tools/perf/bench/sched-messaging.c

   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 "../perf.h"
  14 #include "../util/util.h"
  15 #include <subcmd/parse-options.h>
  16 #include "../builtin.h"
  17 #include "bench.h"
  18
  19 /* Test groups of 20 processes spraying to 20 receivers */
  20 #include <pthread.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <sys/types.h>
  27 #include <sys/socket.h>
  28 #include <sys/wait.h>
  29 #include <sys/time.h>
  30 #include <poll.h>
  31 #include <limits.h>
  32 #include <err.h>
  33 #include <linux/time64.h>
  34
  35 #define DATASIZE 100
  36
  37 static bool use_pipes = false;
  38 static unsigned int nr_loops = 100;
  39 static bool thread_mode = false;
  40 static unsigned int num_groups = 10;
  41
  42 struct sender_context {
  43         unsigned int num_fds;
  44         int ready_out;
  45         int wakefd;
  46         int out_fds[0];
  47 };
  48
  49 struct receiver_context {
  50         unsigned int num_packets;
  51         int in_fds[2];
  52         int ready_out;
  53         int wakefd;
  54 };
  55
  56 static void fdpair(int fds[2])
  57 {
  58         if (use_pipes) {
  59                 if (pipe(fds) == 0)
  60                         return;
  61         } else {
  62                 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0)
  63                         return;
  64         }
  65
  66         err(EXIT_FAILURE, use_pipes ? "pipe()" : "socketpair()");
  67 }
  68
  69 /* Block until we're ready to go */
  70 static void ready(int ready_out, int wakefd)
  71 {
  72         char dummy;
  73         struct pollfd pollfd = { .fd = wakefd, .events = POLLIN };
  74
  75         /* Tell them we're ready. */
  76         if (write(ready_out, &dummy, 1) != 1)
  77                 err(EXIT_FAILURE, "CLIENT: ready write");
  78
  79         /* Wait for "GO" signal */
  80         if (poll(&pollfd, 1, -1) != 1)
  81                 err(EXIT_FAILURE, "poll");
  82 }
  83
  84 /* Sender sprays nr_loops messages down each file descriptor */
  85 static void *sender(struct sender_context *ctx)
  86 {
  87         char data[DATASIZE];
  88         unsigned int i, j;
  89
  90         ready(ctx->ready_out, ctx->wakefd);
  91
  92         /* Now pump to every receiver. */
  93         for (i = 0; i < nr_loops; i++) {
  94                 for (j = 0; j < ctx->num_fds; j++) {
  95                         int ret, done = 0;
  96
  97 again:
  98                         ret = write(ctx->out_fds[j], data + done,
  99                                     sizeof(data)-done);
 100                         if (ret < 0)
 101                                 err(EXIT_FAILURE, "SENDER: write");
 102                         done += ret;
 103                         if (done < DATASIZE)
 104                                 goto again;
 105                 }
 106         }
 107
 108         return NULL;
 109 }
 110
 111
 112 /* One receiver per fd */
 113 static void *receiver(struct receiver_context* ctx)
 114 {
 115         unsigned int i;
 116
 117         if (!thread_mode)
 118                 close(ctx->in_fds[1]);
 119
 120         /* Wait for start... */
 121         ready(ctx->ready_out, ctx->wakefd);
 122
 123         /* Receive them all */
 124         for (i = 0; i < ctx->num_packets; i++) {
 125                 char data[DATASIZE];
 126                 int ret, done = 0;
 127
 128 again:
 129                 ret = read(ctx->in_fds[0], data + done, DATASIZE - done);
 130                 if (ret < 0)
 131                         err(EXIT_FAILURE, "SERVER: read");
 132                 done += ret;
 133                 if (done < DATASIZE)
 134                         goto again;
 135         }
 136
 137         return NULL;
 138 }
 139
 140 static pthread_t create_worker(void *ctx, void *(*func)(void *))
 141 {
 142         pthread_attr_t attr;
 143         pthread_t childid;
 144         int ret;
 145
 146         if (!thread_mode) {
 147                 /* process mode */
 148                 /* Fork the receiver. */
 149                 switch (fork()) {
 150                 case -1:
 151                         err(EXIT_FAILURE, "fork()");
 152                         break;
 153                 case 0:
 154                         (*func) (ctx);
 155                         exit(0);
 156                         break;
 157                 default:
 158                         break;
 159                 }
 160
 161                 return (pthread_t)0;
 162         }
 163
 164         if (pthread_attr_init(&attr) != 0)
 165                 err(EXIT_FAILURE, "pthread_attr_init:");
 166
 167 #ifndef __ia64__
 168         if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0)
 169                 err(EXIT_FAILURE, "pthread_attr_setstacksize");
 170 #endif
 171
 172         ret = pthread_create(&childid, &attr, func, ctx);
 173         if (ret != 0)
 174                 err(EXIT_FAILURE, "pthread_create failed");
 175
 176         return childid;
 177 }
 178
 179 static void reap_worker(pthread_t id)
 180 {
 181         int proc_status;
 182         void *thread_status;
 183
 184         if (!thread_mode) {
 185                 /* process mode */
 186                 wait(&proc_status);
 187                 if (!WIFEXITED(proc_status))
 188                         exit(1);
 189         } else {
