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d2f3f5d2 DB |
1 | /* |
2 | * Copyright (C) 2015 Davidlohr Bueso. | |
3 | */ | |
4 | ||
8a158589 | 5 | /* For the CLR_() macros */ |
a0f213e1 | 6 | #include <string.h> |
8a158589 ACM |
7 | #include <pthread.h> |
8 | ||
9c304f6c | 9 | #include <signal.h> |
d2f3f5d2 | 10 | #include "../util/stat.h" |
4b6ab94e | 11 | #include <subcmd/parse-options.h> |
86695f59 | 12 | #include <linux/compiler.h> |
9c304f6c ACM |
13 | #include <linux/kernel.h> |
14 | #include <errno.h> | |
d2f3f5d2 DB |
15 | #include "bench.h" |
16 | #include "futex.h" | |
17 | ||
18 | #include <err.h> | |
19 | #include <stdlib.h> | |
20 | #include <sys/time.h> | |
d2f3f5d2 DB |
21 | |
22 | struct worker { | |
23 | int tid; | |
24 | u_int32_t *futex; | |
25 | pthread_t thread; | |
26 | unsigned long ops; | |
27 | }; | |
28 | ||
29 | static u_int32_t global_futex = 0; | |
30 | static struct worker *worker; | |
31 | static unsigned int nsecs = 10; | |
32 | static bool silent = false, multi = false; | |
33 | static bool done = false, fshared = false; | |
34 | static unsigned int ncpus, nthreads = 0; | |
35 | static int futex_flag = 0; | |
36 | struct timeval start, end, runtime; | |
37 | static pthread_mutex_t thread_lock; | |
38 | static unsigned int threads_starting; | |
39 | static struct stats throughput_stats; | |
40 | static pthread_cond_t thread_parent, thread_worker; | |
41 | ||
42 | static const struct option options[] = { | |
43 | OPT_UINTEGER('t', "threads", &nthreads, "Specify amount of threads"), | |
44 | OPT_UINTEGER('r', "runtime", &nsecs, "Specify runtime (in seconds)"), | |
45 | OPT_BOOLEAN( 'M', "multi", &multi, "Use multiple futexes"), | |
46 | OPT_BOOLEAN( 's', "silent", &silent, "Silent mode: do not display data/details"), | |
47 | OPT_BOOLEAN( 'S', "shared", &fshared, "Use shared futexes instead of private ones"), | |
48 | OPT_END() | |
49 | }; | |
50 | ||
51 | static const char * const bench_futex_lock_pi_usage[] = { | |
9de3ffa1 | 52 | "perf bench futex lock-pi <options>", |
d2f3f5d2 DB |
53 | NULL |
54 | }; | |
55 | ||
56 | static void print_summary(void) | |
57 | { | |
58 | unsigned long avg = avg_stats(&throughput_stats); | |
59 | double stddev = stddev_stats(&throughput_stats); | |
60 | ||
61 | printf("%sAveraged %ld operations/sec (+- %.2f%%), total secs = %d\n", | |
62 | !silent ? "\n" : "", avg, rel_stddev_stats(stddev, avg), | |
63 | (int) runtime.tv_sec); | |
64 | } | |
65 | ||
66 | static void toggle_done(int sig __maybe_unused, | |
67 | siginfo_t *info __maybe_unused, | |
68 | void *uc __maybe_unused) | |
69 | { | |
70 | /* inform all threads that we're done for the day */ | |
71 | done = true; | |
72 | gettimeofday(&end, NULL); | |
73 | timersub(&end, &start, &runtime); | |
74 | } | |
75 | ||
76 | static void *workerfn(void *arg) | |
77 | { | |
78 | struct worker *w = (struct worker *) arg; | |
e2e1680f | 79 | unsigned long ops = w->ops; |
d2f3f5d2 DB |
80 | |
81 | pthread_mutex_lock(&thread_lock); | |
82 | threads_starting--; | |
83 | if (!threads_starting) | |
84 | pthread_cond_signal(&thread_parent); | |
85 | pthread_cond_wait(&thread_worker, &thread_lock); | |
86 | pthread_mutex_unlock(&thread_lock); | |
87 | ||
88 | do { | |
89 | int ret; | |
90 | again: | |
73b1794e | 91 | ret = futex_lock_pi(w->futex, NULL, futex_flag); |
d2f3f5d2 DB |
92 | |
93 | if (ret) { /* handle lock acquisition */ | |
94 | if (!silent) | |
95 | warn("thread %d: Could not lock pi-lock for %p (%d)", | |
96 | w->tid, w->futex, ret); | |
97 | if (done) | |
98 | break; | |
99 | ||
100 | goto again; | |
101 | } | |
102 | ||
103 | usleep(1); | |
104 | ret = futex_unlock_pi(w->futex, futex_flag); | |
105 | if (ret && !silent) | |
106 | warn("thread %d: Could not unlock pi-lock for %p (%d)", | |
