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 <subcmd/parse-options.h>
14 #include "bench.h"
15
16 /* Test groups of 20 processes spraying to 20 receivers */
17 #include <pthread.h>
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <string.h>
21 #include <errno.h>
22 #include <unistd.h>
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <sys/wait.h>
26 #include <sys/time.h>
27 #include <poll.h>
28 #include <limits.h>
29 #include <err.h>
30 #include <linux/list.h>
31 #include <linux/time64.h>
32
33 #define DATASIZE 100
34
35 static bool use_pipes = false;
36 static unsigned int nr_loops = 100;
37 static bool thread_mode = false;
38 static unsigned int num_groups = 10;
39 static struct list_head sender_contexts = LIST_HEAD_INIT(sender_contexts);
40 static struct list_head receiver_contexts = LIST_HEAD_INIT(receiver_contexts);
41
42 struct sender_context {
43 struct list_head list;
44 unsigned int num_fds;
45 int ready_out;
46 int wakefd;
47 int out_fds[];
48 };
49
50 struct receiver_context {
51 struct list_head list;
52 unsigned int num_packets;
53 int in_fds[2];
54 int ready_out;
55 int wakefd;
56 };
57
fdpair(int fds[2])58 static void fdpair(int fds[2])
59 {
60 if (use_pipes) {
61 if (pipe(fds) == 0)
62 return;
63 } else {
64 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0)
65 return;
66 }
67
68 err(EXIT_FAILURE, use_pipes ? "pipe()" : "socketpair()");
69 }
70
71 /* Block until we're ready to go */
ready(int ready_out,int wakefd)72 static void ready(int ready_out, int wakefd)
73 {
74 struct pollfd pollfd = { .fd = wakefd, .events = POLLIN };
75
76 /* Tell them we're ready. */
77 if (write(ready_out, "R", 1) != 1)
78 err(EXIT_FAILURE, "CLIENT: ready write");
79
80 /* Wait for "GO" signal */
81 if (poll(&pollfd, 1, -1) != 1)
82 err(EXIT_FAILURE, "poll");
83 }
84
85 /* Sender sprays nr_loops messages down each file descriptor */
sender(struct sender_context * ctx)86 static void *sender(struct sender_context *ctx)
87 {
88 char data[DATASIZE];
89 unsigned int i, j;
90
91 ready(ctx->ready_out, ctx->wakefd);
92 memset(data, 'S', sizeof(data));
93
94 /* Now pump to every receiver. */
95 for (i = 0; i < nr_loops; i++) {
96 for (j = 0; j < ctx->num_fds; j++) {
97 int ret, done = 0;
98
99 again:
100 ret = write(ctx->out_fds[j], data + done,
101 sizeof(data)-done);
102 if (ret < 0)
103 err(EXIT_FAILURE, "SENDER: write");
104 done += ret;
105 if (done < DATASIZE)
106 goto again;
107 }
108 }
109
110 return NULL;
111 }
112
113
114 /* One receiver per fd */
receiver(struct receiver_context * ctx)115 static void *receiver(struct receiver_context* ctx)
116 {
117 unsigned int i;
118
119 if (!thread_mode)
120 close(ctx->in_fds[1]);
121
122 /* Wait for start... */
123 ready(ctx->ready_out, ctx->wakefd);
124
125 /* Receive them all */
126 for (i = 0; i < ctx->num_packets; i++) {
127 char data[DATASIZE];
128 int ret, done = 0;
129
130 again:
131 ret = read(ctx->in_fds[0], data + done, DATASIZE - done);
132 if (ret < 0)
133 err(EXIT_FAILURE, "SERVER: read");
134 done += ret;
135 if (done < DATASIZE)
136 goto again;
137 }
138
139 return NULL;
140 }
141
create_worker(void * ctx,void * (* func)(void *))142 static pthread_t create_worker(void *ctx, void *(*func)(void *))
143 {
144 pthread_attr_t attr;
145 pthread_t childid;
146 int ret;
147
148 if (!thread_mode) {
149 /* process mode */
150 /* Fork the receiver. */
151 switch (fork()) {
152 case -1:
153 err(EXIT_FAILURE, "fork()");
154 break;
155 case 0:
156 (*func) (ctx);
157 exit(0);
158 break;
159 default:
160 break;
161 }
162
163 return (pthread_t)0;
164 }
165
166 if (pthread_attr_init(&attr) != 0)
167 err(EXIT_FAILURE, "pthread_attr_init:");
168
169 #ifndef __ia64__
170 if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0)
171 err(EXIT_FAILURE, "pthread_attr_setstacksize");
172 #endif
173
174 ret = pthread_create(&childid, &attr, func, ctx);
175 if (ret != 0)
176 err(EXIT_FAILURE, "pthread_create failed");
177
178 pthread_attr_destroy(&attr);
179 return childid;
180 }
181
reap_worker(pthread_t id)182 static void reap_worker(pthread_t id)
183 {
184 int proc_status;
185 void *thread_status;
186
187 if (!thread_mode) {
188 /* process mode */
189 wait(&proc_status);
190 if (!WIFEXITED(proc_status))
191 exit(1);
192 } else {
193 pthread_join(id, &thread_status);
194 }
195 }
196
