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Subject: Re: g++ 3.4 and -fprofile-generate

Author: Robert Hyatt

Date: 12:33:24 02/16/05

Go up one level in this thread

On February 16, 2005 at 14:28:57, Dieter Buerssner wrote:

>On February 16, 2005 at 13:19:46, Robert Hyatt wrote:
>
>>On February 16, 2005 at 13:09:14, Frank Phillips wrote:
>
>>>I have been using the profile generated optimisation option, but the code it
>>>produces is no faster then with simple -O3.
>
>I have no experience on AMD64. On x86 it works well for me, under Linux and
>Windows.
>
>>ICC (Intel's compiler) works fine and that is what I use
>>myself.
>
>Does profile guided optimizatation with ICC work for you, when you run crafty
>under xboard. It doesn't work for me.

Never tried.  I do my profile runs via a "Make profile" where I have a target
that compiles for profiling, runs a bunch of test cases, then compiles using the
data gathered to improve the code.  So my profiling is all in "command mode" as
well, which is just as good since the xboard stuff is not in the search of my
program at all anyway.


> Console runs work fine. With gcc, I can
>rund a match Yace-Crafty under Xboard. That gave better speedups than
>test-suites. But no luck with ICC here. I get very modest speedups with PGO and
>ICC (more with gcc). However, ICC is fast even without PGO.

I can't get gcc to compile and run crafty with profiling optimizations.  It will
produce the profile data files fine, but when I go to re-compile with the
options to use the profile data, it complains about one or more of the profile
data files being corrupted.  I've tested this hundreds of times since this was
put into gcc, no luck at all.  I seem to recall I might have gotten it to work
on the opteron last year, but I don't believe there was any speedup if I did,
and I might well be remembering that wrong anyway.

But gcc won't profile-optimize for me period. although it will profile just fine
and produce output that helps in analyzing performance.



>
>Regards,
>Dieter

• Re: g++ 3.4 and -fprofile-generate Andrew Williams 12:57:46 02/16/05
  • Re: g++ 3.4 and -fprofile-generate Robert Hyatt 13:26:50 02/16/05
    • Re: g++ 3.4 and -fprofile-generate Frank Phillips 15:29:53 02/16/05
    • Re: g++ 3.4 and -fprofile-generate Gian-Carlo Pascutto 14:53:10 02/16/05
      • Re: g++ 3.4 and -fprofile-generate Robert Hyatt 17:53:19 02/16/05
        • Re: g++ 3.4 and -fprofile-generate Andrew Williams 00:05:49 02/17/05
          • Re: g++ 3.4 and -fprofile-generate Gian-Carlo Pascutto 00:55:30 02/17/05

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