I recommend using vader for CMA. It has code to get around the ptrace setting. Run with mca_btl_vader_single_copy_mechanism cma (should be the default).
-Nathan On Wed, Feb 18, 2015 at 02:56:01PM -0500, Eric Chamberland wrote: > Hi, > > I have configured with "--with-cma" on 2 differents OS (RedHat 6.6 and > OpenSuse 12.3), but in both case, I have the following error when launching > a simple mpi_hello_world.c example: > > /opt/openmpi-1.8.4_cma/bin/mpiexec --mca btl_sm_use_cma 1 -np 2 /tmp/hw > -------------------------------------------------------------------------- > WARNING: Linux kernel CMA support was requested via the > btl_vader_single_copy_mechanism MCA variable, but CMA support is > not available due to restrictive ptrace settings. > > The vader shared memory BTL will fall back on another single-copy > mechanism if one is available. This may result in lower performance. > > Local host: compile > -------------------------------------------------------------------------- > Hello world from process 0 of 2 > Hello world from process 1 of 2 > [compile:23874] 1 more process has sent help message help-btl-vader.txt / > cma-permission-denied > [compile:23874] Set MCA parameter "orte_base_help_aggregate" to 0 to see all > help / error messages > > After I googled the subject, it seems there is a kernel parameter to modify, > but I can't find it for OpenSuse 12.3 or RedHat 6.6... > > Here is the "config.log" issued from RedHat 6.6... > > http://www.giref.ulaval.ca/~ericc/ompi_bug/config.184_cma.gz > > Thanks, > > Eric > _______________________________________________ > users mailing list > us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2015/02/26339.php
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