Root/tools/perf/bench/sched-messaging.c

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 __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

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