perf/bench/sched-messaging.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  *
0004  * sched-messaging.c
0005  *
0006  * messaging: Benchmark for scheduler and IPC mechanisms
0007  *
0008  * Based on hackbench by Rusty Russell <rusty@rustcorp.com.au>
0009  * Ported to perf by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
0010  *
0011  */
0012
0013 #include <subcmd/parse-options.h>
0014 #include "bench.h"
0015
0016 /* Test groups of 20 processes spraying to 20 receivers */
0017 #include <pthread.h>
0018 #include <stdio.h>
0019 #include <stdlib.h>
0020 #include <string.h>
0021 #include <errno.h>
0022 #include <unistd.h>
0023 #include <sys/types.h>
0024 #include <sys/socket.h>
0025 #include <sys/wait.h>
0026 #include <sys/time.h>
0027 #include <poll.h>
0028 #include <limits.h>
0029 #include <err.h>
0030 #include <linux/time64.h>
0031
0032 #define DATASIZE 100
0033
0034 static bool use_pipes = false;
0035 static unsigned int nr_loops = 100;
0036 static bool thread_mode = false;
0037 static unsigned int num_groups = 10;
0038
0039 struct sender_context {
0040     unsigned int num_fds;
0041     int ready_out;
0042     int wakefd;
0043     int out_fds[];
0044 };
0045
0046 struct receiver_context {
0047     unsigned int num_packets;
0048     int in_fds[2];
0049     int ready_out;
0050     int wakefd;
0051 };
0052
0053 static void fdpair(int fds[2])
0054 {
0055     if (use_pipes) {
0056         if (pipe(fds) == 0)
0057             return;
0058     } else {
0059         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0)
0060             return;
0061     }
0062
0063     err(EXIT_FAILURE, use_pipes ? "pipe()" : "socketpair()");
0064 }
0065
0066 /* Block until we're ready to go */
0067 static void ready(int ready_out, int wakefd)
0068 {
0069     struct pollfd pollfd = { .fd = wakefd, .events = POLLIN };
0070
0071     /* Tell them we're ready. */
0072     if (write(ready_out, "R", 1) != 1)
0073         err(EXIT_FAILURE, "CLIENT: ready write");
0074
0075     /* Wait for "GO" signal */
0076     if (poll(&pollfd, 1, -1) != 1)
0077         err(EXIT_FAILURE, "poll");
0078 }
0079
0080 /* Sender sprays nr_loops messages down each file descriptor */
0081 static void *sender(struct sender_context *ctx)
0082 {
0083     char data[DATASIZE];
0084     unsigned int i, j;
0085
0086     ready(ctx->ready_out, ctx->wakefd);
0087     memset(data, 'S', sizeof(data));
0088
0089     /* Now pump to every receiver. */
0090     for (i = 0; i < nr_loops; i++) {
0091         for (j = 0; j < ctx->num_fds; j++) {
0092             int ret, done = 0;
0093
0094 again:
0095             ret = write(ctx->out_fds[j], data + done,
0096                     sizeof(data)-done);
0097             if (ret < 0)
0098                 err(EXIT_FAILURE, "SENDER: write");
0099             done += ret;
0100             if (done < DATASIZE)
0101                 goto again;
0102         }
0103     }
0104
0105     return NULL;
0106 }
0107
0108
0109 /* One receiver per fd */
0110 static void *receiver(struct receiver_context* ctx)
0111 {
0112     unsigned int i;
0113
0114     if (!thread_mode)
0115         close(ctx->in_fds[1]);
0116
0117     /* Wait for start... */
0118     ready(ctx->ready_out, ctx->wakefd);
0119
0120     /* Receive them all */
0121     for (i = 0; i < ctx->num_packets; i++) {
0122         char data[DATASIZE];
0123         int ret, done = 0;
0124
0125 again:
0126         ret = read(ctx->in_fds[0], data + done, DATASIZE - done);
0127         if (ret < 0)
0128             err(EXIT_FAILURE, "SERVER: read");
0129         done += ret;
0130         if (done < DATASIZE)
0131             goto again;
0132     }
0133
0134     return NULL;
0135 }
0136
0137 static pthread_t create_worker(void *ctx, void *(*func)(void *))
0138 {
0139     pthread_attr_t attr;
0140     pthread_t childid;
0141     int ret;
0142
0143     if (!thread_mode) {
0144         /* process mode */
0145         /* Fork the receiver. */
0146         switch (fork()) {
0147         case -1:
0148             err(EXIT_FAILURE, "fork()");
0149             break;
0150         case 0:
0151             (*func) (ctx);
0152             exit(0);
0153             break;
0154         default:
0155             break;
0156         }
0157
0158         return (pthread_t)0;
0159     }
0160
0161     if (pthread_attr_init(&attr) != 0)
0162         err(EXIT_FAILURE, "pthread_attr_init:");
0163
0164 #ifndef __ia64__
0165     if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0)
0166         err(EXIT_FAILURE, "pthread_attr_setstacksize");
0167 #endif
0168
0169     ret = pthread_create(&childid, &attr, func, ctx);
0170     if (ret != 0)
0171         err(EXIT_FAILURE, "pthread_create failed");
0172
0173     return childid;
0174 }
0175
0176 static void reap_worker(pthread_t id)
0177 {
0178     int proc_status;
0179     void *thread_status;
0180
0181     if (!thread_mode) {
0182         /* process mode */
