Le 20/02/2012 19:06, Brice Goglin a écrit : > Le 20/02/2012 17:41, Albert Solernou a écrit : >> Hi, >> I'd like to bind a process to a cpuset, so that when it spawns on >> several threads, those are trapped on that cpuset. >> >> In order to do so, I want to define my own cpuset. Let's say I want it >> to include HWLOC_OBJ_CORE 2 and 5. How can I create this cpuset? The >> bitmap api sounds like the solution to me, but I couldn't relate the >> indexes in there into HWLOC_OBJects of any type... > If you want to bind to cores #2 and #5, do: > > hwloc_bitmap_t cpuset; > hwloc_obj_t core1, core2; > > core1 = hwloc_get_obj_by_type(topology, HWLOC_OBJ_CORE, 2); > if (!core1) > error... > core2 = hwloc_get_obj_by_type(topology, HWLOC_OBJ_CORE, 5); > if (!core2) > error... > cpuset = hwloc_bitmap_alloc(); > if (!cpuset); > error... > hwloc_bitmap_or(cpuset, cpuset, core1->cpuset); > hwloc_bitmap_or(cpuset, cpuset, core2->cpuset);
By the way, alloc()+or() can be optimized as dup(): cpuset = hwloc_bitmap_dup(core1->cpuset); if (!cpuset) error... hwloc_bitmap_or(cpuset, cpuset, core2->cpuset); Brice
