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 <subcmd/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 <poll.h>
  30 #include <limits.h>
  31 #include <err.h>
  32 #include <linux/time64.h>
  33
  34 #define DATASIZE 100
  35
  36 static bool use_pipes = false;
  37 static unsigned int nr_loops = 100;
  38 static bool thread_mode = false;
  39 static unsigned int num_groups = 10;
  40
  41 struct sender_context {
  42         unsigned int num_fds;
  43         int ready_out;
  44         int wakefd;
  45         int out_fds[0];
  46 };
  47
  48 struct receiver_context {
  49         unsigned int num_packets;
  50         int in_fds[2];
  51         int ready_out;
  52         int wakefd;
  53 };
  54
  55 static void fdpair(int fds[2])
  56 {
  57         if (use_pipes) {
  58                 if (pipe(fds) == 0)
  59                         return;
  60         } else {
  61                 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0)
  62                         return;
  63         }
  64
  65         err(EXIT_FAILURE, use_pipes ? "pipe()" : "socketpair()");
  66 }
  67
  68 /* Block until we're ready to go */
  69 static void ready(int ready_out, int wakefd)
  70 {
  71         char dummy;
  72         struct pollfd pollfd = { .fd = wakefd, .events = POLLIN };
  73
  74         /* Tell them we're ready. */
  75         if (write(ready_out, &dummy, 1) != 1)
  76                 err(EXIT_FAILURE, "CLIENT: ready write");
  77
  78         /* Wait for "GO" signal */
  79         if (poll(&pollfd, 1, -1) != 1)
  80                 err(EXIT_FAILURE, "poll");
  81 }
  82
  83 /* Sender sprays nr_loops messages down each file descriptor */
  84 static void *sender(struct sender_context *ctx)
  85 {
  86         char data[DATASIZE];
  87         unsigned int i, j;
  88
  89         ready(ctx->ready_out, ctx->wakefd);
  90
  91         /* Now pump to every receiver. */
  92         for (i = 0; i < nr_loops; i++) {
  93                 for (j = 0; j < ctx->num_fds; j++) {
  94                         int ret, done = 0;
  95
  96 again:
  97                         ret = write(ctx->out_fds[j], data + done,
  98                                     sizeof(data)-done);
  99                         if (ret < 0)
 100                                 err(EXIT_FAILURE, "SENDER: write");
 101                         done += ret;
 102                         if (done < DATASIZE)
 103                                 goto again;
 104                 }
 105         }
 106
 107         return NULL;
 108 }
 109
 110
 111 /* One receiver per fd */
 112 static void *receiver(struct receiver_context* ctx)
 113 {
 114         unsigned int i;
 115
 116         if (!thread_mode)
 117                 close(ctx->in_fds[1]);
 118
 119         /* Wait for start... */
 120         ready(ctx->ready_out, ctx->wakefd);
 121
 122         /* Receive them all */
 123         for (i = 0; i < ctx->num_packets; i++) {
 124                 char data[DATASIZE];
 125                 int ret, done = 0;
 126
 127 again:
 128                 ret = read(ctx->in_fds[0], data + done, DATASIZE - done);
 129                 if (ret < 0)
 130                         err(EXIT_FAILURE, "SERVER: read");
 131                 done += ret;
 132                 if (done < DATASIZE)
 133                         goto again;
 134         }
 135
 136         return NULL;
 137 }
 138
 139 static pthread_t create_worker(void *ctx, void *(*func)(void *))
 140 {
 141         pthread_attr_t attr;
 142         pthread_t childid;
 143         int ret;
 144
 145         if (!thread_mode) {
 146                 /* process mode */
 147                 /* Fork the receiver. */
 148                 switch (fork()) {
 149                 case -1:
 150                         err(EXIT_FAILURE, "fork()");
 151                         break;
 152                 case 0:
 153                         (*func) (ctx);
 154                         exit(0);
 155                         break;
 156                 default:
 157                         break;
 158                 }
 159
 160                 return (pthread_t)0;
 161         }
 162
 163         if (pthread_attr_init(&attr) != 0)
 164                 err(EXIT_FAILURE, "pthread_attr_init:");
 165
 166 #ifndef __ia64__
 167         if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0)
 168                 err(EXIT_FAILURE, "pthread_attr_setstacksize");
 169 #endif
 170
 171         ret = pthread_create(&childid, &attr, func, ctx);
 172         if (ret != 0)
 173                 err(EXIT_FAILURE, "pthread_create failed");
 174
 175         return childid;
 176 }
 177
 178 static void reap_worker(pthread_t id)
 179 {
 180         int proc_status;
 181         void *thread_status;
 182
 183         if (!thread_mode) {
 184                 /* process mode */
 185                 wait(&proc_status);
 186                 if (!WIFEXITED(proc_status))
 187                         exit(1);
 188         } else {
 189                 pthread_join(id, &thread_status);
 190         }
 191 }
 192
 193 /* One group of senders and receivers */
 194 static unsigned int group(pthread_t *pth,
 195                 unsigned int num_fds,
 196                 int ready_out,
 197                 int wakefd)
 198 {
 199         unsigned int i;
 200         struct sender_context *snd_ctx = malloc(sizeof(struct sender_context)
 201                         + num_fds * sizeof(int));
 202
 203         if (!snd_ctx)
 204                 err(EXIT_FAILURE, "malloc()");
 205
 206         for (i = 0; i < num_fds; i++) {
 207                 int fds[2];
 208                 struct receiver_context *ctx = malloc(sizeof(*ctx));
 209
 210                 if (!ctx)
 211                         err(EXIT_FAILURE, "malloc()");
 212
 213
 214                 /* Create the pipe between client and server */
 215                 fdpair(fds);
 216
 217                 ctx->num_packets = num_fds * nr_loops;
 218                 ctx->in_fds[0] = fds[0];
 219                 ctx->in_fds[1] = fds[1];
 220                 ctx->ready_out = ready_out;
 221                 ctx->wakefd = wakefd;
 222
 223                 pth[i] = create_worker(ctx, (void *)receiver);
 224
 225                 snd_ctx->out_fds[i] = fds[1];
 226                 if (!thread_mode)
 227                         close(fds[0]);
 228         }
 229
 230         /* Now we have all the fds, fork the senders */
 231         for (i = 0; i < num_fds; i++) {
 232                 snd_ctx->ready_out = ready_out;
 233                 snd_ctx->wakefd = wakefd;
 234                 snd_ctx->num_fds = num_fds;
 235
 236                 pth[num_fds+i] = create_worker(snd_ctx, (void *)sender);
 237         }
 238
 239         /* Close the fds we have left */
 240         if (!thread_mode)
 241                 for (i = 0; i < num_fds; i++)
 242                         close(snd_ctx->out_fds[i]);
 243
 244         /* Return number of children to reap */
 245         return num_fds * 2;
 246 }
 247
 248 static const struct option options[] = {
 249         OPT_BOOLEAN('p', "pipe", &use_pipes,
 250                     "Use pipe() instead of socketpair()"),
 251         OPT_BOOLEAN('t', "thread", &thread_mode,
 252                     "Be multi thread instead of multi process"),
 253         OPT_UINTEGER('g', "group", &num_groups, "Specify number of groups"),
 254         OPT_UINTEGER('l', "nr_loops", &nr_loops, "Specify the number of loops to run (default: 100)"),
 255         OPT_END()
 256 };
 257
 258 static const char * const bench_sched_message_usage[] = {
 259         "perf bench sched messaging <options>",
 260         NULL
 261 };
 262
 263 int bench_sched_messaging(int argc, const char **argv,
 264                     const char *prefix __maybe_unused)
 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 }