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RE: [cdt-dev] Performance problems building C++ ASTs
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Before going to far, Beth, is this a regression? Was it faster before?
Our timing for the trilogy (stdio.h, windows.h, iostream) was always in
the 3 second area doing a full parse. The time of the parse is relative
to the number of tokens read in. Are you comparing C apples with C++
apples?
Cheers,
Doug.
________________________________
From: cdt-dev-bounces@xxxxxxxxxxx
[mailto:cdt-dev-bounces@xxxxxxxxxxx] On Behalf Of Mike Kucera
Sent: Wednesday, May 21, 2008 2:15 PM
To: CDT General developers list.
Subject: RE: [cdt-dev] Performance problems building C++ ASTs
I think you can get a reference to the IIndex using
CCorePlugin.getIndexManager().getIndex(tu.getCProject()).
Then call getAST() with the option
ITranslationUnit.AST_SKIP_ALL_HEADERS.
This will cause the preprocessor to ignore #include directives,
which is a huge performance boost. Bindings and macro calls will be
resolved using the index when necessary.
I don't know if the OpenMP analysis code depends on a full parse
though.
But it seems strange that parsing would be so much faster for C
than C++. Are you calling the parser exactly the same way in both cases?
I can see that the current code uses the CDOM.
Is CDOM something that is supposed to be deprecated eventually?
Should we do it for 5.0?
Mike Kucera
Software Developer
IBM Eclipse CDT Team
mkucera@xxxxxxxxxx
Beth Tibbitts ---05/21/2008 01:14:28 PM---So how do I improve
this? Can you provide some suggestions?
Beth Tibbitts <tibbitts@xxxxxxxxxx>
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05/21/2008 01:13 PM
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RE: [cdt-dev] Performance problems building C++ ASTs
So how do I improve this? Can you provide some suggestions?
...Beth
Beth Tibbitts (859) 243-4981 (TL 545-4981)
High Productivity Tools / Parallel Tools http://eclipse.org/ptp
<http://eclipse.org/ptp>
IBM T.J.Watson Research Center
Mailing Address: IBM Corp., 745 West New Circle Road, Lexington,
KY 40511
"Schorn, Markus" <Markus.Schorn@xxxxxxxxxxxxx>
"Schorn, Markus"
<Markus.Schorn@xxxxxxxxxxxxx>
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05/21/08 01:00 PM
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RE: [cdt-dev] Performance problems building C++ ASTs
The speed depends on the options you use with
IASTTranslationUnit.getAST(...). If you are not using an index, parsing
an entire project will be too slow.
Markus.
________________________________
From: cdt-dev-bounces@xxxxxxxxxxx [
mailto:cdt-dev-bounces@xxxxxxxxxxx <mailto:cdt-dev-bounces@xxxxxxxxxxx>
] On Behalf Of Beth Tibbitts
Sent: Wednesday, May 21, 2008 5:01 PM
To: cdt-dev@xxxxxxxxxxx
Subject: [cdt-dev] Performance problems building C++ ASTs
Importance: Low
I'm tracking down a performance problem (CDT 4.0.3 for now)
running our PTP analysis tools on C++ code.
Getting the IASTTranslationUnit from the ITranslationUnit seems
to be the culprit.
For C code,
IASTTranslationUnit atu = itranslationunit.getAST();
takes a few hundredths of a sec
For a C++ file, it takes on the order of a second and a half.
Any idea how I can speed this up? Analyzing a large C++ project
is impossible at this rate.
Most of our initial analysis was on plain C code and it seems to
pose no large problems.
...Beth
Beth Tibbitts (859) 243-4981 (TL 545-4981)
High Productivity Tools / Parallel Tools http://eclipse.org/ptp
<http://eclipse.org/ptp>
IBM T.J.Watson Research Center
Mailing Address: IBM Corp., 745 West New Circle Road, Lexington,
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