1 /*
2  *
3  * sched-messaging.c
4  *
5  * messaging: Benchmark for scheduler and IPC mechanisms
6  *
7  * Based on hackbench by Rusty Russell <rusty@rustcorp.com.au>
8  * Ported to perf by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
9  *
10  */
11 
12 #include "../perf.h"
13 #include "../util/util.h"
14 #include "../util/parse-options.h"
15 #include "../builtin.h"
16 #include "bench.h"
17 
18 /* Test groups of 20 processes spraying to 20 receivers */
19 #include <pthread.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <errno.h>
24 #include <unistd.h>
25 #include <sys/types.h>
26 #include <sys/socket.h>
27 #include <sys/wait.h>
28 #include <sys/time.h>
29 #include <sys/poll.h>
30 #include <limits.h>
31 
32 #define DATASIZE 100
33 
34 static bool use_pipes = false;
35 static unsigned int 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[0];
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 barf(const char *msg)
54 {
55 	fprintf(stderr, "%s (error: %s)\n", msg, strerror(errno));
56 	exit(1);
57 }
58 
59 static void fdpair(int fds[2])
60 {
61 	if (use_pipes) {
62 		if (pipe(fds) == 0)
63 			return;
64 	} else {
65 		if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0)
66 			return;
67 	}
68 
69 	barf(use_pipes ? "pipe()" : "socketpair()");
70 }
71 
72 /* Block until we're ready to go */
73 static void ready(int ready_out, int wakefd)
74 {
75 	char dummy;
76 	struct pollfd pollfd = { .fd = wakefd, .events = POLLIN };
77 
78 	/* Tell them we're ready. */
79 	if (write(ready_out, &dummy, 1) != 1)
80 		barf("CLIENT: ready write");
81 
82 	/* Wait for "GO" signal */
83 	if (poll(&pollfd, 1, -1) != 1)
84 		barf("poll");
85 }
86 
87 /* Sender sprays loops messages down each file descriptor */
88 static void *sender(struct sender_context *ctx)
89 {
90 	char data[DATASIZE];
91 	unsigned int i, j;
92 
93 	ready(ctx->ready_out, ctx->wakefd);
94 
95 	/* Now pump to every receiver. */
96 	for (i = 0; i < loops; i++) {
97 		for (j = 0; j < ctx->num_fds; j++) {
98 			int ret, done = 0;
99 
100 again:
101 			ret = write(ctx->out_fds[j], data + done,
102 				    sizeof(data)-done);
103 			if (ret < 0)
104 				barf("SENDER: write");
105 			done += ret;
106 			if (done < DATASIZE)
107 				goto again;
108 		}
109 	}
110 
111 	return NULL;
112 }
113 
114 
115 /* One receiver per fd */
116 static void *receiver(struct receiver_context* ctx)
117 {
118 	unsigned int i;
119 
120 	if (!thread_mode)
121 		close(ctx->in_fds[1]);
122 
123 	/* Wait for start... */
124 	ready(ctx->ready_out, ctx->wakefd);
125 
126 	/* Receive them all */
127 	for (i = 0; i < ctx->num_packets; i++) {
128 		char data[DATASIZE];
129 		int ret, done = 0;
130 
131 again:
132 		ret = read(ctx->in_fds[0], data + done, DATASIZE - done);
133 		if (ret < 0)
134 			barf("SERVER: read");
135 		done += ret;
136 		if (done < DATASIZE)
137 			goto again;
138 	}
139 
140 	return NULL;
141 }
142 
143 static pthread_t create_worker(void *ctx, void *(*func)(void *))
144 {
145 	pthread_attr_t attr;
146 	pthread_t childid;
147 	int err;
148 
149 	if (!thread_mode) {
150 		/* process mode */
151 		/* Fork the receiver. */
152 		switch (fork()) {
153 		case -1:
154 			barf("fork()");
155 			break;
156 		case 0:
157 			(*func) (ctx);
158 			exit(0);
159 			break;
160 		default:
161 			break;
162 		}
163 
164 		return (pthread_t)0;
165 	}
166 
167 	if (pthread_attr_init(&attr) != 0)
168 		barf("pthread_attr_init:");
169 
170 #ifndef __ia64__
171 	if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0)
172 		barf("pthread_attr_setstacksize");
173 #endif
174 
175 	err = pthread_create(&childid, &attr, func, ctx);
176 	if (err != 0) {
177 		fprintf(stderr, "pthread_create failed: %s (%d)\n",
178 			strerror(err), err);
179 		exit(-1);
180 	}
181 	return childid;
182 }
183 
184 static void reap_worker(pthread_t id)
185 {
186 	int proc_status;
187 	void *thread_status;
188 
189 	if (!thread_mode) {
190 		/* process mode */
191 		wait(&proc_status);
192 		if (!WIFEXITED(proc_status))
193 			exit(1);
194 	} else {
195 		pthread_join(id, &thread_status);
196 	}
197 }
198 
199 /* One group of senders and receivers */
200 static unsigned int group(pthread_t *pth,
201 		unsigned int num_fds,
202 		int ready_out,
203 		int wakefd)
204 {
205 	unsigned int i;
206 	struct sender_context *snd_ctx = malloc(sizeof(struct sender_context)
207 			+ num_fds * sizeof(int));
208 
209 	if (!snd_ctx)
210 		barf("malloc()");
211 
212 	for (i = 0; i < num_fds; i++) {
213 		int fds[2];
214 		struct receiver_context *ctx = malloc(sizeof(*ctx));
215 
216 		if (!ctx)
217 			barf("malloc()");
218 
219 
220 		/* Create the pipe between client and server */
221 		fdpair(fds);
222 
223 		ctx->num_packets = num_fds * 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', "loop", &loops, "Specify number of loops"),
261 	OPT_END()
262 };
263 
264 static const char * const bench_sched_message_usage[] = {
265 	"perf bench sched messaging <options>",
266 	NULL
267 };
268 
269 int bench_sched_messaging(int argc, const char **argv,
270 		    const char *prefix __used)
271 {
272 	unsigned int i, total_children;
273 	struct timeval start, stop, diff;
274 	unsigned int num_fds = 20;
275 	int readyfds[2], wakefds[2];
276 	char dummy;
277 	pthread_t *pth_tab;
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 		barf("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 			barf("Reading for readyfds");
298 
299 	gettimeofday(&start, NULL);
300 
301 	/* Kick them off */
302 	if (write(wakefds[1], &dummy, 1) != 1)
303 		barf("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 		       diff.tv_sec,
322 		       (unsigned long) (diff.tv_usec/1000));
323 		break;
324 	case BENCH_FORMAT_SIMPLE:
325 		printf("%lu.%03lu\n", diff.tv_sec,
326 		       (unsigned long) (diff.tv_usec/1000));
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 	return 0;
336 }
337