Ralph, We added cgroups integration support into Grid Engine a few months ago, and we ended up implementing routines that write values to "memory.memsw.limit_in_bytes", "memory.limit_in_bytes", "memory.soft_limit_in_bytes", etc... We just simply write the values out to the cgroups files.
http://blogs.scalablelogic.com/2012/05/grid-engine-cgroups-integration.html I am interested in seeing how Greenplum/EMC implements cgroups limits. Brice - cgroups allow system administrators to set the resource limit of a process (or a group of processes) by interacting with the cgroups virtual fs. Once the processes are added to a cgroup, the memory usage limit can be added or changed as simply as just just by doing: # echo 4M > /sys/fs/cgroup/memory/0/memory.limit_in_bytes For details, see "3. User Interface": http://www.kernel.org/doc/Documentation/cgroups/memory.txt Rayson ================================================== Open Grid Scheduler - The Official Open Source Grid Engine http://gridscheduler.sourceforge.net/ On Fri, Nov 2, 2012 at 5:18 PM, Brice Goglin <brice.gog...@inria.fr> wrote: > Hello Ralph, > > I am not very familiar with these features. What system mechanism do you > currently use for this? Linux cgroups? Any concrete example of what you > would like to do? > > Brice > > > > Le 02/11/2012 22:12, Ralph Castain a écrit : >> Hi folks >> >> We (Greenplum) have a need to support resource limits (e.g., memory and cpu >> usage) on processes running under Open MPI's RTE. OMPI uses hwloc for >> processor and memory affinity, so this seems a likely place to add the >> required support. Jeff tells me that it doesn't yet exist in hwloc - I'm >> wondering if you would welcome and/or be willing to consider contributions >> from our engineers towards adding this capability? >> >> Obviously, we'd need to discuss how and where to do the extension. Just >> wanted to first see if this is an option, or if we should do it directly in >> OMPI. >> Ralph >> >> >> _______________________________________________ >> hwloc-devel mailing list >> hwloc-de...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/hwloc-devel > > _______________________________________________ > hwloc-devel mailing list > hwloc-de...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/hwloc-devel
