[hwloc-users] hwloc_get_last_cpu_location on AIX

[Hendryk Bockelmann]

Hello,




support = hwloc_topology_get_support(topology);
ret = hwloc_get_cpubind(topology, set, HWLOC_CPUBIND_THREAD);
if (support->cpubind->get_thisthread_cpubind) {
  hwloc_bitmap_asprintf(&str, set);
  printf("--> cpuset (thread %d) is %s \n",omp_get_thread_num(),str);
}
if (support->cpubind->get_thisthread_last_cpu_location) {
  ret = hwloc_set_cpubind(topology, set, HWLOC_CPUBIND_THREAD);
  last = hwloc_bitmap_alloc();
  ret = hwloc_get_last_cpu_location(topology,last,HWLOC_CPUBIND_THREAD);
  hwloc_bitmap_asprintf(&str, last);
  printf("--> cpu_loca (thread %d) is %s \n",omp_get_thread_num(),str);
}

this is what I found in src/tests/hwloc_get_last_cpu_location.c

Running this on my local linux machine gives e.g.:

--> cpuset (thread 1) is 0x00000005
--> cpuset (thread 0) is 0x00000005
--> cpu_loca (thread 0) is 0x00000004
--> cpu_loca (thread 1) is 0x00000001



but on the AIX cluster I just get:

--> cpuset (thread 0) is 0x00000003
--> cpuset (thread 1) is 0x00000003

hence, (support->cpubind->get_thisthread_last_cpu_location) is false.


Best,
Hendryk

I just ran into trouble using hwloc_get_last_cpu_location on our POWER6 cluster with AIX6.1 My plan is to find out if the binding of the job-scheduler was correct for MPI-tasks and OpenMP-threads. This is what I want to use: hence, (support->cpubind->get_thisthread_cpubind) and (support->cpubind->get_thisthread_last_cpu_location) are both true Now the question is whether this is related to my install of hwloc-1.4.1 or a general problem on AIX? Furthermore, I would like to know if there is any other change to use hwloc to check correct task/thread binding?

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