Edit: solved, it does go into multi-threading mode.
I'm testing HPL (www.netlib.org/benchmark/hpl) with acml_mp 4.0.1. The version of gcc & gfortran is 4.2.2. Somehow, the HPL code doesn't execute in multi-threaded way even if I've properly set OMP_NUM_THREADS.
The gfortran command is: gfortran -W -Wall -fopenmp -DAdd__ -DF77_INTEGER=int -DStringSunStyle -lacml_mp -lacml_mv ...
To verify that my installation of gcc/gfortan is correct, I've successfully run an OpenMP-enabled Fortran code (but without using acml_mp).
Any idea/pointer on how to track and fix this problem?