bool ProcessInfo::checkNumaEnabled() {
lgrp_cookie_t cookie = lgrp_init(LGRP_VIEW_OS);
if (cookie == LGRP_COOKIE_NONE) {
warning() << "lgrp_init failed: " << errnoWithDescription();
return false;
}
ON_BLOCK_EXIT(lgrp_fini, cookie);
int groups = lgrp_nlgrps(cookie);
if (groups == -1) {
warning() << "lgrp_nlgrps failed: " << errnoWithDescription();
return false;
}
// NUMA machines have more then 1 locality group
return groups > 1;
}
static void
hwloc_look_lgrp(struct hwloc_topology *topology)
{
lgrp_cookie_t cookie;
unsigned curlgrp = 0;
int nlgrps;
lgrp_id_t root;
if ((topology->flags & HWLOC_TOPOLOGY_FLAG_WHOLE_SYSTEM))
cookie = lgrp_init(LGRP_VIEW_OS);
else
cookie = lgrp_init(LGRP_VIEW_CALLER);
if (cookie == LGRP_COOKIE_NONE)
{
hwloc_debug("lgrp_init failed: %s\n", strerror(errno));
return;
}
nlgrps = lgrp_nlgrps(cookie);
root = lgrp_root(cookie);
if (nlgrps > 0) {
hwloc_obj_t *glob_lgrps = calloc(nlgrps, sizeof(hwloc_obj_t));
browse(topology, cookie, root, glob_lgrps, &curlgrp);
#if HAVE_DECL_LGRP_LATENCY_COOKIE
if (nlgrps > 1) {
float *distances = calloc(curlgrp*curlgrp, sizeof(float));
unsigned *indexes = calloc(curlgrp,sizeof(unsigned));
unsigned i, j;
for (i = 0; i < curlgrp; i++) {
indexes[i] = glob_lgrps[i]->os_index;
for (j = 0; j < curlgrp; j++)
distances[i*curlgrp+j] = (float) lgrp_latency_cookie(cookie, glob_lgrps[i]->os_index, glob_lgrps[j]->os_index, LGRP_LAT_CPU_TO_MEM);
}
hwloc_distances_set(topology, HWLOC_OBJ_NUMANODE, curlgrp, indexes, glob_lgrps, distances, 0 /* OS cannot force */);
} else
#endif /* HAVE_DECL_LGRP_LATENCY_COOKIE */
free(glob_lgrps);
}
lgrp_fini(cookie);
}