that dates
before changes introduced by Jan.
However, when I take the new version and parse the code source of
larger code bases, the execution time still get a hit. For
example, parsing 100K lines takes almost twice longer. The
increase is exponential with even larger ones. That is consistent
with results we see in the graph (the larger the chain to be
parsed i.e. going from left to right in the x-axis, the higher the
performance penalty). Meaning I still prefer the older version.
What will be good is to prepare some benches with Java Parser in
PP, as it is open source, and a set of programs (e.g. ArguUML)
that can serve as a standard to test execution time for PP that we
can run as a jenkins service.
Inline image 1
regards.
On Fri, Feb 20, 2015 at 9:09 AM, Tudor Girba <tudor(a)tudorgirba.com
<mailto:tudor@tudorgirba.com>> wrote:
Great news.
@Usman: could you check?
Doru
On Fri, Feb 20, 2015 at 9:04 AM, Jan Kurš <kurs.jan(a)gmail.com
<mailto:kurs.jan@gmail.com>> wrote:
Hey all, Please note that a new version in of PetitParser
(JanKurs-271) should improve performance roughly
comparable to the original performance. On my computer, I
got improvement from 3900ms to 1300ms.
Cheers,
Jan
On 1 February 2015 at 22:55, Jan Kurš <kurs.jan(a)gmail.com
<mailto:kurs.jan@gmail.com>> wrote:
Hey all, thanks for the report, I will have a look at
it asap.
Cheers Jan
On 1 Feb 2015 20:55, "Usman Bhatti"
<usman.bhatti(a)gmail.com
<mailto:usman.bhatti@gmail.com>> wrote:
On Fri, Jan 30, 2015 at 9:36 PM, Sven Van
Caekenberghe <sven(a)stfx.eu <mailto:sven@stfx.eu>>
wrote:
Usman, this is a really cool bug report !
Thanks :)
> On 30 Jan 2015, at 16:36, Usman Bhatti
<usman.bhatti(a)gmail.com
<mailto:usman.bhatti@gmail.com>> wrote:
>
> Here is a script that shows the factor of 2
in time taken for parsing. The idea of the
script is to introduce several wrong branches
before hitting the correct one (originally
proposed by Guillaume).
>
> |rule wrongBranches|
> [wrongBranches := (25 to: 45) inject: 24
asCharacter asParser into: [:acc :each | acc /
each asCharacter asParser].
> rule := PPDelegateParser new.
> rule setParser: $a asParser /
((wrongBranches / $. asParser), rule).
> rule parse: (String streamContents: [ :s |
> 30000 timesRepeat: [s nextPut: $.]. s
nextPut: $a ])] timeToRun
>
>
> Below are the graphs that were generated
when varying the string length provided to the
above parser description. Green part shows the
time taken by the older version and the red
part with the latest PP.
>
> <graph.png>
>
> Data values and graph generated by the
script in the attached file.
>
> regards.
>
> usman
>
> On Fri, Jan 30, 2015 at 1:30 PM, Tudor Girba
<tudor(a)tudorgirba.com
<mailto:tudor@tudorgirba.com>> wrote:
> Hi,
>
> Hmm. I thought this was fixed and that you
said at the end that the performance penalty
is no longer a factor of 2.
>
> Do you have a simple example for checking
the simple case of 2x performance loss?
>
> Doru
>
>
> On Fri, Jan 30, 2015 at 12:28 PM, Usman
Bhatti <usman.bhatti(a)gmail.com
<mailto:usman.bhatti@gmail.com>> wrote:
> Hi,
>
> Since the work on the integration of
PPContext in PetitParser, there is significant
performance degradation. I have already
mentioned that on simple grammar the factor is
about 2. But on complex grammar (for example,
our proprietary parser for 4D language ), we
have seen that degradation is goes well beyond
this factor. So, for example, for 800K lines
that we parse in under 10 minutes without
PPContext work, with the latest version it
goes beyond 2h.
>
> I have not been able to reproduce my case on
simple grammars. May be we can have some
benchmarks using open source parsers and large
code bases (e.g. PP Java Parser on JHotDraw or
ArgoUML).
>
> Currently, I circumvent this issue by using
PP v1.51 but I can provide relevant feedback
and run benches on any improvements.
>
> regards.
>
> Usman
>
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11:03 p.m.
Hi Doru,
the low hanging fruit is the time needed to create a PP parser (time for
new).
