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 <poll.h>
  30 #include <limits.h>
  31 #include <err.h>
  32
  33 #define DATASIZE 100
  34
  35 static bool use_pipes = false;
  36 static unsigned int nr_loops = 100;
  37 static bool thread_mode = false;
  38 static unsigned int num_groups = 10;
  39
  40 struct sender_context {
  41         unsigned int num_fds;
  42         int ready_out;
  43         int wakefd;
  44         int out_fds[0];
  45 };
  46
  47 struct receiver_context {
  48         unsigned int num_packets;
  49         int in_fds[2];
  50         int ready_out;
  51         int wakefd;
  52 };
  53
  54 static void fdpair(int fds[2])
  55 {
  56         if (use_pipes) {
  57                 if (pipe(fds) == 0)
  58                         return;
  59         } else {
  60                 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0)
  61                         return;
  62         }
  63
  64         err(EXIT_FAILURE, use_pipes ? "pipe()" : "socketpair()");
  65 }
  66
  67 /* Block until we're ready to go */
  68 static void ready(int ready_out, int wakefd)
  69 {
  70         char dummy;
  71         struct pollfd pollfd = { .fd = wakefd, .events = POLLIN };
  72
  73         /* Tell them we're ready. */
  74         if (write(ready_out, &dummy, 1) != 1)
  75                 err(EXIT_FAILURE, "CLIENT: ready write");
  76
  77         /* Wait for "GO" signal */
  78         if (poll(&pollfd, 1, -1) != 1)
  79                 err(EXIT_FAILURE, "poll");
  80 }
  81
  82 /* Sender sprays nr_loops messages down each file descriptor */
  83 static void *sender(struct sender_context *ctx)
  84 {
  85         char data[DATASIZE];
  86         unsigned int i, j;
  87
  88         ready(ctx->ready_out, ctx->wakefd);
  89
  90         /* Now pump to every receiver. */
  91         for (i = 0; i < nr_loops; i++) {
  92                 for (j = 0; j < ctx->num_fds; j++) {
  93                         int ret, done = 0;
  94
  95 again:
  96                         ret = write(ctx->out_fds[j], data + done,
  97                                     sizeof(data)-done);
  98                         if (ret < 0)
  99                                 err(EXIT_FAILURE, "SENDER: write");
 100                         done += ret;
 101                         if (done < DATASIZE)
 102                                 goto again;
 103                 }
 104         }
 105
 106         return NULL;
 107 }
 108
 109
 110 /* One receiver per fd */
 111 static void *receiver(struct receiver_context* ctx)
 112 {
 113         unsigned int i;
 114
 115         if (!thread_mode)
 116                 close(ctx->in_fds[1]);
 117
 118         /* Wait for start... */
 119         ready(ctx->ready_out, ctx->wakefd);
 120
 121         /* Receive them all */
 122         for (i = 0; i < ctx->num_packets; i++) {
 123                 char data[DATASIZE];
 124                 int ret, done = 0;
 125
 126 again:
 127                 ret = read(ctx->in_fds[0], data + done, DATASIZE - done);
 128                 if (ret < 0)
 129                         err(EXIT_FAILURE, "SERVER: read");
 130                 done += ret;
 131                 if (done < DATASIZE)
 132                         goto again;
 133         }
 134
 135         return NULL;
 136 }
 137
 138 static pthread_t create_worker(void *ctx, void *(*func)(void *))
 139 {
 140         pthread_attr_t attr;
 141         pthread_t childid;
 142         int ret;
 143
 144         if (!thread_mode) {
 145                 /* process mode */
 146                 /* Fork the receiver. */
 147                 switch (fork()) {
 148                 case -1:
 149                         err(EXIT_FAILURE, "fork()");
 150                         break;
 151                 case 0:
 152                         (*func) (ctx);
 153                         exit(0);
 154                         break;
 155                 default:
 156                         break;
 157                 }
 158
 159                 return (pthread_t)0;
 160         }
 161
 162         if (pthread_attr_init(&attr) != 0)
 163                 err(EXIT_FAILURE, "pthread_attr_init:");
 164
 165 #ifndef __ia64__
 166         if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0)
 167                 err(EXIT_FAILURE, "pthread_attr_setstacksize");
 168 #endif
 169
 170         ret = pthread_create(&childid, &attr, func, ctx);
 171         if (ret != 0)
 172                 err(EXIT_FAILURE, "pthread_create failed");
 173
 174         return childid;
 175 }
 176
 177 static void reap_worker(pthread_t id)
 178 {
 179         int proc_status;
 180         void *thread_status;
 181
 182         if (!thread_mode) {
 183                 /* process mode */
 184                 wait(&proc_status);
 185                 if (!WIFEXITED(proc_status))
 186                         exit(1);
 187         } else {
 188                 pthread_join(id, &thread_status);
 189         }
 190 }
 191
 192 /* One group of senders and receivers */
 193 static unsigned int group(pthread_t *pth,
 194                 unsigned int num_fds,
 195                 int ready_out,
