[mvapich-discuss] SSE4 extensions on Intel architecture

[Jacob Anderson]

Will do.

For our MVAPICH2 (1.7) build, I am using this command line on the E5620 and
X5670 machines:

./configure --prefix=/usr/mpi/gcc/mvapich2-1.7
  --enable-fast=O3
  MPICH2LIB_CFLAGS='-march=native -msse4.2 -maes' 
  MPICH2LIB_FFLAGS='-march=native -msse4.2 -maes'
  MPICH2LIB_CXXFLAGS='-march=native -msse4.2 -maes' 
  MPICH2LIB_FCFLAGS='-march=native -msse4.2 -maes' 
  --with-file-system=nfs
  GCC=/usr/bin/gcc44
  CC=/usr/bin/gcc44
  CXX=/usr/bin/g++44
  F77=/usr/bin/gfortran44
  FC=/usr/bin/gfortran44

This will be running on Mellanox fibre (QDR IB).

> -----Original Message-----
> From: Dhabaleswar Panda [mailto:panda at cse.ohio-state.edu]
> Sent: Tuesday, November 01, 2011 10:26 AM
> To: Jacob Anderson
> Cc: mvapich-discuss at cse.ohio-state.edu
> Subject: Re: [mvapich-discuss] SSE4 extensions on Intel architecture
> 
> Hi Jake,
> 
> > Forgive the "can it do this" question, but if I enable the SSE4
> > optimizations when compiling mvapich2-1.7, will it be of any value to
> > the performance of the library?
> 
> Thanks for your question. We have done some internal evaluation and we
> do not see much benefits at the level of mvapich2 communication with
> SSE4 optimization. However, you can use SSE4 optimization with
> applications to get the benefits at the computation-level.
> 
> Let us know if you observe any different trend.
> 
> Thanks,
> 
> DK
> 
> > Thanks
> >
> > -- jake
> >
> >
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