Hi there
I'm running some tests on the following machine : - 2x AMD Opteron 6380 ( 32 cores ) - 64GB RAM - Ubuntu 12.04 ( gfortran 4.6, fftw 3.3.1, openblas 0.2.8, openmpi 1.4.3 ) Using these benchmarks : - Medium size DEISA benchmark : http://qe-forge.org/gf/project/q-e/frs/?action=FrsReleaseView&release_id=45 - Medium-size : http://qe-forge.org/gf/project/q-e/frs/?action=FrsReleaseView&release_id=44 And the machines behavior was exactly the same. An example: DEISA Benchmark: -8 cores : 46m57.62s 16 cores : 38m26.81s 24 cores : 39m48.91s 32 cores : 46m2.46s After more research on it, i've found the following graphic from other, older tests of quantum espresso, which shows the same behavior ( Page 8 ) : http://hpcadvisorycouncil.com/pdf/ESPRESSO_Analysis_Intel_x5670.pdf Is this the expected behavior of QE for these benchmarks ? If yes, why ?
