[Beowulf] Re: Beowulf Digest, Vol 45, Issue 28

Tom Elken tom.elken at qlogic.com
Thu Nov 22 22:14:20 EST 2007


 > -----Original Message-----
> [mailto:beowulf-bounces at beowulf.org] On Behalf Of Håkon Bugge
> While I did the SPEC MPI 2007 for the Barcelona, I got the 
> following projections (8 nodes, 8 cores per node) for 
> SPECmpiM_base2007:
>     * PathScale 3.0, -march=core: 5.53
>     * PathScale 3.0, -march=opteron -msse3: 5.32
>     * PGI 7.0-7, -tp barcelona-64 + lots of fancy switches: 4.71
>     * PGI 7.0-7, -tp barcelona-64 -nomovnt -fast: 4.75 I 
> didn't have much time to play with compiler options. It was 
> interesting to see that the "wrong" architecture was better 
> using the PathScale compiler. Further, PathScale was 
> significant better than PGI 7.0-7, even though PGI had 
> support for the "right" architecture.

PathScale 3.1 is now available and has a -mtune/-march=barcelona flag.
So the results for Barcelona should now be improved.

-Tom
< My employer, QLogic, no longer has an association with the PathScale compiler >

> 
> The switches used for the PathScale compiler can be found at 
> the SPEC web, http://www.spec.org/mpi2007/results/res2007q4/
> 
> The final rate (5.61) was better, due improved memory 
> bandwidth (due to a better BIOS).
> 
> 
> 
> Hakon
> 
> 
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