[SCore-users-jp] Re: [SCore-users] GM availability on SCore, when ???

[Shinji Sumimoto]

Hi.

Thank you for the information.

I will invesitigate the performance.

Shinji.

From: Emile CARCAMO <emile.carcamo at nec.fr>
Subject: [SCore-users-jp] Re: [SCore-users] GM availability on SCore, when ???
Date: Thu, 19 Dec 2002 15:53:46 +0100
Message-ID: <200212191453.gBJErkY07276 at emilepc.ess.nec.fr>

emile.carcamo> 
emile.carcamo> 
emile.carcamo> s-sumi at flab.fujitsu.co.jp said:
emile.carcamo> > Have you used mpi_zerocopy=on on your benchmark? The default option
emile.carcamo> > MPICH/SCore is mpi_zerocopy=off. 
emile.carcamo> >
emile.carcamo> > Which benchmark are you using? Could you show the performance results?
emile.carcamo> > 
emile.carcamo> 
emile.carcamo> Dear Shinji-san,
emile.carcamo> 
emile.carcamo> 	Sorry for not replying earlier ... Yes we have used the
emile.carcamo> 	option "mpi_zerocopy=on" when issuing the scrun command
emile.carcamo> 	within a SCore scout session :
emile.carcamo> 
emile.carcamo> 	     scrun -nodes=2x1,mpi_zerocopy=on ./sendrecv
emile.carcamo> 
emile.carcamo> 	With this sample benchmark, we noticed a peak transfer
emile.carcamo> 	rate looking like this :
emile.carcamo> 
emile.carcamo> 			405 Mbytes/sec with GM/Myrinet
emile.carcamo> 			325 Mbytes/sec with PM/Myrinet
emile.carcamo> 
emile.carcamo> 	Here is the URL of another test we've also ran on our
emile.carcamo> 	Myrinet-2k cluster :
emile.carcamo> 
emile.carcamo> 		   http://www.hlrs.de/mpi/b_eff
emile.carcamo> 
emile.carcamo> 	and we noticed in that case about 100 Mbytes/sec with
emile.carcamo> 	PM/Myrinet and two times faster using GM/Myrinet ...
emile.carcamo> 
emile.carcamo> 	Please let us know if you need more inputs. I'll be glad
emile.carcamo> 	to hear from anybody who already performed such kind of
emile.carcamo> 	tests ... Thanks for your help, and best regards.
emile.carcamo> 
emile.carcamo> -- 
emile.carcamo> Emile_CARCAMO           NEC European            http://www.ess.nec.de
emile.carcamo> System Engineer         Supercomputer           mailto:emile.carcamo at nec.fr
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-----
Shinji Sumimoto    E-Mail: s-sumi at bd6.so-net.ne.jp