93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
// RUN: %libomp-compile
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// RUN: env OMP_DISPLAY_AFFINITY=TRUE OMP_NUM_THREADS=4 OMP_PLACES='{0,1},{2,3},{4,5},{6,7}' %libomp-run | %python %S/check.py -c 'CHECK' %s
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// Affinity Display examples
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#include <stdio.h>
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#include <stdlib.h> // also null is in <stddef.h>
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#include <stddef.h>
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#include <omp.h>
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#include <string.h>
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// ENVIRONMENT
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// OMP_DISPLAY_AFFINITY=TRUE
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// OMP_NUM_THREADS=4
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// OMP_PLACES='{0,1},{2,3},{4,5},{6,7}'
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// CHECK: num_threads=1 OMP: pid [0-9]+ tid [0-9]+ thread [0-4] bound to OS proc set \{([0-7])|(0,1)|(undefined)\}
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// CHECK: num_threads=4 Thread id [0-3] reporting in
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// CHECK: num_threads=4 OMP: pid [0-9]+ tid [0-9]+ thread [0-4] bound to OS proc set \{([0-7])|([0246],[1357])|(undefined)\}
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// CHECK: num_threads=1 Default Affinity Format is:
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// CHECK: num_threads=1 Affinity Format set to: host=%20H tid=%0.4n binds_to=%A
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// CHECK: num_threads=4 tid=[0-3] affinity:host=[a-zA-Z0-9_.-]+[ ]+tid=000[0-4][ ]+binds_to=(([0-7])|([0246],[1357])|(undefined))
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#define FORMAT_STORE 80
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#define BUFFER_STORE 80
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int main(int argc, char** argv) {
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int i, n, tid, max_req_store = 0;
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size_t nchars;
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char default_format[FORMAT_STORE];
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char my_format[] = "host=%20H tid=%0.4n binds_to=%A";
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char **buffer;
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// CODE SEGMENT 1 AFFINITY DISPLAY
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omp_display_affinity(NULL);
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// OMP_DISPLAY_AFFINITY=TRUE,
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// Affinity reported for 1 parallel region
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#pragma omp parallel
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{
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printf("Thread id %d reporting in.\n", omp_get_thread_num());
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}
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// Get and Display Default Affinity Format
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nchars = omp_get_affinity_format(default_format, (size_t)FORMAT_STORE);
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printf("Default Affinity Format is: %s\n", default_format);
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if (nchars > FORMAT_STORE) {
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printf("Caution: Reported Format is truncated. Increase\n");
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printf(" FORMAT_STORE by %d.\n", (int)nchars - FORMAT_STORE);
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}
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// Set Affinity Format
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omp_set_affinity_format(my_format);
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printf("Affinity Format set to: %s\n", my_format);
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// CODE SEGMENT 3 CAPTURE AFFINITY
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// Set up buffer for affinity of n threads
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n = omp_get_max_threads();
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buffer = (char **)malloc(sizeof(char *) * n);
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for (i = 0; i < n; i++) {
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buffer[i] = (char *)malloc(sizeof(char) * BUFFER_STORE);
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}
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// Capture Affinity using Affinity Format set above.
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// Use critical reduction to check size of buffer areas
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#pragma omp parallel private(tid, nchars)
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{
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tid = omp_get_thread_num();
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nchars = omp_capture_affinity(buffer[tid], (size_t)BUFFER_STORE, NULL);
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#pragma omp critical
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{
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if (nchars > max_req_store)
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max_req_store = nchars;
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}
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}
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for (i = 0; i < n; i++) {
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printf("tid=%d affinity:%s:\n", i, buffer[i]);
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}
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// for 4 threads with OMP_PLACES='{0,1},{2,3},{4,5},{6,7}'
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// host=%20H tid=%0.4n binds_to=%A
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// host=<hostname> tid=0000 binds_to=0,1
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// host=<hostname> tid=0001 binds_to=2,3
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// host=<hostname> tid=0002 binds_to=4,5
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// host=<hostname> tid=0003 binds_to=6,7
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if (max_req_store > BUFFER_STORE) {
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printf("Caution: Affinity string truncated. Increase\n");
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printf(" BUFFER_STORE by %d\n", max_req_store - BUFFER_STORE);
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}
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return 0;
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}
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