Re: MPICH-GM 1.2.5..9.

No argument there. Intel seems to be well-accepted as the current fastest 
compiler.

On Tue, 25 Feb 2003, Christopher D. Maestas wrote:

> Chris,
> 
> Well we were interested in seeing how a compiler suite performs end to
> end rather than in a hybrid approach.  I ran some initial hpl compiling with
> a hyrbid approach, and there were some issues in the link stages already.  I can
> see the headaches already from the user, to help desk, to maintainer ... ;-)
> 
> I still maintain that on an end to end approach, the intel compiler suite would
> give better performance than the gcc suite, especially when trying to take
> advantage of Itanium2 and XEON intructions sets.  So with that in mind, there is
> still an advantage in compiling mpich-gm with the intel compilers over gcc.
> 
> Regards,
> 
> On Tue, 25 Feb 2003, Christopher Jordan wrote:
> 
> > 
> > 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
> > > 
> > > 
> > > 
> > > _______________________________________________
> > > Myrinet mailing list
> > > [email protected]
> > > http://email.osc.edu/mailman/listinfo/myrinet
> > > 
> > 
> > 
> 
> -- Chris
> 
> 
> 
> 

-- 

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

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