Dear Gromacs users,<br><br>I have been installing Gromacs on a Power6
4.7 GHz with Infiniband, GBit-Ethernet
<br><br>before calling configure, I set:<br><br>export LDFLAGS="-L/gpfs/schraven/fftw3/lib"<br>export CPPFLAGS="-I/gpfs/schraven/fftw3/include"<br>export CC="mpcc_r -q64"<br>export CFLAGS="-O3 -qstrict -qarch=auto -qtune=auto"<br>
export CXX="mpCC_r -q64"<br>export CXXFLAGS="-O3 -qstrict -qarch=auto -qtune=auto"<br>export F77="mpxlf_r -q64"<br>### O3 gives warning: The NOSTRICT option (default at OPT(3)) has the potential to alter the semantics of a program.<br>
export FFLAGS="-O3 -qstrict -qnoprefetch -qarch=auto -qtune=auto"<br>export LIBS="-lmass"<br>export FLIBS= "-xlf -xlf90"<br>export OBJECT_MODE=64<br><br>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.<br>
<br>Does anyone have similar experience between these machines? Are there some things I should check?<br>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 ;)<br>
Hopefully I'm doing something wrong and the situation can still be improved?<br><br>Greetings, Pim<br><br>