This source file includes following definitions.
- workerfn
- toggle_done
- print_summary
- bench_futex_hash
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13 #include <string.h>
14 #include <pthread.h>
15
16 #include <errno.h>
17 #include <signal.h>
18 #include <stdlib.h>
19 #include <linux/compiler.h>
20 #include <linux/kernel.h>
21 #include <linux/zalloc.h>
22 #include <sys/time.h>
23 #include <internal/cpumap.h>
24 #include <perf/cpumap.h>
25
26 #include "../util/stat.h"
27 #include <subcmd/parse-options.h>
28 #include "bench.h"
29 #include "futex.h"
30
31 #include <err.h>
32
33 static unsigned int nthreads = 0;
34 static unsigned int nsecs = 10;
35
36 static unsigned int nfutexes = 1024;
37 static bool fshared = false, done = false, silent = false;
38 static int futex_flag = 0;
39
40 struct timeval start, end, runtime;
41 static pthread_mutex_t thread_lock;
42 static unsigned int threads_starting;
43 static struct stats throughput_stats;
44 static pthread_cond_t thread_parent, thread_worker;
45
46 struct worker {
47 int tid;
48 u_int32_t *futex;
49 pthread_t thread;
50 unsigned long ops;
51 };
52
53 static const struct option options[] = {
54 OPT_UINTEGER('t', "threads", &nthreads, "Specify amount of threads"),
55 OPT_UINTEGER('r', "runtime", &nsecs, "Specify runtime (in seconds)"),
56 OPT_UINTEGER('f', "futexes", &nfutexes, "Specify amount of futexes per threads"),
57 OPT_BOOLEAN( 's', "silent", &silent, "Silent mode: do not display data/details"),
58 OPT_BOOLEAN( 'S', "shared", &fshared, "Use shared futexes instead of private ones"),
59 OPT_END()
60 };
61
62 static const char * const bench_futex_hash_usage[] = {
63 "perf bench futex hash <options>",
64 NULL
65 };
66
67 static void *workerfn(void *arg)
68 {
69 int ret;
70 struct worker *w = (struct worker *) arg;
71 unsigned int i;
72 unsigned long ops = w->ops;
73
74 pthread_mutex_lock(&thread_lock);
75 threads_starting--;
76 if (!threads_starting)
77 pthread_cond_signal(&thread_parent);
78 pthread_cond_wait(&thread_worker, &thread_lock);
79 pthread_mutex_unlock(&thread_lock);
80
81 do {
82 for (i = 0; i < nfutexes; i++, ops++) {
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84
85
86
87
88
89 ret = futex_wait(&w->futex[i], 1234, NULL, futex_flag);
90 if (!silent &&
91 (!ret || errno != EAGAIN || errno != EWOULDBLOCK))
92 warn("Non-expected futex return call");
93 }
94 } while (!done);
95
96 w->ops = ops;
97 return NULL;
98 }
99
100 static void toggle_done(int sig __maybe_unused,
101 siginfo_t *info __maybe_unused,
102 void *uc __maybe_unused)
103 {
104
105 done = true;
106 gettimeofday(&end, NULL);
107 timersub(&end, &start, &runtime);
108 }
109
110 static void print_summary(void)
111 {
112 unsigned long avg = avg_stats(&throughput_stats);
113 double stddev = stddev_stats(&throughput_stats);
114
115 printf("%sAveraged %ld operations/sec (+- %.2f%%), total secs = %d\n",
116 !silent ? "\n" : "", avg, rel_stddev_stats(stddev, avg),
117 (int) runtime.tv_sec);
118 }
119
120 int bench_futex_hash(int argc, const char **argv)
121 {
122 int ret = 0;
123 cpu_set_t cpuset;
124 struct sigaction act;
125 unsigned int i;
126 pthread_attr_t thread_attr;
127 struct worker *worker = NULL;
128 struct perf_cpu_map *cpu;
129
130 argc = parse_options(argc, argv, options, bench_futex_hash_usage, 0);
131 if (argc) {
132 usage_with_options(bench_futex_hash_usage, options);
133 exit(EXIT_FAILURE);
134 }
135
136 cpu = perf_cpu_map__new(NULL);
137 if (!cpu)
138 goto errmem;
139
140 sigfillset(&act.sa_mask);
141 act.sa_sigaction = toggle_done;
142 sigaction(SIGINT, &act, NULL);
143
144 if (!nthreads)
145 nthreads = cpu->nr;
146
147 worker = calloc(nthreads, sizeof(*worker));
148 if (!worker)
149 goto errmem;
150
151 if (!fshared)
152 futex_flag = FUTEX_PRIVATE_FLAG;
153
154 printf("Run summary [PID %d]: %d threads, each operating on %d [%s] futexes for %d secs.\n\n",
155 getpid(), nthreads, nfutexes, fshared ? "shared":"private", nsecs);
156
157 init_stats(&throughput_stats);
158 pthread_mutex_init(&thread_lock, NULL);
159 pthread_cond_init(&thread_parent, NULL);
160 pthread_cond_init(&thread_worker, NULL);
161
162 threads_starting = nthreads;
163 pthread_attr_init(&thread_attr);
164 gettimeofday(&start, NULL);
165 for (i = 0; i < nthreads; i++) {
166 worker[i].tid = i;
167 worker[i].futex = calloc(nfutexes, sizeof(*worker[i].futex));
168 if (!worker[i].futex)
169 goto errmem;
170
171 CPU_ZERO(&cpuset);
172 CPU_SET(cpu->map[i % cpu->nr], &cpuset);
173
174 ret = pthread_attr_setaffinity_np(&thread_attr, sizeof(cpu_set_t), &cpuset);
175 if (ret)
176 err(EXIT_FAILURE, "pthread_attr_setaffinity_np");
177
178 ret = pthread_create(&worker[i].thread, &thread_attr, workerfn,
179 (void *)(struct worker *) &worker[i]);
180 if (ret)
181 err(EXIT_FAILURE, "pthread_create");
182
183 }
184 pthread_attr_destroy(&thread_attr);
185
186 pthread_mutex_lock(&thread_lock);
187 while (threads_starting)
188 pthread_cond_wait(&thread_parent, &thread_lock);
189 pthread_cond_broadcast(&thread_worker);
190 pthread_mutex_unlock(&thread_lock);
191
192 sleep(nsecs);
193 toggle_done(0, NULL, NULL);
194
195 for (i = 0; i < nthreads; i++) {
196 ret = pthread_join(worker[i].thread, NULL);
197 if (ret)
198 err(EXIT_FAILURE, "pthread_join");
199 }
200
201
202 pthread_cond_destroy(&thread_parent);
203 pthread_cond_destroy(&thread_worker);
204 pthread_mutex_destroy(&thread_lock);
205
206 for (i = 0; i < nthreads; i++) {
207 unsigned long t = worker[i].ops/runtime.tv_sec;
208 update_stats(&throughput_stats, t);
209 if (!silent) {
210 if (nfutexes == 1)
211 printf("[thread %2d] futex: %p [ %ld ops/sec ]\n",
212 worker[i].tid, &worker[i].futex[0], t);
213 else
214 printf("[thread %2d] futexes: %p ... %p [ %ld ops/sec ]\n",
215 worker[i].tid, &worker[i].futex[0],
216 &worker[i].futex[nfutexes-1], t);
217 }
218
219 zfree(&worker[i].futex);
220 }
221
222 print_summary();
223
224 free(worker);
225 free(cpu);
226 return ret;
227 errmem:
228 err(EXIT_FAILURE, "calloc");
229 }