Hi, to all. First, thanks Tobias Burnus for the answers. I read https://computing.llnl.gov/tutorials/openMP/,but i didn't see it. Just i can't access to the node, i.e. i no have jobs running. For the next time i will read the gcc documentation. Thanks Tim Prince, for redirecting my mail. >how did it do with taskset or GOMP_OMP_AFFINITY settings, perhaps with a more up to date libgomp? i don't use GOMP_OMP_AFFINITY settings. i can't update libgomp. i don't try use taskset sorry, be couse the multithreading was off. >Do you have another job running? no, i have more results, with other size problem (i publish the median of the results). Regards!