Brian Powell wrote: > I ran a final test which I find very strange: I ran the same test case > on 1 cpu. The MVAPICH2 case was 23% faster!?!? This makes little sense > to me. Both are using ifort as the mpif90 compiler using *identical* > optimization flags, etc. I don't understand how the results could be > different.
Are you saying the output of mpicc/mpif90 -show has the same optimization flags? MPICH2 usually puts it's own optimization flags into the wrappers. Jed
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