GNU Linux-libre 4.19.211-gnu1
[releases.git] / tools / perf / bench / sched-messaging.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *
4  * sched-messaging.c
5  *
6  * messaging: Benchmark for scheduler and IPC mechanisms
7  *
8  * Based on hackbench by Rusty Russell <rusty@rustcorp.com.au>
9  * Ported to perf by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
10  *
11  */
12
13 #include "../perf.h"
14 #include "../util/util.h"
15 #include <subcmd/parse-options.h>
16 #include "../builtin.h"
17 #include "bench.h"
18
19 /* Test groups of 20 processes spraying to 20 receivers */
20 #include <pthread.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <errno.h>
25 #include <unistd.h>
26 #include <sys/types.h>
27 #include <sys/socket.h>
28 #include <sys/wait.h>
29 #include <sys/time.h>
30 #include <poll.h>
31 #include <limits.h>
32 #include <err.h>
33 #include <linux/time64.h>
34
35 #define DATASIZE 100
36
37 static bool use_pipes = false;
38 static unsigned int nr_loops = 100;
39 static bool thread_mode = false;
40 static unsigned int num_groups = 10;
41
42 struct sender_context {
43         unsigned int num_fds;
44         int ready_out;
45         int wakefd;
46         int out_fds[0];
47 };
48
49 struct receiver_context {
50         unsigned int num_packets;
51         int in_fds[2];
52         int ready_out;
53         int wakefd;
54 };
55
56 static void fdpair(int fds[2])
57 {
58         if (use_pipes) {
59                 if (pipe(fds) == 0)
60                         return;
61         } else {
62                 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0)
63                         return;
64         }
65
66         err(EXIT_FAILURE, use_pipes ? "pipe()" : "socketpair()");
67 }
68
69 /* Block until we're ready to go */
70 static void ready(int ready_out, int wakefd)
71 {
72         char dummy;
73         struct pollfd pollfd = { .fd = wakefd, .events = POLLIN };
74
75         /* Tell them we're ready. */
76         if (write(ready_out, &dummy, 1) != 1)
77                 err(EXIT_FAILURE, "CLIENT: ready write");
78
79         /* Wait for "GO" signal */
80         if (poll(&pollfd, 1, -1) != 1)
81                 err(EXIT_FAILURE, "poll");
82 }
83
84 /* Sender sprays nr_loops messages down each file descriptor */
85 static void *sender(struct sender_context *ctx)
86 {
87         char data[DATASIZE];
88         unsigned int i, j;
89
90         ready(ctx->ready_out, ctx->wakefd);
91
92         /* Now pump to every receiver. */
93         for (i = 0; i < nr_loops; i++) {
94                 for (j = 0; j < ctx->num_fds; j++) {
95                         int ret, done = 0;
96
97 again:
98                         ret = write(ctx->out_fds[j], data + done,
99                                     sizeof(data)-done);
100                         if (ret < 0)
101                                 err(EXIT_FAILURE, "SENDER: write");
102                         done += ret;
103                         if (done < DATASIZE)
104                                 goto again;
105                 }
106         }
107
108         return NULL;
109 }
110
111
112 /* One receiver per fd */
113 static void *receiver(struct receiver_context* ctx)
114 {
115         unsigned int i;
116
117         if (!thread_mode)
118                 close(ctx->in_fds[1]);
119
120         /* Wait for start... */
121         ready(ctx->ready_out, ctx->wakefd);
122
123         /* Receive them all */
124         for (i = 0; i < ctx->num_packets; i++) {
125                 char data[DATASIZE];
126                 int ret, done = 0;
127
128 again:
129                 ret = read(ctx->in_fds[0], data + done, DATASIZE - done);
130                 if (ret < 0)
131                         err(EXIT_FAILURE, "SERVER: read");
132                 done += ret;
133                 if (done < DATASIZE)
134                         goto again;
135         }
136
137         return NULL;
138 }
139
140 static pthread_t create_worker(void *ctx, void *(*func)(void *))
141 {
142         pthread_attr_t attr;
143         pthread_t childid;
144         int ret;
145
146         if (!thread_mode) {
147                 /* process mode */
148                 /* Fork the receiver. */
149                 switch (fork()) {
150                 case -1:
151                         err(EXIT_FAILURE, "fork()");
152                         break;
153                 case 0:
154                         (*func) (ctx);
155                         exit(0);
156                         break;
157                 default:
158                         break;
159                 }
160
161                 return (pthread_t)0;
162         }
163
164         if (pthread_attr_init(&attr) != 0)
165                 err(EXIT_FAILURE, "pthread_attr_init:");
166
167 #ifndef __ia64__
168         if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0)
169                 err(EXIT_FAILURE, "pthread_attr_setstacksize");
170 #endif
171
172         ret = pthread_create(&childid, &attr, func, ctx);
173         if (ret != 0)
174                 err(EXIT_FAILURE, "pthread_create failed");
175
176         return childid;
177 }
178
179 static void reap_worker(pthread_t id)
180 {
181         int proc_status;
182         void *thread_status;
183
184         if (!thread_mode) {
185                 /* process mode */
186                 wait(&proc_status);
