AMD's Open64 compiler ?

Article: Bulldozer Benchmarks, What Do They Mean?
By: Vincent Diepeveen (diep.delete@this.xs4all.nl), April 5, 2011 12:02 pm
Room: Moderated Discussions
Alex (no@spam.org) on 4/4/11 wrote:
---------------------------
>>I think in this case - the point is that measuring AMD's performance based on GCC
>>(esp. with unknown settings) is going to be overly pessimistic. Especially for
>>FP code, I'd be vastly more comfortable if the compiler was Pathscale, PGI or ICC (without dispatching).
>
>Just out of curiosity, did you have time to test AMD's version of the Open64 compiler ?
>PathScales compiler was based on it, so it is probably also generating faster code than GCC ?
>
>Thanks
>
>Alex

I did test all of them. Realize open64 is based upon mipspro compiler. Back then when mipspro compiler was actual i remember emailing SGI some simple questions on whether they had faster versions and especially pgo, as even then already mipspro ran behind GCC and it still does, which is amazing if you realize clearly what GCC is.

When using pgo the open64 gets close in performance to GCC, both are in the same league then, though GCC wins the battle (and you can deduce from this that GCC doesn't really profit a lot from pgo); however that's lightyears away from other compilers which also didn't really improve that much past years (in case of my C code; for C++ codes the intel c++ 11.0 and newer series seem great, but we must warn first then that most C++ programs really are a lot slower than C programs thanks to deep layered subclass structures which is a pain for compilers). We're speaking of a gap of 20%+ difference in performance at modern AMD processors as well as at a tad older ones, going up another 5% making it a 25%+ difference when using intel processors. Amazingly this speedgap is quite constant despite the different architectures of processors, so it really seems to be the quality of the code, not so much processor dependant, though of course different exes get produced for different processors.

Open64 really is a lot behind for generic code generation, i guess they optimize it for a few testsets. If you can't even beat GCC that really sucks.

Being behind 20-25% in performance really is a lot.

Vincent
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New article: Bulldozer benchmark analysisDavid Kanter2011/03/30 02:27 AM
  New article: Bulldozer benchmark analysisNaN2011/03/30 07:47 AM
    New article: Bulldozer benchmark analysisDavid Kanter2011/03/30 09:25 AM
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                  Post removedDavid Kanter2011/04/02 12:39 PM
          New article: Bulldozer benchmark analysisanonymous2011/04/04 05:08 AM
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              New article: Bulldozer benchmark analysisNaN2011/04/02 09:24 AM
                New article: Bulldozer benchmark analysisDavid Kanter2011/04/02 12:36 PM
                  AMD's Open64 compiler ?Alex2011/04/04 02:23 AM
                    AMD's Open64 compiler ?David Kanter2011/04/04 08:19 AM
                      AMD's Open64 compiler ?Richard Cownie2011/04/04 09:52 AM
                        AMD's Open64 compiler ?David Kanter2011/04/04 01:20 PM
                          AMD's Open64 compiler ?none2011/04/04 02:25 PM
                        AMD's Open64 compiler ?gallier22011/04/04 11:06 PM
                          thanks, very interesting (NT)Richard Cownie2011/04/05 03:44 AM
                          AMD's Open64 compiler ?Andreas Stiller2011/04/05 08:23 AM
                        AMD's Open64 compiler ?Vincent Diepeveen2011/04/06 01:11 AM
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                                                                            File size optimizationsRicardo B2011/04/25 08:22 AM
                                                                              ContinuationRicardo B2011/04/25 08:25 AM
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                                                                            File size optimizationsjrl2011/04/25 05:54 PM
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                                    Imperative compilers (and the lack of it)Azazel2011/04/12 08:23 PM
                                Imperative compilers (and the lack of it)none2011/04/10 06:00 AM
                                  Imperative compilers (and the lack of it)dmsc2011/04/10 06:39 AM
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                                Imperative compilers (and the lack of it)EduardoS2011/04/10 12:55 PM
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                                      Imperative compilers (and the lack of it)gallier22011/04/14 04:47 AM
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                                        Imperative compilers (and the lack of it)Konrad Schwarz2011/04/15 03:43 AM
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                                Imperative compilers (and the lack of it)gallier22011/04/11 09:26 AM
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                                    I wonder why.?2011/04/11 11:44 PM
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                                AMD's Open64 compiler ?none2011/04/10 07:23 AM
                                  AMD's Open64 compiler ?Eugene Nalimov2011/04/11 03:57 PM
                                    AMD's Open64 compiler ?EduardoS2011/04/12 02:55 PM
                                AMD's Open64 compiler ?Megol2011/04/10 11:05 PM
                                  AMD's Open64 compiler ?Vincent Diepeveen2011/04/20 12:52 PM
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                    AMD's Open64 compiler ?Vincent Diepeveen2011/04/05 12:02 PM
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              AMD's memory controllers are fineVincent Diepeveen2011/04/06 01:36 AM
                AMD's memory controllers are fineanon2011/04/06 06:59 AM
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