I profiled PPSmalltalkParser over a bench used by Lucas Renggli a few
years ago, and PPSmalltalkParser spends half the time in "new" (and it
is a lot slower than it used to be).
Thierry
Le 21/02/2015 21:13, Tudor Girba a écrit :
Hi,
On Sat, Feb 21, 2015 at 8:07 PM, Thierry Goubier
<thierry.goubier(a)gmail.com <mailto:thierry.goubier@gmail.com>> wrote:
Le 21/02/2015 11:14, Jan Kurš a écrit :
Hey,
I was not aware about some exponential element in the overall
complexity, it is strange and I will investigate it. Thank you
Usman,
for pointing this out.
In general, it is hard to add features into the PetitParser and
preserve
performance. Therefore, we work on a tool, that will take
PetitParser,
analyze it and generates faster parser. The idea is to use
PetitParser
while developing the grammar and than generate a fast parser for
"real"
use. We hope we will be present the tool during the next ESUG.
I certainly be interested with what you come up with. From profiling
PetitParser, it seems there is at least one low-hanging fruit in
term of performance.
What is that log hanging fruit?
Doru
11:05 p.m.
Le 21/02/2015 22:04, stepharo a écrit :
>
> And thanks too Usman, for pointing out long source code files may (or
> do) show diverging asymptotic behaviors. And real life use for most
> programming languages are very long files :(
>
Like one method with 15 pages ? :)
Only 15 pages? I believe SmaCC can generate longuer methods than that :)
Thierry
11:18 p.m.
Hi,
On Sat, Feb 21, 2015 at 11:03 PM, Thierry Goubier <thierry.goubier(a)gmail.com
wrote:
Hi Doru,
the low hanging fruit is the time needed to create a PP parser (time for
new).
I still do not see the low hanging fruit. Do you have a concrete idea of
how to make it faster?
I profiled PPSmalltalkParser over a bench used by Lucas Renggli a
few
years ago, and PPSmalltalkParser spends half the time in "new" (and it is a
lot slower than it used to be).
What does "a lot slower" mean?
Doru
> Thierry
>
> Le 21/02/2015 21:13, Tudor Girba a écrit :
>
>> Hi,
>>
>> On Sat, Feb 21, 2015 at 8:07 PM, Thierry Goubier
>> <thierry.goubier(a)gmail.com <mailto:thierry.goubier@gmail.com> wrote:
>>
>> Le 21/02/2015 11:14, Jan Kurš a écrit :
>>
>> Hey,
>>
>> I was not aware about some exponential element in the overall
>> complexity, it is strange and I will investigate it. Thank you
>> Usman,
>> for pointing this out.
>>
>> In general, it is hard to add features into the PetitParser and
>> preserve
>> performance. Therefore, we work on a tool, that will take
>> PetitParser,
>> analyze it and generates faster parser. The idea is to use
>> PetitParser
>> while developing the grammar and than generate a fast parser for
>> "real"
>> use. We hope we will be present the tool during the next ESUG.
>>
>>
>> I certainly be interested with what you come up with. From profiling
>> PetitParser, it seems there is at least one low-hanging fruit in
>> term of performance.
>>
>>
>> What is that log hanging fruit?
>>
>> Doru
>>
>
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"Every thing has its own flow"
11:22 p.m.
> Therefore, we work on a tool, that will take PetitParser, analyze
it and generates faster parser. The idea is to use PetitParser while developing the
grammar and than generate a fast parser for "real" use. We hope we will be
present the tool during the next ESUG.
Oh yes that would be extremely cool! I would love to have faster parsing for Live Robot
Programming as it parses the program at every keystroke. Right now it’s not a real issue
but as robot code will get bigger I imagine that it will become so …
---> Save our in-boxes! http://emailcharter.org <---
Johan Fabry - http://pleiad.cl/~jfabry
PLEIAD lab - Computer Science Department (DCC) - University of Chile
11:24 p.m.
So the easy solution in ‘production use’ would be to create the parser once and then keep
hanging on to it? I would not say that this is really a PetitParser issue, but more how
the parser is used.
On Feb 21, 2015, at 19:03, Thierry Goubier
<thierry.goubier(a)gmail.com> wrote:
Hi Doru,
the low hanging fruit is the time needed to create a PP parser (time for new).
I profiled PPSmalltalkParser over a bench used by Lucas Renggli a few years ago, and
PPSmalltalkParser spends half the time in "new" (and it is a lot slower than it
used to be).