107 | w->tid, w->futex, ret); | |
e2e1680f | 108 | ops++; /* account for thread's share of work */ |
d2f3f5d2 DB |
109 | } while (!done); |
110 | ||
e2e1680f | 111 | w->ops = ops; |
d2f3f5d2 DB |
112 | return NULL; |
113 | } | |
114 | ||
115 | static void create_threads(struct worker *w, pthread_attr_t thread_attr) | |
116 | { | |
117 | cpu_set_t cpu; | |
118 | unsigned int i; | |
119 | ||
120 | threads_starting = nthreads; | |
121 | ||
122 | for (i = 0; i < nthreads; i++) { | |
123 | worker[i].tid = i; | |
124 | ||
125 | if (multi) { | |
126 | worker[i].futex = calloc(1, sizeof(u_int32_t)); | |
127 | if (!worker[i].futex) | |
128 | err(EXIT_FAILURE, "calloc"); | |
129 | } else | |
130 | worker[i].futex = &global_futex; | |
131 | ||
132 | CPU_ZERO(&cpu); | |
133 | CPU_SET(i % ncpus, &cpu); | |
134 | ||
135 | if (pthread_attr_setaffinity_np(&thread_attr, sizeof(cpu_set_t), &cpu)) | |
136 | err(EXIT_FAILURE, "pthread_attr_setaffinity_np"); | |
137 | ||
138 | if (pthread_create(&w[i].thread, &thread_attr, workerfn, &worker[i])) | |
139 | err(EXIT_FAILURE, "pthread_create"); | |
140 | } | |
141 | } | |
142 | ||
b0ad8ea6 | 143 | int bench_futex_lock_pi(int argc, const char **argv) |
d2f3f5d2 DB |
144 | { |
145 | int ret = 0; | |
146 | unsigned int i; | |
147 | struct sigaction act; | |
148 | pthread_attr_t thread_attr; | |
149 | ||
150 | argc = parse_options(argc, argv, options, bench_futex_lock_pi_usage, 0); | |
151 | if (argc) | |
152 | goto err; | |
153 | ||
154 | ncpus = sysconf(_SC_NPROCESSORS_ONLN); | |
155 | ||
156 | sigfillset(&act.sa_mask); | |
157 | act.sa_sigaction = toggle_done; | |
158 | sigaction(SIGINT, &act, NULL); | |
159 | ||
160 | if (!nthreads) | |
161 | nthreads = ncpus; | |
162 | ||
163 | worker = calloc(nthreads, sizeof(*worker)); | |
164 | if (!worker) | |
165 | err(EXIT_FAILURE, "calloc"); | |
166 | ||
167 | if (!fshared) | |
168 | futex_flag = FUTEX_PRIVATE_FLAG; | |
169 | ||
170 | printf("Run summary [PID %d]: %d threads doing pi lock/unlock pairing for %d secs.\n\n", | |
171 | getpid(), nthreads, nsecs); | |
172 | ||
173 | init_stats(&throughput_stats); | |
174 | pthread_mutex_init(&thread_lock, NULL); | |
175 | pthread_cond_init(&thread_parent, NULL); | |
176 | pthread_cond_init(&thread_worker, NULL); | |
177 | ||
178 | threads_starting = nthreads; | |
179 | pthread_attr_init(&thread_attr); | |
180 | gettimeofday(&start, NULL); | |
181 | ||
182 | create_threads(worker, thread_attr); | |
183 | pthread_attr_destroy(&thread_attr); | |
184 | ||
185 | pthread_mutex_lock(&thread_lock); | |
186 | while (threads_starting) | |
187 | pthread_cond_wait(&thread_parent, &thread_lock); | |
188 | pthread_cond_broadcast(&thread_worker); | |
189 | pthread_mutex_unlock(&thread_lock); | |
190 | ||
191 | sleep(nsecs); | |
192 | toggle_done(0, NULL, NULL); | |
193 | ||
194 | for (i = 0; i < nthreads; i++) { | |
195 | ret = pthread_join(worker[i].thread, NULL); | |
196 | if (ret) | |
197 | err(EXIT_FAILURE, "pthread_join"); | |
198 | } | |
199 | ||
200 | /* cleanup & report results */ | |
201 | pthread_cond_destroy(&thread_parent); | |
202 | pthread_cond_destroy(&thread_worker); | |
203 | pthread_mutex_destroy(&thread_lock); | |
204 | ||
205 | for (i = 0; i < nthreads; i++) { | |
206 | unsigned long t = worker[i].ops/runtime.tv_sec; | |
207 | ||
208 | update_stats(&throughput_stats, t); | |
209 | if (!silent) | |
210 | printf("[thread %3d] futex: %p [ %ld ops/sec ]\n", | |
211 | worker[i].tid, worker[i].futex, t); | |
212 | ||
213 | if (multi) | |
214 | free(worker[i].futex); | |
215 | } | |
216 | ||
217 | print_summary(); | |
218 | ||
219 | free(worker); | |
220 | return ret; | |
221 | err: | |
222 | usage_with_options(bench_futex_lock_pi_usage, options); | |
223 | exit(EXIT_FAILURE); | |
224 | } |