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