Thierry
---> Save our in-boxes! http://emailcharter.org <---
Johan Fabry - http://pleiad.cl/~jfabry
PLEIAD lab - Computer Science Department (DCC) - University of Chile
11:34 p.m.
Le 21/02/2015 23:24, Johan Fabry a écrit :
So the easy solution in ‘production use’ would be to create the
parser once and then keep hanging on to it? I would not say that this
is really a PetitParser issue, but more how the parser is used.
All other Smalltalk parsers are instantiated as many times as the
PetitParser one in this benchmark, and their instanciation time is
around 0 ms.
But, yes, I would think that one of the solution would be a
pre-instantiation of a PetitParser, and a final instantiation to create
an instance.
In a way, one could imagine writing SmaCC parsers in the same way that
PetitParser parsers are written... pre-instantiation being the part
where SmaCC generates and compile its parsers.
In this benchmark, this would cut parsing time by 2.
Thierry
11:35 p.m.
Yes. This is also the reason why PPCompositeParser caches the internal
parser objects.
Cheers,
Doru
On Sat, Feb 21, 2015 at 11:24 PM, Johan Fabry <jfabry(a)dcc.uchile.cl> wrote:
So the easy solution in ‘production use’ would be to create the parser
once and then keep hanging on to it? I would not say that this is really a
PetitParser issue, but more how the parser is used.
> On Feb 21, 2015, at 19:03, Thierry Goubier <thierry.goubier(a)gmail.com>
wrote:
>
> Hi Doru,
>
> the low hanging fruit is the time needed to create a PP parser (time for
new).
>
> I profiled PPSmalltalkParser over a bench used by Lucas Renggli a few
years ago, and PPSmalltalkParser spends half the time in "new" (and it is a
lot slower than it used to be).
>
> Thierry
---> Save our in-boxes! http://emailcharter.org <---
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PLEIAD lab - Computer Science Department (DCC) - University of Chile
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11:46 p.m.
Le 21/02/2015 23:18, Tudor Girba a écrit :
Hi,
On Sat, Feb 21, 2015 at 11:03 PM, Thierry Goubier
<thierry.goubier(a)gmail.com <mailto:thierry.goubier@gmail.com>> wrote:
Hi Doru,
the low hanging fruit is the time needed to create a PP parser (time
for new).
I still do not see the low hanging fruit. Do you have a concrete idea of
how to make it faster?
Look at that instantiation code, cache the result.
- Make a copy when you instantiate.
- Recreate / recompute if you execute a method extending the parser on
the resulting object.
- Have a copy parser method which cleanly creates a new instance.
(i.e. summarized as: new should memoize and make a copy of the memoized
version)
Or look into reflection for making some methods trigger code generation,
as if parser combinators were written in pragmas :)
I profiled PPSmalltalkParser over a bench used by Lucas Renggli a
few years ago, and PPSmalltalkParser spends half the time in "new"
(and it is a lot slower than it used to be).
What does "a lot slower" mean?
3 times slower in Pharo 4.
And this benchmark does not show any effect linked to long files; it's
only a list of fairly short methods (all Object and Morph methods).
Thierry
11:32 a.m.
Hi,
On Sat, Feb 21, 2015 at 11:46 PM, Thierry Goubier <thierry.goubier(a)gmail.com
wrote:
> Le 21/02/2015 23:18, Tudor Girba a écrit :
>
>> Hi,
>>
>> On Sat, Feb 21, 2015 at 11:03 PM, Thierry Goubier
>> <thierry.goubier(a)gmail.com <mailto:thierry.goubier@gmail.com> wrote:
>>
>> Hi Doru,
>>
>> the low hanging fruit is the time needed to create a PP parser (time
>> for new).
>>
>>
>> I still do not see the low hanging fruit. Do you have a concrete idea of
>> how to make it faster?
>>
>
> Look at that instantiation code, cache the result.
> - Make a copy when you instantiate.
> - Recreate / recompute if you execute a method extending the parser on the
> resulting object.
> - Have a copy parser method which cleanly creates a new instance.
>
> (i.e. summarized as: new should memoize and make a copy of the memoized
> version)
>
This would go against the understood meaning of new which should return a
new instance, not a cached one.
Or look into reflection for making some methods trigger code generation, as
if parser combinators were written in pragmas :)
I do not understand.