 190                 pthread_join(id, &thread_status);
 191         }
 192 }
 193
 194 /* One group of senders and receivers */
 195 static unsigned int group(pthread_t *pth,
 196                 unsigned int num_fds,
 197                 int ready_out,
 198                 int wakefd)
 199 {
 200         unsigned int i;
 201         struct sender_context *snd_ctx = malloc(sizeof(struct sender_context)
 202                         + num_fds * sizeof(int));
 203
 204         if (!snd_ctx)
 205                 err(EXIT_FAILURE, "malloc()");
 206
 207         for (i = 0; i < num_fds; i++) {
 208                 int fds[2];
 209                 struct receiver_context *ctx = malloc(sizeof(*ctx));
 210
 211                 if (!ctx)
 212                         err(EXIT_FAILURE, "malloc()");
 213
 214
 215                 /* Create the pipe between client and server */
 216                 fdpair(fds);
 217
 218                 ctx->num_packets = num_fds * nr_loops;
 219                 ctx->in_fds[0] = fds[0];
 220                 ctx->in_fds[1] = fds[1];
 221                 ctx->ready_out = ready_out;
 222                 ctx->wakefd = wakefd;
 223
 224                 pth[i] = create_worker(ctx, (void *)receiver);
 225
 226                 snd_ctx->out_fds[i] = fds[1];
 227                 if (!thread_mode)
 228                         close(fds[0]);
 229         }
 230
 231         /* Now we have all the fds, fork the senders */
 232         for (i = 0; i < num_fds; i++) {
 233                 snd_ctx->ready_out = ready_out;
 234                 snd_ctx->wakefd = wakefd;
 235                 snd_ctx->num_fds = num_fds;
 236
 237                 pth[num_fds+i] = create_worker(snd_ctx, (void *)sender);
 238         }
 239
 240         /* Close the fds we have left */
 241         if (!thread_mode)
 242                 for (i = 0; i < num_fds; i++)
 243                         close(snd_ctx->out_fds[i]);
 244
 245         /* Return number of children to reap */
 246         return num_fds * 2;
 247 }
 248
 249 static const struct option options[] = {
 250         OPT_BOOLEAN('p', "pipe", &use_pipes,
 251                     "Use pipe() instead of socketpair()"),
 252         OPT_BOOLEAN('t', "thread", &thread_mode,
 253                     "Be multi thread instead of multi process"),
 254         OPT_UINTEGER('g', "group", &num_groups, "Specify number of groups"),
 255         OPT_UINTEGER('l', "nr_loops", &nr_loops, "Specify the number of loops to run (default: 100)"),
 256         OPT_END()
 257 };
 258
 259 static const char * const bench_sched_message_usage[] = {
 260         "perf bench sched messaging <options>",
 261         NULL
 262 };
 263
 264 int bench_sched_messaging(int argc, const char **argv)
 265 {
 266         unsigned int i, total_children;
 267         struct timeval start, stop, diff;
 268         unsigned int num_fds = 20;
 269         int readyfds[2], wakefds[2];
 270         char dummy;
 271         pthread_t *pth_tab;
 272
 273         argc = parse_options(argc, argv, options,
 274                              bench_sched_message_usage, 0);
 275
 276         pth_tab = malloc(num_fds * 2 * num_groups * sizeof(pthread_t));
 277         if (!pth_tab)
 278                 err(EXIT_FAILURE, "main:malloc()");
 279
 280         fdpair(readyfds);
 281         fdpair(wakefds);
 282
 283         total_children = 0;
 284         for (i = 0; i < num_groups; i++)
 285                 total_children += group(pth_tab+total_children, num_fds,
 286                                         readyfds[1], wakefds[0]);
 287
 288         /* Wait for everyone to be ready */
 289         for (i = 0; i < total_children; i++)
 290                 if (read(readyfds[0], &dummy, 1) != 1)
 291                         err(EXIT_FAILURE, "Reading for readyfds");
 292
 293         gettimeofday(&start, NULL);
 294
 295         /* Kick them off */
 296         if (write(wakefds[1], &dummy, 1) != 1)
 297                 err(EXIT_FAILURE, "Writing to start them");
 298
 299         /* Reap them all */
 300         for (i = 0; i < total_children; i++)
 301                 reap_worker(pth_tab[i]);
 302
 303         gettimeofday(&stop, NULL);
 304
 305         timersub(&stop, &start, &diff);
 306
 307         switch (bench_format) {
 308         case BENCH_FORMAT_DEFAULT:
 309                 printf("# %d sender and receiver %s per group\n",
 310                        num_fds, thread_mode ? "threads" : "processes");
 311                 printf("# %d groups == %d %s run\n\n",
 312                        num_groups, num_groups * 2 * num_fds,
 313                        thread_mode ? "threads" : "processes");
 314                 printf(" %14s: %lu.%03lu [sec]\n", "Total time",
 315                        diff.tv_sec,
 316                        (unsigned long) (diff.tv_usec / USEC_PER_MSEC));
 317                 break;
 318         case BENCH_FORMAT_SIMPLE:
 319                 printf("%lu.%03lu\n", diff.tv_sec,
 320                        (unsigned long) (diff.tv_usec / USEC_PER_MSEC));
 321                 break;
 322         default:
 323                 /* reaching here is something disaster */
 324                 fprintf(stderr, "Unknown format:%d\n", bench_format);
 325                 exit(1);
 326                 break;
 327         }
 328
 329         free(pth_tab);
 330
 331         return 0;
 332 }