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Bad performance FX on ACML-multithread (Linux)

Question asked by huber on Apr 2, 2014
Latest reply on Apr 17, 2014 by kknox

Hi! I use GetDP with MUMPS (4.10) and ACML (5.3.1) instead BLAS (ATLAS, OpenBLAS). I use "gfortran64_fma4_mp" version of ACML. When I set environment variable OMP_NUM_THREADS=4 (or more) on system with FX-6300 or OMP_NUM_THREADS=3 (or 4) for A8-5600K the computing performance dramatically fall down. What's wrong? Or it's normally?

See image:

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