> I profiled PPSmalltalkParser over a bench used by Lucas
Renggli a
> few years ago, and PPSmalltalkParser spends half the time in "new"
> (and it is a lot slower than it used to be).
>
>
> What does "a lot slower" mean?
>
3 times slower in Pharo 4.
And this benchmark does not show any effect linked to long files; it's only
a list of fairly short methods (all Object and Morph methods).
3 times slower comparing what to what? :) Is this the benchmark comparing a
hand-written parser with the PPSmalltalkParser? If yes, where can we see it
the code? If the benchmark is calling new multiple times, it is not
particularly relevant.
Cheers,
Doru
--
www.tudorgirba.com
"Every thing has its own flow"
12:10 p.m.
Le 22/02/2015 11:32, Tudor Girba a écrit :
Hi,
On Sat, Feb 21, 2015 at 11:46 PM, Thierry Goubier
<thierry.goubier(a)gmail.com <mailto:thierry.goubier@gmail.com>> wrote:
Le 21/02/2015 23:18, Tudor Girba a écrit :
Hi,
On Sat, Feb 21, 2015 at 11:03 PM, Thierry Goubier
<thierry.goubier(a)gmail.com <mailto:thierry.goubier@gmail.com>
<mailto:thierry.goubier@gmail.__com
<mailto:thierry.goubier@gmail.com>>> wrote:
Hi Doru,
the low hanging fruit is the time needed to create a PP
parser (time
for new).
I still do not see the low hanging fruit. Do you have a concrete
idea of
how to make it faster?
Look at that instantiation code, cache the result.
- Make a copy when you instantiate.
- Recreate / recompute if you execute a method extending the parser
on the resulting object.
- Have a copy parser method which cleanly creates a new instance.
(i.e. summarized as: new should memoize and make a copy of the
memoized version)
This would go against the understood meaning of new which should return
a new instance, not a cached one.
new would clone a pre-existing instance. Just the Self way.
Ok, it's cheating a bit, but it could work (hypothesis: making a copy of
a PP parser instance isn't expensive)
Or look into reflection for making some methods trigger code
generation, as if parser combinators were written in pragmas :)
I do not understand.
Well, one of the way to look at PetitParser is that it provides an
object-oriented API to the creation of grammars. So, I could very well
write an SmaCC layer which would allow a PetitParser parser design to
generate a Grammar (and maybe keep some of the semantic actions, but
probably not all).
This would be some of the same ideas.
When one writes a method like:
array
^ ${ asParser smalltalkToken , (expression delimitedBy: periodToken)
optional , $} asParser smalltalkToken
One in truth describe two things: a declarative way of writing a grammar
production which in SmaCC would be :
array: "{" (expression ".")* "}" ;
(approximately)
And a resolution (i.e. the code to execute the parse) as well.
One of the idea would be to execute and generate the declarative part of
the method above, so that, when you instantiate the parser, not much is
left to do.
3 times slower in Pharo 4.
And this benchmark does not show any effect linked to long files;
it's only a list of fairly short methods (all Object and Morph methods).
3 times slower comparing what to what? :) Is this the benchmark
comparing a hand-written parser with the PPSmalltalkParser? If yes,
where can we see it the code? If the benchmark is calling new multiple
times, it is not particularly relevant.
I said PetitParser is slower than it used to be (3 times slower).
I used the relative speed of that benchmark to estimate. Ranking is:
RBParser: 400ms
SmaCC StParser: 2100ms
PPSmalltalkParser: 9000ms where I expected it to be, from Lukas numbers,
at 3000ms or less. Hence 3 times slower than it used to be (and 22 times
slower than the hand written parser)
I have a fair idea of where SmaCC is slow, and its totally not where I
expected it. But as it has no asymptotic performance problem, it works
well as a compiler front-end for C, for example.
Bench is simply to run:
ObjectAndMorph do: [ :each | PPSmalltalkParser parse: each ]
(replace with RBParser>>parseMethod:, StParser>>parseMethod: to compare)
With, somewhere, in a global, this:
ObjectAndMorph := Object allMethods , Morph allMethods collect: #sourceCode
to avoid having the sourceCode polluting the profile.
(Note: run times on Spur don't differ much, so no gain there to expect).
Thierry
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23 comments
7 participants
participants (7)
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Jan Kurš -
Johan Fabry -
stepharo -
Sven Van Caekenberghe -
Thierry Goubier -
Tudor Girba -
Usman Bhatti