Commit | Line | Data |
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d2f3f5d2 DB |
1 | /* |
2 | * Copyright (C) 2015 Davidlohr Bueso. | |
3 | */ | |
4 | ||
8a158589 ACM |
5 | /* For the CLR_() macros */ |
6 | #include <pthread.h> | |
7 | ||
d2f3f5d2 DB |
8 | #include "../perf.h" |
9 | #include "../util/util.h" | |
10 | #include "../util/stat.h" | |
4b6ab94e | 11 | #include <subcmd/parse-options.h> |
d2f3f5d2 DB |
12 | #include "../util/header.h" |
13 | #include "bench.h" | |
14 | #include "futex.h" | |
15 | ||
16 | #include <err.h> | |
17 | #include <stdlib.h> | |
18 | #include <sys/time.h> | |
d2f3f5d2 DB |
19 | |
20 | struct worker { | |
21 | int tid; | |
22 | u_int32_t *futex; | |
23 | pthread_t thread; | |
24 | unsigned long ops; | |
25 | }; | |
26 | ||
27 | static u_int32_t global_futex = 0; | |
28 | static struct worker *worker; | |
29 | static unsigned int nsecs = 10; | |
30 | static bool silent = false, multi = false; | |
31 | static bool done = false, fshared = false; | |
32 | static unsigned int ncpus, nthreads = 0; | |
33 | static int futex_flag = 0; | |
34 | struct timeval start, end, runtime; | |
35 | static pthread_mutex_t thread_lock; | |
36 | static unsigned int threads_starting; | |
37 | static struct stats throughput_stats; | |
38 | static pthread_cond_t thread_parent, thread_worker; | |
39 | ||
40 | static const struct option options[] = { | |
41 | OPT_UINTEGER('t', "threads", &nthreads, "Specify amount of threads"), | |
42 | OPT_UINTEGER('r', "runtime", &nsecs, "Specify runtime (in seconds)"), | |
43 | OPT_BOOLEAN( 'M', "multi", &multi, "Use multiple futexes"), | |
44 | OPT_BOOLEAN( 's', "silent", &silent, "Silent mode: do not display data/details"), | |
45 | OPT_BOOLEAN( 'S', "shared", &fshared, "Use shared futexes instead of private ones"), | |
46 | OPT_END() | |
47 | }; | |
48 | ||
49 | static const char * const bench_futex_lock_pi_usage[] = { | |
50 | "perf bench futex requeue <options>", | |
51 | NULL | |
52 | }; | |
53 | ||
54 | static void print_summary(void) | |
55 | { | |
56 | unsigned long avg = avg_stats(&throughput_stats); | |
57 | double stddev = stddev_stats(&throughput_stats); | |
58 | ||
59 | printf("%sAveraged %ld operations/sec (+- %.2f%%), total secs = %d\n", | |
60 | !silent ? "\n" : "", avg, rel_stddev_stats(stddev, avg), | |
61 | (int) runtime.tv_sec); | |
62 | } | |
63 | ||
64 | static void toggle_done(int sig __maybe_unused, | |
65 | siginfo_t *info __maybe_unused, | |
66 | void *uc __maybe_unused) | |
67 | { | |
68 | /* inform all threads that we're done for the day */ | |
69 | done = true; | |
70 | gettimeofday(&end, NULL); | |
71 | timersub(&end, &start, &runtime); | |
72 | } | |
73 | ||
74 | static void *workerfn(void *arg) | |
75 | { | |
76 | struct worker *w = (struct worker *) arg; | |
77 | ||
78 | pthread_mutex_lock(&thread_lock); | |
79 | threads_starting--; | |
80 | if (!threads_starting) | |
81 | pthread_cond_signal(&thread_parent); | |
82 | pthread_cond_wait(&thread_worker, &thread_lock); | |
83 | pthread_mutex_unlock(&thread_lock); | |
84 | ||
85 | do { | |
86 | int ret; | |
87 | again: | |
73b1794e | 88 | ret = futex_lock_pi(w->futex, NULL, futex_flag); |
d2f3f5d2 DB |
89 | |
90 | if (ret) { /* handle lock acquisition */ | |
91 | if (!silent) | |
92 | warn("thread %d: Could not lock pi-lock for %p (%d)", | |
93 | w->tid, w->futex, ret); | |
94 | if (done) | |
95 | break; | |
96 | ||
97 | goto again; | |
98 | } | |
99 | ||
100 | usleep(1); | |
101 | ret = futex_unlock_pi(w->futex, futex_flag); | |
102 | if (ret && !silent) | |
103 | warn("thread %d: Could not unlock pi-lock for %p (%d)", | |
104 | w->tid, w->futex, ret); | |
