Re: [OMPI users] errors trying to run a simple mpi task

[dani]

OK, I see the part I missed - changing the MTT parameters for mlx4_core. My only issue is that currently there is no num_mtt or log_num_mtt, but there is log_mtts_per_seg in /sys/module/mlx4_core/parameters Has the parameter names changed? I know I can simply set log_mtts_per_seg to 5 (it's currently 3) but the discussion at the mailing list (http://www.open-mpi.org/community/lists/devel/2012/08/11417.php) seems to indicate it's better to use numerous small chunks to avoid fragmentation. Can you, or anyone else, provide documentation for the current parameters of mlx4_core? I can't locate it in the mellanox or ofed sites. On 24/06//2013 18:02, Jeff Squyres (jsquyres) wrote: On Jun 23, 2013, at 3:21 PM, dani <d...@letai.org.il> wrote: See this Open MPI FAQ item for more information on these Linux kernel module parameters: http://www.open-mpi.org/faq/?category=openfabrics#ib-locked-pages BTW, the node has 64GB total ram. Is it possible openmpi is limited to only 32GB? or possibly the ofed installation has such a limit? Yes. See the FAQ item cited in the help message for more detail.