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); ... hwloc_set_cpubind(... cpuset, HWLOC_CPUBIND_PROCESS) ... hwloc_bitmap_free(cpuset); This uses core logical indexes. If you want physical indexes, let me know (but those makes sense for PUs, not really for Cores). > On the other hand, I'd like to know if binding a process in there > would lock its spawned threads. Each thread inside the process basically gets the same binding as the entire process. Brice