0183         wait(&proc_status);
0184         if (!WIFEXITED(proc_status))
0185             exit(1);
0186     } else {
0187         pthread_join(id, &thread_status);
0188     }
0189 }
0190
0191 /* One group of senders and receivers */
0192 static unsigned int group(pthread_t *pth,
0193         unsigned int num_fds,
0194         int ready_out,
0195         int wakefd)
0196 {
0197     unsigned int i;
0198     struct sender_context *snd_ctx = malloc(sizeof(struct sender_context)
0199             + num_fds * sizeof(int));
0200
0201     if (!snd_ctx)
0202         err(EXIT_FAILURE, "malloc()");
0203
0204     for (i = 0; i < num_fds; i++) {
0205         int fds[2];
0206         struct receiver_context *ctx = malloc(sizeof(*ctx));
0207
0208         if (!ctx)
0209             err(EXIT_FAILURE, "malloc()");
0210
0211
0212         /* Create the pipe between client and server */
0213         fdpair(fds);
0214
0215         ctx->num_packets = num_fds * nr_loops;
0216         ctx->in_fds[0] = fds[0];
0217         ctx->in_fds[1] = fds[1];
0218         ctx->ready_out = ready_out;
0219         ctx->wakefd = wakefd;
0220
0221         pth[i] = create_worker(ctx, (void *)receiver);
0222
0223         snd_ctx->out_fds[i] = fds[1];
0224         if (!thread_mode)
0225             close(fds[0]);
0226     }
0227
0228     /* Now we have all the fds, fork the senders */
0229     for (i = 0; i < num_fds; i++) {
0230         snd_ctx->ready_out = ready_out;
0231         snd_ctx->wakefd = wakefd;
0232         snd_ctx->num_fds = num_fds;
0233
0234         pth[num_fds+i] = create_worker(snd_ctx, (void *)sender);
0235     }
0236
0237     /* Close the fds we have left */
0238     if (!thread_mode)
0239         for (i = 0; i < num_fds; i++)
0240             close(snd_ctx->out_fds[i]);
0241
0242     /* Return number of children to reap */
0243     return num_fds * 2;
0244 }
0245
0246 static const struct option options[] = {
0247     OPT_BOOLEAN('p', "pipe", &use_pipes,
0248             "Use pipe() instead of socketpair()"),
0249     OPT_BOOLEAN('t', "thread", &thread_mode,
0250             "Be multi thread instead of multi process"),
0251     OPT_UINTEGER('g', "group", &num_groups, "Specify number of groups"),
0252     OPT_UINTEGER('l', "nr_loops", &nr_loops, "Specify the number of loops to run (default: 100)"),
0253     OPT_END()
0254 };
0255
0256 static const char * const bench_sched_message_usage[] = {
0257     "perf bench sched messaging <options>",
0258     NULL
0259 };
0260
0261 int bench_sched_messaging(int argc, const char **argv)
0262 {
0263     unsigned int i, total_children;
0264     struct timeval start, stop, diff;
0265     unsigned int num_fds = 20;
0266     int readyfds[2], wakefds[2];
0267     char dummy;
0268     pthread_t *pth_tab;
0269
0270     argc = parse_options(argc, argv, options,
0271                  bench_sched_message_usage, 0);
0272
0273     pth_tab = malloc(num_fds * 2 * num_groups * sizeof(pthread_t));
0274     if (!pth_tab)
0275         err(EXIT_FAILURE, "main:malloc()");
0276
0277     fdpair(readyfds);
0278     fdpair(wakefds);
0279
0280     total_children = 0;
0281     for (i = 0; i < num_groups; i++)
0282         total_children += group(pth_tab+total_children, num_fds,
0283                     readyfds[1], wakefds[0]);
0284
0285     /* Wait for everyone to be ready */
0286     for (i = 0; i < total_children; i++)
0287         if (read(readyfds[0], &dummy, 1) != 1)
0288             err(EXIT_FAILURE, "Reading for readyfds");
0289
0290     gettimeofday(&start, NULL);
0291
0292     /* Kick them off */
0293     if (write(wakefds[1], &dummy, 1) != 1)
0294         err(EXIT_FAILURE, "Writing to start them");
0295
0296     /* Reap them all */
0297     for (i = 0; i < total_children; i++)
0298         reap_worker(pth_tab[i]);
0299
0300     gettimeofday(&stop, NULL);
0301
0302     timersub(&stop, &start, &diff);
0303
0304     switch (bench_format) {
0305     case BENCH_FORMAT_DEFAULT:
0306         printf("# %d sender and receiver %s per group\n",
0307                num_fds, thread_mode ? "threads" : "processes");
0308         printf("# %d groups == %d %s run\n\n",
0309                num_groups, num_groups * 2 * num_fds,
0310                thread_mode ? "threads" : "processes");
0311         printf(" %14s: %lu.%03lu [sec]\n", "Total time",
0312                (unsigned long) diff.tv_sec,
0313                (unsigned long) (diff.tv_usec / USEC_PER_MSEC));
0314         break;
0315     case BENCH_FORMAT_SIMPLE:
0316         printf("%lu.%03lu\n", (unsigned long) diff.tv_sec,
0317                (unsigned long) (diff.tv_usec / USEC_PER_MSEC));
0318         break;
0319     default:
0320         /* reaching here is something disaster */
0321         fprintf(stderr, "Unknown format:%d\n", bench_format);
0322         exit(1);
0323         break;
0324     }
0325
0326     free(pth_tab);
0327
0328     return 0;
0329 }