Re: MPICH-GM 1.2.5..9.

Yeah, you've got to test a hybrid, otherwise you're not really testing 
mpich-gm performance with a given compiler, you're testing the compiler's 
optimization of the code being compiled.  

I assume that mpich-gm supports the use of the $CC variable and the 
$CC-conf facility of the newer mpiches? These allow you to set up 
multiple compilers to link with one version of mpich (for any device, 
AFAIK).

On Mon, 24 Feb 2003, Christopher D. Maestas wrote:

> Patrick,
> 
> In trying to keep things as simple as possible we used:
> 	mpicc
> which called icc, that linked to the mpich library compiled with the intel compilers.
> 
> And the same for gcc,
> 	mpicc -> gcc -lmpich (compiled with gcc)
> And the same for pgi,
> 	mpicc -> pgcc -lmpich (compiled with pgi suite)
> 
> I haven't tried a hybrid or can't remember trying it :-) 
> 	mpicc -> icc -lmpich (compiled with gcc)
> 
> I can try it ... or rather put it on the list to try ...
> 
> Regards,
> 
> On 24 Feb 2003, Patrick Geoffray wrote:
> 
> > Hi Christopher,
> > 
> > On Mon, 2003-02-24 at 13:45, Christopher D. Maestas wrote:
> > > Yes there is a performance benefit in using mpich-gm with intel versus gcc.
> > > mpich-gm compilations with the intel compiler are comparable to mpich-gm
> > > compilations with the pgi compilers.  When testing hpl runs with the differently
> > > compiled mpich-gm releases, the intel and pgi compiled versions gave better results
> > > than the gcc compiled version.
> > 
> > Do you compile HPL with gcc or with the Intel compiler when linking with
> > MPICH-GM compiled with gcc ?
> > 
> > Patrick
> > 
> 
> --  Chris
> 
> 
> 
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-- 

Chris Jordan
------------
HPC Engineer
Center for High Performance Computing
University of New Mexico  
[email protected]
505.277.8259

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