4 * $DragonFly: src/test/sysperf/mutex1.c,v 1.2 2006/04/22 22:34:06 dillon Exp $
12 main(int ac, char **av)
20 printf("Test simple locked bus cycle mutex latency\n");
21 printf("auto-forks two processes for the test with shared memory\n");
22 printf("This test is only useful on a SMP box\n");
25 mtx = mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANON, -1, 0);
27 while (stop_timing(0, NULL) == 0) {
28 for (j = 0; j < 100; ++j) {
41 for (count = 0; count < max; count += 100) {
42 for (j = 0; j < 100; ++j) {
43 while (try_spin_mtx() != 0)
45 rel_spin_mtx(); /* release */
49 stop_timing(count, "simple_mtx(uncontested/1cpu)");
51 if ((pid = fork()) == 0) {
53 for (j = 0; j < 100; ++j) {
54 while (try_spin_mtx() != 0)
56 rel_spin_mtx(); /* release */
62 for (count = 0; count < max; count += 100) {
63 for (j = 0; j < 100; ++j) {
64 while (try_spin_mtx() != 0)
66 rel_spin_mtx(); /* release */
70 stop_timing(count, "simple_mtx");
71 printf("proc1=%d proc2=%d\n", counter[64], counter[128]);