187                 if (!WIFEXITED(proc_status))
188                         exit(1);
189         } else {
190                 pthread_join(id, &thread_status);
191         }
192 }
193
194 /* One group of senders and receivers */
195 static unsigned int group(pthread_t *pth,
196                 unsigned int num_fds,
197                 int ready_out,
198                 int wakefd)
199 {
200         unsigned int i;
201         struct sender_context *snd_ctx = malloc(sizeof(struct sender_context)
202                         + num_fds * sizeof(int));
203
204         if (!snd_ctx)
205                 err(EXIT_FAILURE, "malloc()");
206
207         for (i = 0; i < num_fds; i++) {
208                 int fds[2];
209                 struct receiver_context *ctx = malloc(sizeof(*ctx));
210
211                 if (!ctx)
212                         err(EXIT_FAILURE, "malloc()");
213
214
215                 /* Create the pipe between client and server */
216                 fdpair(fds);
217
218                 ctx->num_packets = num_fds * nr_loops;
219                 ctx->in_fds[0] = fds[0];
220                 ctx->in_fds[1] = fds[1];
221                 ctx->ready_out = ready_out;
222                 ctx->wakefd = wakefd;
223
224                 pth[i] = create_worker(ctx, (void *)receiver);
225
226                 snd_ctx->out_fds[i] = fds[1];
227                 if (!thread_mode)
228                         close(fds[0]);
229         }
230
231         /* Now we have all the fds, fork the senders */
232         for (i = 0; i < num_fds; i++) {
233                 snd_ctx->ready_out = ready_out;
234                 snd_ctx->wakefd = wakefd;
235                 snd_ctx->num_fds = num_fds;
236
237                 pth[num_fds+i] = create_worker(snd_ctx, (void *)sender);
238         }
239
240         /* Close the fds we have left */
241         if (!thread_mode)
242                 for (i = 0; i < num_fds; i++)
243                         close(snd_ctx->out_fds[i]);
244
245         /* Return number of children to reap */
246         return num_fds * 2;
247 }
248
249 static const struct option options[] = {
250         OPT_BOOLEAN('p', "pipe", &use_pipes,
251                     "Use pipe() instead of socketpair()"),
252         OPT_BOOLEAN('t', "thread", &thread_mode,
253                     "Be multi thread instead of multi process"),
254         OPT_UINTEGER('g', "group", &num_groups, "Specify number of groups"),
255         OPT_UINTEGER('l', "nr_loops", &nr_loops, "Specify the number of loops to run (default: 100)"),
256         OPT_END()
257 };
258
259 static const char * const bench_sched_message_usage[] = {
260         "perf bench sched messaging <options>",
261         NULL
262 };
263
264 int bench_sched_messaging(int argc, const char **argv)
265 {
266         unsigned int i, total_children;
267         struct timeval start, stop, diff;
268         unsigned int num_fds = 20;
269         int readyfds[2], wakefds[2];
270         char dummy;
271         pthread_t *pth_tab;
272
273         argc = parse_options(argc, argv, options,
274                              bench_sched_message_usage, 0);
275
276         pth_tab = malloc(num_fds * 2 * num_groups * sizeof(pthread_t));
277         if (!pth_tab)
278                 err(EXIT_FAILURE, "main:malloc()");
279
280         fdpair(readyfds);
281         fdpair(wakefds);
282
283         total_children = 0;
284         for (i = 0; i < num_groups; i++)
285                 total_children += group(pth_tab+total_children, num_fds,
286                                         readyfds[1], wakefds[0]);
287
288         /* Wait for everyone to be ready */
289         for (i = 0; i < total_children; i++)
290                 if (read(readyfds[0], &dummy, 1) != 1)
291                         err(EXIT_FAILURE, "Reading for readyfds");
292
293         gettimeofday(&start, NULL);
294
295         /* Kick them off */
296         if (write(wakefds[1], &dummy, 1) != 1)
297                 err(EXIT_FAILURE, "Writing to start them");
298
299         /* Reap them all */
300         for (i = 0; i < total_children; i++)
301                 reap_worker(pth_tab[i]);
302
303         gettimeofday(&stop, NULL);
304
305         timersub(&stop, &start, &diff);
306
307         switch (bench_format) {
308         case BENCH_FORMAT_DEFAULT:
309                 printf("# %d sender and receiver %s per group\n",
310                        num_fds, thread_mode ? "threads" : "processes");
311                 printf("# %d groups == %d %s run\n\n",
312                        num_groups, num_groups * 2 * num_fds,
313                        thread_mode ? "threads" : "processes");
314                 printf(" %14s: %lu.%03lu [sec]\n", "Total time",
315                        diff.tv_sec,
316                        (unsigned long) (diff.tv_usec / USEC_PER_MSEC));
317                 break;
318         case BENCH_FORMAT_SIMPLE:
319                 printf("%lu.%03lu\n", diff.tv_sec,
320                        (unsigned long) (diff.tv_usec / USEC_PER_MSEC));
321                 break;
322         default:
323                 /* reaching here is something disaster */
324                 fprintf(stderr, "Unknown format:%d\n", bench_format);
325                 exit(1);
326                 break;
327         }
328
329         free(pth_tab);
330
331         return 0;
332 }