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// RUN: %libomp-compile -D_GNU_SOURCE
// RUN: env OMP_PLACES=threads %libomp-run
// RUN: env OMP_PLACES=cores %libomp-run
// RUN: env OMP_PLACES=sockets %libomp-run
// REQUIRES: linux
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libomp_test_affinity.h"
#include "libomp_test_topology.h"
// Check openmp place list to make sure it follow KMP_HW_SUBSET restriction
static int compare_hw_subset_places(const place_list_t *openmp_places,
topology_obj_type_t type, int nsockets,
int ncores_per_socket,
int nthreads_per_core) {
int i, j, expected_total, expected_per_place;
if (type == TOPOLOGY_OBJ_THREAD) {
expected_total = nsockets * ncores_per_socket * nthreads_per_core;
expected_per_place = 1;
} else if (type == TOPOLOGY_OBJ_CORE) {
expected_total = nsockets * ncores_per_socket;
expected_per_place = nthreads_per_core;
} else {
expected_total = nsockets;
expected_per_place = ncores_per_socket;
}
if (openmp_places->num_places != expected_total) {
fprintf(stderr, "error: KMP_HW_SUBSET did not half each resource layer!\n");
printf("openmp_places places:\n");
topology_print_places(openmp_places);
printf("\n");
return EXIT_FAILURE;
}
for (i = 0; i < openmp_places->num_places; ++i) {
int count = affinity_mask_count(openmp_places->masks[i]);
if (count != expected_per_place) {
fprintf(stderr, "error: place %d has %d OS procs instead of %d\n", i,
count, expected_per_place);
return EXIT_FAILURE;
}
}
return EXIT_SUCCESS;
}
static int check_places() {
char buf[100];
topology_obj_type_t type;
const char *value;
int status = EXIT_SUCCESS;
place_list_t *threads, *cores, *sockets, *openmp_places;
threads = topology_alloc_type_places(TOPOLOGY_OBJ_THREAD);
cores = topology_alloc_type_places(TOPOLOGY_OBJ_CORE);
sockets = topology_alloc_type_places(TOPOLOGY_OBJ_SOCKET);
if (threads->num_places <= 1) {
printf("Only one hardware thread to execute on. Skipping test.\n");
return status;
}
value = getenv("OMP_PLACES");
if (!value) {
fprintf(stderr,
"error: OMP_PLACES must be set to one of threads,cores,sockets!\n");
return EXIT_FAILURE;
}
if (strcmp(value, "threads") == 0)
type = TOPOLOGY_OBJ_THREAD;
else if (strcmp(value, "cores") == 0)
type = TOPOLOGY_OBJ_CORE;
else if (strcmp(value, "sockets") == 0)
type = TOPOLOGY_OBJ_SOCKET;
else {
fprintf(stderr,
"error: OMP_PLACES must be one of threads,cores,sockets!\n");
return EXIT_FAILURE;
}
// Calculate of num threads per core, num cores per socket, & num sockets
if (cores->num_places <= 0) {
printf("Invalid number of cores (%d). Skipping test.\n", cores->num_places);
return status;
} else if (sockets->num_places <= 0) {
printf("Invalid number of sockets (%d). Skipping test.\n",
cores->num_places);
return status;
}
int nthreads_per_core = threads->num_places / cores->num_places;
int ncores_per_socket = cores->num_places / sockets->num_places;
int nsockets = sockets->num_places;
if (nsockets * ncores_per_socket * nthreads_per_core != threads->num_places) {
printf("Only uniform topologies can be tested. Skipping test.\n");
return status;
}
// Use half the resources of every level
if (nthreads_per_core > 1)
nthreads_per_core /= 2;
if (ncores_per_socket > 1)
ncores_per_socket /= 2;
if (nsockets > 1)
nsockets /= 2;
snprintf(buf, sizeof(buf), "%ds,%dc,%dt", nsockets, ncores_per_socket,
nthreads_per_core);
setenv("KMP_HW_SUBSET", buf, 1);
openmp_places = topology_alloc_openmp_places();
status = compare_hw_subset_places(openmp_places, type, nsockets,
ncores_per_socket, nthreads_per_core);
topology_free_places(threads);
topology_free_places(cores);
topology_free_places(sockets);
topology_free_places(openmp_places);
return status;
}
int main() {
if (!topology_using_full_mask()) {
printf("Thread does not have access to all logical processors. Skipping "
"test.\n");
return EXIT_SUCCESS;
}
return check_places();
}
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