projects / apple / libpthread.git / blame
| Commit | Line | Data |
|---|---|---|
| 964d3577 A |
1 | #include <dispatch/dispatch.h> |
| 2 | #include <dispatch/private.h> | |
| 3 | #include <stdio.h> | |
| 4 | ||
| 5 | #define NUM 100000 | |
| 6 | static volatile size_t concur; | |
| 7 | static volatile size_t final; | |
| 8 | dispatch_queue_t resultsq; | |
| 9 | dispatch_group_t rgroup; | |
| 10 | ||
| 11 | void finish(void* ctxt) | |
| 12 | { | |
| 13 | int c = (uintptr_t)ctxt; | |
| 14 | if (c > final) final = c; | |
| 15 | } | |
| 16 | ||
| 17 | void work(void* ctxt) | |
| 18 | { | |
| 19 | int c = __sync_add_and_fetch(&concur, 1); | |
| 20 | if (ctxt) { | |
| 21 | usleep(1000); | |
| 22 | } else { | |
| 23 | for (int i=0; i<100000; i++) { | |
| 24 | __asm__ __volatile__ (""); | |
| 25 | } | |
| 26 | } | |
| 27 | dispatch_group_async_f(rgroup, resultsq, (void*)(uintptr_t)c, finish); | |
| 28 | __sync_sub_and_fetch(&concur, 1); | |
| 29 | } | |
| 30 | ||
| 31 | int main(int argc, const char *argv[]) | |
| 32 | { | |
| 33 | size_t i; | |
| 34 | ||
| 35 | rgroup = dispatch_group_create(); | |
| 36 | resultsq = dispatch_queue_create("results", 0); | |
| 37 | dispatch_suspend(resultsq); | |
| 38 | ||
| 39 | dispatch_group_t group = dispatch_group_create(); | |
| 40 | ||
| 41 | final = concur = 0; | |
| 42 | for (i=0; i<NUM; i++) { | |
| 43 | dispatch_group_async_f(group, dispatch_get_global_queue(0, 0), NULL, work); | |
| 44 | } | |
| 45 | ||
| 46 | dispatch_group_wait(group, DISPATCH_TIME_FOREVER); | |
| 47 | dispatch_resume(resultsq); | |
| 48 | ||
| 49 | dispatch_group_wait(rgroup, DISPATCH_TIME_FOREVER); | |
| 50 | printf("max concurrency: %zd threads.\n", final); | |
| 51 | ||
| 52 | dispatch_suspend(resultsq); | |
| 53 | ||
| 54 | /* ******* */ | |
| 55 | ||
| 56 | final = concur = 0; | |
| 57 | for (i=0; i<NUM; i++) { | |
| 58 | dispatch_group_async_f(group, dispatch_get_global_queue(0, 0), (void*)1, work); | |
| 59 | } | |
| 60 | ||
| 61 | dispatch_group_wait(group, DISPATCH_TIME_FOREVER); | |
| 62 | dispatch_resume(resultsq); | |
| 63 | ||
| 64 | dispatch_group_wait(rgroup, DISPATCH_TIME_FOREVER); | |
| 65 | printf("max blocking concurrency: %zd threads.\n", final); | |
| 66 | ||
| 67 | dispatch_suspend(resultsq); | |
| 68 | ||
| 69 | /* ******* */ | |
| 70 | ||
| 71 | final = concur = 0; | |
| 72 | for (i=0; i<NUM; i++) { | |
| 73 | dispatch_group_async_f(group, dispatch_get_global_queue(0, DISPATCH_QUEUE_OVERCOMMIT), NULL, work); | |
| 74 | } | |
| 75 | ||
| 76 | dispatch_group_wait(group, DISPATCH_TIME_FOREVER); | |
| 77 | dispatch_resume(resultsq); | |
| 78 | ||
| 79 | dispatch_group_wait(rgroup, DISPATCH_TIME_FOREVER); | |
| 80 | printf("max overcommit concurrency: %zd threads.\n", final); | |
| 81 | dispatch_suspend(resultsq); | |
| 82 | ||
| 83 | /* ******* */ | |
| 84 | ||
| 85 | final = concur = 0; | |
| 86 | for (i=0; i<NUM; i++) { | |
| 87 | dispatch_group_async_f(group, dispatch_get_global_queue(0, DISPATCH_QUEUE_OVERCOMMIT), (void*)1, work); | |
| 88 | } | |
| 89 | ||
| 90 | dispatch_group_wait(group, DISPATCH_TIME_FOREVER); | |
| 91 | dispatch_resume(resultsq); | |
| 92 | ||
| 93 | dispatch_group_wait(rgroup, DISPATCH_TIME_FOREVER); | |
| 94 | printf("max blocking overcommit concurrency: %zd threads.\n", final); | |
| 95 | ||
| 96 | return 0; | |
| 97 | } |