197 /* One group of senders and receivers */
group(pthread_t * pth,unsigned int num_fds,int ready_out,int wakefd)198 static unsigned int group(pthread_t *pth,
199 unsigned int num_fds,
200 int ready_out,
201 int wakefd)
202 {
203 unsigned int i;
204 struct sender_context *snd_ctx = malloc(sizeof(struct sender_context)
205 + num_fds * sizeof(int));
206
207 if (!snd_ctx)
208 err(EXIT_FAILURE, "malloc()");
209
210 list_add(&snd_ctx->list, &sender_contexts);
211 for (i = 0; i < num_fds; i++) {
212 int fds[2];
213 struct receiver_context *ctx = malloc(sizeof(*ctx));
214
215 if (!ctx)
216 err(EXIT_FAILURE, "malloc()");
217
218 list_add(&ctx->list, &receiver_contexts);
219
220 /* Create the pipe between client and server */
221 fdpair(fds);
222
223 ctx->num_packets = num_fds * nr_loops;
224 ctx->in_fds[0] = fds[0];
225 ctx->in_fds[1] = fds[1];
226 ctx->ready_out = ready_out;
227 ctx->wakefd = wakefd;
228
229 pth[i] = create_worker(ctx, (void *)receiver);
230
231 snd_ctx->out_fds[i] = fds[1];
232 if (!thread_mode)
233 close(fds[0]);
234 }
235
236 /* Now we have all the fds, fork the senders */
237 for (i = 0; i < num_fds; i++) {
238 snd_ctx->ready_out = ready_out;
239 snd_ctx->wakefd = wakefd;
240 snd_ctx->num_fds = num_fds;
241
242 pth[num_fds+i] = create_worker(snd_ctx, (void *)sender);
243 }
244
245 /* Close the fds we have left */
246 if (!thread_mode)
247 for (i = 0; i < num_fds; i++)
248 close(snd_ctx->out_fds[i]);
249
250 /* Return number of children to reap */
251 return num_fds * 2;
252 }
253
254 static const struct option options[] = {
255 OPT_BOOLEAN('p', "pipe", &use_pipes,
256 "Use pipe() instead of socketpair()"),
257 OPT_BOOLEAN('t', "thread", &thread_mode,
258 "Be multi thread instead of multi process"),
259 OPT_UINTEGER('g', "group", &num_groups, "Specify number of groups"),
260 OPT_UINTEGER('l', "nr_loops", &nr_loops, "Specify the number of loops to run (default: 100)"),
261 OPT_END()
262 };
263
264 static const char * const bench_sched_message_usage[] = {
265 "perf bench sched messaging <options>",
266 NULL
267 };
268
bench_sched_messaging(int argc,const char ** argv)269 int bench_sched_messaging(int argc, const char **argv)
270 {
271 unsigned int i, total_children;
272 struct timeval start, stop, diff;
273 unsigned int num_fds = 20;
274 int readyfds[2], wakefds[2];
275 char dummy;
276 pthread_t *pth_tab;
277 struct sender_context *pos, *n;
278
279 argc = parse_options(argc, argv, options,
280 bench_sched_message_usage, 0);
281
282 pth_tab = malloc(num_fds * 2 * num_groups * sizeof(pthread_t));
283 if (!pth_tab)
284 err(EXIT_FAILURE, "main:malloc()");
285
286 fdpair(readyfds);
287 fdpair(wakefds);
288
289 total_children = 0;
290 for (i = 0; i < num_groups; i++)
291 total_children += group(pth_tab+total_children, num_fds,
292 readyfds[1], wakefds[0]);
293
294 /* Wait for everyone to be ready */
295 for (i = 0; i < total_children; i++)
296 if (read(readyfds[0], &dummy, 1) != 1)
297 err(EXIT_FAILURE, "Reading for readyfds");
298
299 gettimeofday(&start, NULL);
300
301 /* Kick them off */
302 if (write(wakefds[1], &dummy, 1) != 1)
303 err(EXIT_FAILURE, "Writing to start them");
304
305 /* Reap them all */
306 for (i = 0; i < total_children; i++)
307 reap_worker(pth_tab[i]);
308
309 gettimeofday(&stop, NULL);
310
311 timersub(&stop, &start, &diff);
312
313 switch (bench_format) {
314 case BENCH_FORMAT_DEFAULT:
315 printf("# %d sender and receiver %s per group\n",
316 num_fds, thread_mode ? "threads" : "processes");
317 printf("# %d groups == %d %s run\n\n",
318 num_groups, num_groups * 2 * num_fds,
319 thread_mode ? "threads" : "processes");
320 printf(" %14s: %lu.%03lu [sec]\n", "Total time",
321 (unsigned long) diff.tv_sec,
322 (unsigned long) (diff.tv_usec / USEC_PER_MSEC));
323 break;
324 case BENCH_FORMAT_SIMPLE:
325 printf("%lu.%03lu\n", (unsigned long) diff.tv_sec,
326 (unsigned long) (diff.tv_usec / USEC_PER_MSEC));
327 break;
328 default:
329 /* reaching here is something disaster */
330 fprintf(stderr, "Unknown format:%d\n", bench_format);
331 exit(1);
332 break;
333 }
334
335 free(pth_tab);
336 list_for_each_entry_safe(pos, n, &sender_contexts, list) {
337 list_del_init(&pos->list);
338 free(pos);
339 }
340 list_for_each_entry_safe(pos, n, &receiver_contexts, list) {
341 list_del_init(&pos->list);
342 free(pos);
343 }
344 return 0;
345 }
346