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Subject: Re: [OMPI users] Performance: MPICH2 vs OpenMPI
From: Brock Palen (brockp_at_[hidden])
Date: 2008-10-08 11:29:30


>
> Jeff,
>
> You probably already know this but the obvious candidate here is the
> memcpy() function, icc sticks in it's own which in some cases is much
> better than the libc one. It's unusual for compilers to have *huge*
> differences from code optimisations alone.

I know this is off topic, but I was interested in this performance,
I compared dcopy() from blas, memcpy() and just C code with optimizer
turned up in PGI/7.2

Results are here:

http://www.mlds-networks.com/index.php/component/option,com_mojo/
Itemid,29/p,49/

</OT>

>
> Ashley,
>
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