Thanks Brice, it's exactly what I need. I checked the docs, linux-libnuma.h, and linux.h earlier but I could not find what I needed, as it did not mention cpuset or cgroups :-)
However, the hwloc_bitmap_list_snprintf() function you pointed me to is exactly the format used by cpuset cgroups (and the older Linux cpuset), and now I can finally get some sleep (it's 3am here!!). Thanks again! Rayson ================================================== Open Grid Scheduler - The Official Open Source Grid Engine http://gridscheduler.sourceforge.net/ On Tue, Jun 19, 2012 at 2:55 AM, Brice Goglin <brice.gog...@inria.fr> wrote: > Hello, > > Isn't this what hwloc_bitmap_list_sscanf/snprintf/asprintf do ? (added > in 1.2.0) > > Brice > > > > Le 19/06/2012 08:32, Rayson Ho a écrit : >> hwloc already has code (linux-libnuma.h) for hwloc_cpuset_t to libnuma >> data type conversion. Does it make sense to add functions to convert >> hwloc_cpuset_t types to the cpuset string format used by Linux's >> cgroups? >> >> The cpuset format used by cgroups is not difficult to handle (in fact, >> the user interface is same as/very similar to the older cpuset >> implementation). Eg. create a cpuset that includes CPU 2 & 3 for >> OGS/Grid Engine: >> >> # echo 2-3 > /sys/fs/cgroup/cpuset/gridengine/cpuset.cpus >> >> Ref: http://www.kernel.org/doc/Documentation/cgroups/cpusets.txt >> >> >> We are pinging the list because we use hwloc for topology binding, and >> we also added cgroups support (for a lot of things) in OGS/Grid >> Engine: >> >> http://blogs.scalablelogic.com/2012/05/grid-engine-cgroups-integration.html >> >> We are planning to integrate hwloc & cgroups (and skip libnuma)... And >> we want to choose which method we use at runtime. While hwloc can be >> used by non-root applications, the applications can modify the >> affinity mask themselves and thus they can escape from the "cpuset" >> (as least with the current hwloc implementation that uses >> sched_setaffinity). The cgroups cpuset support is only available to >> root, but once binded, batch jobs running as non-root could not escape >> from the cpuset. >> >> Rayson >>
