release/src-rt-6.x.4708/linux/linux-2.6.36/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
  34 static bool use_pipes = false;
  35 static unsigned int loops = 100;
  36 static bool thread_mode = false;
  37 static unsigned int num_groups = 10;
  38
  39 struct sender_context {
  40         unsigned int num_fds;
  41         int ready_out;
  42         int wakefd;
  43         int out_fds[0];
  44 };
  45
  46 struct receiver_context {
  47         unsigned int num_packets;
  48         int in_fds[2];
  49         int ready_out;
  50         int wakefd;
  51 };
  52
  53 static void barf(const char *msg)
  54 {
  55         fprintf(stderr, "%s (error: %s)\n", msg, strerror(errno));
  56         exit(1);
  57 }
  58
  59 static 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 */
  73 static 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 */
  88 static 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
 100 again:
 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 */
 116 static 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
 131 again:
 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
 143 static 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
 184 static 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 */
 200 static 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
 254 static 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
 264 static const char * const bench_sched_message_usage[] = {
 265         "perf bench sched messaging <options>",
 266         NULL
 267 };
 268
 269 int 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 }