105 | w->ops++; /* account for thread's share of work */ | |
106 | } while (!done); | |
107 | ||
108 | return NULL; | |
109 | } | |
110 | ||
111 | static void create_threads(struct worker *w, pthread_attr_t thread_attr) | |
112 | { | |
113 | cpu_set_t cpu; | |
114 | unsigned int i; | |
115 | ||
116 | threads_starting = nthreads; | |
117 | ||
118 | for (i = 0; i < nthreads; i++) { | |
119 | worker[i].tid = i; | |
120 | ||
121 | if (multi) { | |
122 | worker[i].futex = calloc(1, sizeof(u_int32_t)); | |
123 | if (!worker[i].futex) | |
124 | err(EXIT_FAILURE, "calloc"); | |
125 | } else | |
126 | worker[i].futex = &global_futex; | |
127 | ||
128 | CPU_ZERO(&cpu); | |
129 | CPU_SET(i % ncpus, &cpu); | |
130 | ||
131 | if (pthread_attr_setaffinity_np(&thread_attr, sizeof(cpu_set_t), &cpu)) | |
132 | err(EXIT_FAILURE, "pthread_attr_setaffinity_np"); | |
133 | ||
134 | if (pthread_create(&w[i].thread, &thread_attr, workerfn, &worker[i])) | |
135 | err(EXIT_FAILURE, "pthread_create"); | |
136 | } | |
137 | } | |
138 | ||
139 | int bench_futex_lock_pi(int argc, const char **argv, | |
140 | const char *prefix __maybe_unused) | |
141 | { | |
142 | int ret = 0; | |
143 | unsigned int i; | |
144 | struct sigaction act; | |
145 | pthread_attr_t thread_attr; | |
146 | ||
147 | argc = parse_options(argc, argv, options, bench_futex_lock_pi_usage, 0); | |
148 | if (argc) | |
149 | goto err; | |
150 | ||
151 | ncpus = sysconf(_SC_NPROCESSORS_ONLN); | |
152 | ||
153 | sigfillset(&act.sa_mask); | |
154 | act.sa_sigaction = toggle_done; | |
155 | sigaction(SIGINT, &act, NULL); | |
156 | ||
157 | if (!nthreads) | |
158 | nthreads = ncpus; | |
159 | ||
160 | worker = calloc(nthreads, sizeof(*worker)); | |
161 | if (!worker) | |
162 | err(EXIT_FAILURE, "calloc"); | |
163 | ||
164 | if (!fshared) | |
165 | futex_flag = FUTEX_PRIVATE_FLAG; | |
166 | ||
167 | printf("Run summary [PID %d]: %d threads doing pi lock/unlock pairing for %d secs.\n\n", | |
168 | getpid(), nthreads, nsecs); | |
169 | ||
170 | init_stats(&throughput_stats); | |
171 | pthread_mutex_init(&thread_lock, NULL); | |
172 | pthread_cond_init(&thread_parent, NULL); | |
173 | pthread_cond_init(&thread_worker, NULL); | |
174 | ||
175 | threads_starting = nthreads; | |
176 | pthread_attr_init(&thread_attr); | |
177 | gettimeofday(&start, NULL); | |
178 | ||
179 | create_threads(worker, thread_attr); | |
180 | pthread_attr_destroy(&thread_attr); | |
181 | ||
182 | pthread_mutex_lock(&thread_lock); | |
183 | while (threads_starting) | |
184 | pthread_cond_wait(&thread_parent, &thread_lock); | |
185 | pthread_cond_broadcast(&thread_worker); | |
186 | pthread_mutex_unlock(&thread_lock); | |
187 | ||
188 | sleep(nsecs); | |
189 | toggle_done(0, NULL, NULL); | |
190 | ||
191 | for (i = 0; i < nthreads; i++) { | |
192 | ret = pthread_join(worker[i].thread, NULL); | |
193 | if (ret) | |
194 | err(EXIT_FAILURE, "pthread_join"); | |
195 | } | |
196 | ||
197 | /* cleanup & report results */ | |
198 | pthread_cond_destroy(&thread_parent); | |
199 | pthread_cond_destroy(&thread_worker); | |
200 | pthread_mutex_destroy(&thread_lock); | |
201 | ||
202 | for (i = 0; i < nthreads; i++) { | |
203 | unsigned long t = worker[i].ops/runtime.tv_sec; | |
204 | ||
205 | update_stats(&throughput_stats, t); | |
206 | if (!silent) | |
207 | printf("[thread %3d] futex: %p [ %ld ops/sec ]\n", | |
208 | worker[i].tid, worker[i].futex, t); | |
209 | ||
210 | if (multi) | |
211 | free(worker[i].futex); | |
212 | } | |
213 | ||
214 | print_summary(); | |
215 | ||
216 | free(worker); | |
217 | return ret; | |
218 | err: | |
219 | usage_with_options(bench_futex_lock_pi_usage, options); | |
220 | exit(EXIT_FAILURE); | |
221 | } |