digitalmars.D.learn - Does LDC support profiling at all?
- Chris Katko (6/6) Dec 22 2017 DMD can use -profile and -profile=gc. But I tried for HOURS to
-
Nathan S.
(3/9)
Dec 22 2017
Is -fprofile-instr-generate=
what you're - Johan Engelen (13/18) Dec 23 2017 Fine grained PGO profiling:
- David Nadlinger (9/20) Dec 23 2017 Apart from profiling based on compiler instrumentation, don't
- Chris Katko (10/28) Dec 23 2017 Wow, thanks guys! I didn't realize I'd get so much information so
- Johan Engelen (3/6) Dec 24 2017 This would help us out a lot, thanks.
- Prasun Anand (16/22) Dec 26 2017 Hi Chris,
DMD can use -profile and -profile=gc. But I tried for HOURS to find the equivalent for LDC and came up with only profile-guided optimization--which I don't believe I want. Yet, if we can get PGO... where's the PROFILE itself it's using to make those decisions! :) Thanks.
Dec 22 2017
Nathan S. <no.public.email example.com> On Friday, 22 December 2017 at 09:52:26 UTC, Chris Katko wrote:DMD can use -profile and -profile=gc. But I tried for HOURS to find the equivalent for LDC and came up with only profile-guided optimization--which I don't believe I want. Yet, if we can get PGO... where's the PROFILE itself it's using to make those decisions! :) Thanks.Is -fprofile-instr-generate=<place to write profile> what you're looking for?
Dec 22 2017
On Friday, 22 December 2017 at 09:52:26 UTC, Chris Katko wrote:DMD can use -profile and -profile=gc. But I tried for HOURS to find the equivalent for LDC and came up with only profile-guided optimization--which I don't believe I want. Yet, if we can get PGO... where's the PROFILE itself it's using to make those decisions! :)Fine grained PGO profiling: -fprofile-instr-generate http://johanengelen.github.io/ldc/2016/07/15/Profile-Guided-Optimization-with-LDC.html Function entry/exit profiling: -finstrument-functions https://github.com/ldc-developers/ldc/issues/1839 https://www.youtube.com/watch?v=LNav5qvyK7I I suspect it is not too much effort to add DMD's -profile and -profile=gc to LDC, but noone has done it yet. Another thing that is relatively easy to add to LDC: https://llvm.org/docs/XRay.html -Johan
Dec 23 2017
On Saturday, 23 December 2017 at 12:23:33 UTC, Johan Engelen wrote:Fine grained PGO profiling: -fprofile-instr-generate http://johanengelen.github.io/ldc/2016/07/15/Profile-Guided-Optimization-with-LDC.html Function entry/exit profiling: -finstrument-functions https://github.com/ldc-developers/ldc/issues/1839 https://www.youtube.com/watch?v=LNav5qvyK7I I suspect it is not too much effort to add DMD's -profile and -profile=gc to LDC, but noone has done it yet. Another thing that is relatively easy to add to LDC: https://llvm.org/docs/XRay.htmlApart from profiling based on compiler instrumentation, don't forget that LDC uses the standard object file formats/runtime libraries for the various platforms, so all the usual profiling tools like perf, VTune, Valgrind, etc. work just fine. I would usually start with one of the latter for general-purpose optimization work. — David
Dec 23 2017
On Saturday, 23 December 2017 at 12:23:33 UTC, Johan Engelen wrote:On Friday, 22 December 2017 at 09:52:26 UTC, Chris Katko wrote:Wow, thanks guys! I didn't realize I'd get so much information so quickly here on the forums. The documentation online for LDC is very sparse and confusing. After spending plenty of attempts, I went out of my way to install DMD just to get profiling because I couldn't figure it out with LDC. It would probably be really helpful to get a clear Wiki guide for this information LDC. I'll write it myself if necessary once I try your recommendations and test them out.DMD can use -profile and -profile=gc. But I tried for HOURS to find the equivalent for LDC and came up with only profile-guided optimization--which I don't believe I want. Yet, if we can get PGO... where's the PROFILE itself it's using to make those decisions! :)Fine grained PGO profiling: -fprofile-instr-generate http://johanengelen.github.io/ldc/2016/07/15/Profile-Guided-Optimization-with-LDC.html Function entry/exit profiling: -finstrument-functions https://github.com/ldc-developers/ldc/issues/1839 https://www.youtube.com/watch?v=LNav5qvyK7I I suspect it is not too much effort to add DMD's -profile and -profile=gc to LDC, but noone has done it yet. Another thing that is relatively easy to add to LDC: https://llvm.org/docs/XRay.html -Johan
Dec 23 2017
On Sunday, 24 December 2017 at 02:48:32 UTC, Chris Katko wrote:It would probably be really helpful to get a clear Wiki guide for this information LDC. I'll write it myself if necessary once I try your recommendations and test them out.This would help us out a lot, thanks. -Johan
Dec 24 2017
On Friday, 22 December 2017 at 09:52:26 UTC, Chris Katko wrote:DMD can use -profile and -profile=gc. But I tried for HOURS to find the equivalent for LDC and came up with only profile-guided optimization--which I don't believe I want. Yet, if we can get PGO... where's the PROFILE itself it's using to make those decisions! :) Thanks.Hi Chris, I think you might be looking for google perftools. See: 1. https://github.com/prasunanand/gperftools_d/ 2. https://github.com/gperftools/gperftools I have been using gperftools_d a lot to profile my code and optimize.It generates really cool [graphs](https://github.com/prasunanand/gperftools_d/blob/master/examples/profile.pdf). If you need PGO, you can look here for reference: https://github.com/prasunanand/faster_lmm_d/blob/master/Makefile#L122 Let me know if this helps or you face any issues using gperftools_d. Regards, Prasun
Dec 26 2017