Dear Gromacs users, I have been installing Gromacs on a Power6 4.7 GHz with Infiniband, GBit-Ethernet
before calling configure, I set: export LDFLAGS="-L/gpfs/schraven/fftw3/lib" export CPPFLAGS="-I/gpfs/schraven/fftw3/include" export CC="mpcc_r -q64" export CFLAGS="-O3 -qstrict -qarch=auto -qtune=auto" export CXX="mpCC_r -q64" export CXXFLAGS="-O3 -qstrict -qarch=auto -qtune=auto" export F77="mpxlf_r -q64" ### O3 gives warning: The NOSTRICT option (default at OPT(3)) has the potential to alter the semantics of a program. export FFLAGS="-O3 -qstrict -qnoprefetch -qarch=auto -qtune=auto" export LIBS="-lmass" export FLIBS= "-xlf -xlf90" export OBJECT_MODE=64 I run on both machines at 8 cores (so within the board), and find the 8 power6 cores to be 4-5 times slower (!) than the 8 intel xeon cores. Does anyone have similar experience between these machines? Are there some things I should check? It's a bit useless to use the power6 at all with these kind of speeds, but they were already here anyway and amazon's 30 day refund on retour has expired already ;) Hopefully I'm doing something wrong and the situation can still be improved? Greetings, Pim
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