 196                 int wakefd)
 197 {
 198         unsigned int i;
 199         struct sender_context *snd_ctx = malloc(sizeof(struct sender_context)
 200                         + num_fds * sizeof(int));
 201
 202         if (!snd_ctx)
 203                 err(EXIT_FAILURE, "malloc()");
 204
 205         for (i = 0; i < num_fds; i++) {
 206                 int fds[2];
 207                 struct receiver_context *ctx = malloc(sizeof(*ctx));
 208
 209                 if (!ctx)
 210                         err(EXIT_FAILURE, "malloc()");
 211
 212
 213                 /* Create the pipe between client and server */
 214                 fdpair(fds);
 215
 216                 ctx->num_packets = num_fds * nr_loops;
 217                 ctx->in_fds[0] = fds[0];
 218                 ctx->in_fds[1] = fds[1];
 219                 ctx->ready_out = ready_out;
 220                 ctx->wakefd = wakefd;
 221
 222                 pth[i] = create_worker(ctx, (void *)receiver);
 223
 224                 snd_ctx->out_fds[i] = fds[1];
 225                 if (!thread_mode)
 226                         close(fds[0]);
 227         }
 228
 229         /* Now we have all the fds, fork the senders */
 230         for (i = 0; i < num_fds; i++) {
 231                 snd_ctx->ready_out = ready_out;
 232                 snd_ctx->wakefd = wakefd;
 233                 snd_ctx->num_fds = num_fds;
 234
 235                 pth[num_fds+i] = create_worker(snd_ctx, (void *)sender);
 236         }
 237
 238         /* Close the fds we have left */
 239         if (!thread_mode)
 240                 for (i = 0; i < num_fds; i++)
 241                         close(snd_ctx->out_fds[i]);
 242
 243         /* Return number of children to reap */
 244         return num_fds * 2;
 245 }
 246
 247 static const struct option options[] = {
 248         OPT_BOOLEAN('p', "pipe", &use_pipes,
 249                     "Use pipe() instead of socketpair()"),
 250         OPT_BOOLEAN('t', "thread", &thread_mode,
 251                     "Be multi thread instead of multi process"),
 252         OPT_UINTEGER('g', "group", &num_groups, "Specify number of groups"),
 253         OPT_UINTEGER('l', "nr_loops", &nr_loops, "Specify the number of loops to run (default: 100)"),
 254         OPT_END()
 255 };
 256
 257 static const char * const bench_sched_message_usage[] = {
 258         "perf bench sched messaging <options>",
 259         NULL
 260 };
 261
 262 int bench_sched_messaging(int argc, const char **argv,
 263                     const char *prefix __maybe_unused)
 264 {
 265         unsigned int i, total_children;
 266         struct timeval start, stop, diff;
 267         unsigned int num_fds = 20;
 268         int readyfds[2], wakefds[2];
 269         char dummy;
 270         pthread_t *pth_tab;
 271
 272         argc = parse_options(argc, argv, options,
 273                              bench_sched_message_usage, 0);
 274
 275         pth_tab = malloc(num_fds * 2 * num_groups * sizeof(pthread_t));
 276         if (!pth_tab)
 277                 err(EXIT_FAILURE, "main:malloc()");
 278
 279         fdpair(readyfds);
 280         fdpair(wakefds);
 281
 282         total_children = 0;
 283         for (i = 0; i < num_groups; i++)
 284                 total_children += group(pth_tab+total_children, num_fds,
 285                                         readyfds[1], wakefds[0]);
 286
 287         /* Wait for everyone to be ready */
 288         for (i = 0; i < total_children; i++)
 289                 if (read(readyfds[0], &dummy, 1) != 1)
 290                         err(EXIT_FAILURE, "Reading for readyfds");
 291
 292         gettimeofday(&start, NULL);
 293
 294         /* Kick them off */
 295         if (write(wakefds[1], &dummy, 1) != 1)
 296                 err(EXIT_FAILURE, "Writing to start them");
 297
 298         /* Reap them all */
 299         for (i = 0; i < total_children; i++)
 300                 reap_worker(pth_tab[i]);
 301
 302         gettimeofday(&stop, NULL);
 303
 304         timersub(&stop, &start, &diff);
 305
 306         switch (bench_format) {
 307         case BENCH_FORMAT_DEFAULT:
 308                 printf("# %d sender and receiver %s per group\n",
 309                        num_fds, thread_mode ? "threads" : "processes");
 310                 printf("# %d groups == %d %s run\n\n",
 311                        num_groups, num_groups * 2 * num_fds,
 312                        thread_mode ? "threads" : "processes");
 313                 printf(" %14s: %lu.%03lu [sec]\n", "Total time",
 314                        diff.tv_sec,
 315                        (unsigned long) (diff.tv_usec/1000));
 316                 break;
 317         case BENCH_FORMAT_SIMPLE:
 318                 printf("%lu.%03lu\n", diff.tv_sec,
 319                        (unsigned long) (diff.tv_usec/1000));
 320                 break;
 321         default:
 322                 /* reaching here is something disaster */
 323                 fprintf(stderr, "Unknown format:%d\n", bench_format);
 324                 exit(1);
 325                 break;
 326         }
 327
 328         free(pth_tab);
 329
 330         return 0;
 331 }