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Re: [Starpu-devel] Performance issues when specifying const and __attribute__ ((output))


Chronologique Discussions 
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  • From: Mehdi AMINI <mehdi.amini@silkan.com>
  • To: Samuel Thibault <samuel.thibault@ens-lyon.org>, starpu-devel@lists.gforge.inria.fr
  • Subject: Re: [Starpu-devel] Performance issues when specifying const and __attribute__ ((output))
  • Date: Mon, 02 Jul 2012 14:26:05 +0200
  • List-archive: <http://lists.gforge.inria.fr/pipermail/starpu-devel>
  • List-id: "Developers list. For discussion of new features, code changes, etc." <starpu-devel.lists.gforge.inria.fr>
Hi,

Le 02/07/2012 13:52, Samuel Thibault a écrit :
Mehdi AMINI, le Mon 02 Jul 2012 12:10:19 +0200, a écrit :
$ STARPU_NCUDA=1 STARPU_NCPUS=0 ./bicg_starpu_naive
192.2
$ STARPU_NCUDA=1 STARPU_NCPUS=0 ./bicg_starpu
746.5

Ouch!

Could you dump traces so we have an idea of what is happening?


Are the FXT traces enough? You'll find them here for both versions :

http://mehdi.amini.fr/StarPU/

FYI, currently my configure flags are the following :

$ ./configure --prefix=/home/amini/StarPU/starpu-install/ --disable-cpu --disable-opencl --with-fxt=/home/amini/fxt-install/

Thanks,

Mehdi



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