c_sublocid_t chpl_topo_getMemLocality(void* p) {
int flags;
hwloc_nodeset_t nodeset;
int node;
if (!haveTopology) {
return c_sublocid_any;
}
if (!topoSupport->membind->get_area_memlocation) {
return c_sublocid_any;
}
if (p == NULL) {
return c_sublocid_any;
}
CHK_ERR_ERRNO((nodeset = hwloc_bitmap_alloc()) != NULL);
flags = HWLOC_MEMBIND_BYNODESET;
CHK_ERR_ERRNO(hwloc_get_area_memlocation(topology, p, 1, nodeset, flags)
== 0);
node = hwloc_bitmap_first(nodeset);
if (!isActualSublocID(node)) {
node = c_sublocid_any;
}
hwloc_bitmap_free(nodeset);
return node;
}
int main(void)
{
const struct hwloc_topology_support *support;
char *buffer;
hwloc_topology_t topology;
hwloc_bitmap_t set = hwloc_bitmap_alloc();
hwloc_bitmap_t total = hwloc_bitmap_alloc();
hwloc_obj_t node;
char *s;
int err;
err = hwloc_topology_init(&topology);
assert(!err);
err = hwloc_topology_load(topology);
assert(!err);
support = hwloc_topology_get_support(topology);
if (!support->membind->get_area_memlocation)
goto out;
buffer = hwloc_alloc(topology, LEN);
assert(buffer);
printf("buffer %p length %u\n", buffer, LEN);
err = hwloc_get_area_memlocation(topology, buffer, LEN, set, HWLOC_MEMBIND_BYNODESET);
if (err < 0 && errno == ENOSYS) {
fprintf(stderr, "hwloc_get_area_memlocation() failed with ENOSYS, aborting\n");
goto out_with_buffer;
}
assert(!err);
hwloc_bitmap_asprintf(&s, set);
printf("address %p length %u allocated in nodeset %s\n", buffer, LEN, s);
free(s);
hwloc_bitmap_copy(total, set);
node = NULL;
next1:
node = hwloc_get_next_obj_by_type(topology, HWLOC_OBJ_NUMANODE, node);
if (!node)
goto out_with_buffer;
if (!node->memory.local_memory)
goto next1;
printf("binding to 1st node and touching 1st quarter\n");
err = hwloc_set_area_membind(topology, buffer, LEN, node->nodeset, HWLOC_MEMBIND_BIND, HWLOC_MEMBIND_BYNODESET);
if (err < 0 && errno == ENOSYS) {
fprintf(stderr, "hwloc_set_area_membind() failed with ENOSYS, aborting\n");
goto out_with_buffer;
}
assert(!err);
memset(buffer, 0, LEN/4);
err = hwloc_get_area_memlocation(topology, buffer, 1, set, HWLOC_MEMBIND_BYNODESET);
assert(!err);
hwloc_bitmap_asprintf(&s, set);
printf("address %p length %u allocated in nodeset %s\n", buffer, LEN/4, s);
free(s);
hwloc_bitmap_or(total, total, set);
next2:
node = hwloc_get_next_obj_by_type(topology, HWLOC_OBJ_NUMANODE, node);
if (!node)
goto out_with_nomorenodes;
if (!node->memory.local_memory)
goto next2;
printf("binding to 2nd node and touching 2nd quarter\n");
err = hwloc_set_area_membind(topology, buffer, LEN, node->nodeset, HWLOC_MEMBIND_BIND, HWLOC_MEMBIND_BYNODESET);
assert(!err);
memset(buffer+LEN/4, 0, LEN/4);
err = hwloc_get_area_memlocation(topology, buffer+LEN/4, LEN/4, set, HWLOC_MEMBIND_BYNODESET);
assert(!err);
hwloc_bitmap_asprintf(&s, set);
printf("address %p length %u allocated in nodeset %s\n", buffer+LEN/4, LEN/4, s);
free(s);
hwloc_bitmap_or(total, total, set);
next3:
node = hwloc_get_next_obj_by_type(topology, HWLOC_OBJ_NUMANODE, node);
if (!node)
goto out_with_nomorenodes;
if (!node->memory.local_memory)
goto next3;
printf("binding to 3rd node and touching 3rd quarter\n");
err = hwloc_set_area_membind(topology, buffer, LEN, node->nodeset, HWLOC_MEMBIND_BIND, HWLOC_MEMBIND_BYNODESET);
assert(!err);
memset(buffer+LEN/2, 0, LEN/4);
err = hwloc_get_area_memlocation(topology, buffer+LEN/2, LEN/4, set, HWLOC_MEMBIND_BYNODESET);
assert(!err);
hwloc_bitmap_asprintf(&s, set);
printf("address %p length %u allocated in nodeset %s\n", buffer+LEN/2, LEN/4, s);
free(s);
hwloc_bitmap_or(total, total, set);
next4:
node = hwloc_get_next_obj_by_type(topology, HWLOC_OBJ_NUMANODE, node);
if (!node)
goto out_with_nomorenodes;
if (!node->memory.local_memory)
goto next4;
printf("binding to 4th node and touching 4th quarter\n");
err = hwloc_set_area_membind(topology, buffer, LEN, node->nodeset, HWLOC_MEMBIND_BIND, HWLOC_MEMBIND_BYNODESET);
assert(!err);
memset(buffer+3*LEN/4, 0, LEN/4);
err = hwloc_get_area_memlocation(topology, buffer+3*LEN/4, LEN/4, set, HWLOC_MEMBIND_BYNODESET);
assert(!err);
hwloc_bitmap_asprintf(&s, set);
printf("address %p length %u allocated in nodeset %s\n", buffer+3*LEN/4, LEN/4, s);
free(s);
hwloc_bitmap_or(total, total, set);
out_with_nomorenodes:
err = hwloc_get_area_memlocation(topology, buffer, LEN, set, HWLOC_MEMBIND_BYNODESET);
assert(!err);
hwloc_bitmap_asprintf(&s, set);
printf("address %p length %u located on %s\n", buffer, LEN, s);
free(s);
assert(hwloc_bitmap_isincluded(total, set));
out_with_buffer:
hwloc_free(topology, buffer, LEN);
out:
hwloc_topology_destroy(topology);
hwloc_bitmap_free(set);
hwloc_bitmap_free(total);
return 0;
}