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
34static bool use_pipes = false;
35static unsigned int loops = 100;
36static bool thread_mode = false;
37static unsigned int num_groups = 10;
38
39struct sender_context {
40	unsigned int num_fds;
41	int ready_out;
42	int wakefd;
43	int out_fds[0];
44};
45
46struct receiver_context {
47	unsigned int num_packets;
48	int in_fds[2];
49	int ready_out;
50	int wakefd;
51};
52
53static void barf(const char *msg)
54{
55	fprintf(stderr, "%s (error: %s)\n", msg, strerror(errno));
56	exit(1);
57}
58
59static 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 */
73static 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 */
88static 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
100again:
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 */
116static 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
131again:
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
143static 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
184static 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 */
200static 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
254static 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
264static const char * const bench_sched_message_usage[] = {
265	"perf bench sched messaging <options>",
266	NULL
267};
268
269int bench_sched_messaging(int argc, const char **argv,
270		    const char *prefix __maybe_unused)
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