[SCore-users] GM availability on SCore, when ???

[Emile CARCAMO]

s-sumi at flab.fujitsu.co.jp said:
> Have you used mpi_zerocopy=on on your benchmark? The default option
> MPICH/SCore is mpi_zerocopy=off. 
>
> Which benchmark are you using? Could you show the performance results?
> 

Dear Shinji-san,

	Sorry for not replying earlier ... Yes we have used the
	option "mpi_zerocopy=on" when issuing the scrun command
	within a SCore scout session :

	     scrun -nodes=2x1,mpi_zerocopy=on ./sendrecv

	With this sample benchmark, we noticed a peak transfer
	rate looking like this :

			405 Mbytes/sec with GM/Myrinet
			325 Mbytes/sec with PM/Myrinet

	Here is the URL of another test we've also ran on our
	Myrinet-2k cluster :

		   http://www.hlrs.de/mpi/b_eff

	and we noticed in that case about 100 Mbytes/sec with
	PM/Myrinet and two times faster using GM/Myrinet ...

	Please let us know if you need more inputs. I'll be glad
	to hear from anybody who already performed such kind of
	tests ... Thanks for your help, and best regards.

-- 
Emile_CARCAMO           NEC European            http://www.ess.nec.de
System Engineer         Supercomputer           mailto:emile.carcamo at nec.fr
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