Pileus Git - ~andy/linux/blob - tools/perf/bench/sched-messaging.c

   1 /*
   2  *
   3  * builtin-bench-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 int use_pipes = 0;
  35 static unsigned int loops = 100;
  36 static unsigned int thread_mode = 0;
  37 static unsigned int num_groups = 10;
  38 static int simple = 0;
  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 barf(const char *msg)
  55 {
  56         fprintf(stderr, "%s (error: %s)\n", msg, strerror(errno));
  57         exit(1);
  58 }
  59
  60 static void fdpair(int fds[2])
  61 {
  62         if (use_pipes) {
  63                 if (pipe(fds) == 0)
  64                         return;
  65         } else {
  66                 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0)
  67                         return;
  68         }
  69
  70         barf(use_pipes ? "pipe()" : "socketpair()");
  71 }
  72
  73 /* Block until we're ready to go */
  74 static void ready(int ready_out, int wakefd)
  75 {
  76         char dummy;
  77         struct pollfd pollfd = { .fd = wakefd, .events = POLLIN };
  78
  79         /* Tell them we're ready. */
  80         if (write(ready_out, &dummy, 1) != 1)
  81                 barf("CLIENT: ready write");
  82
  83         /* Wait for "GO" signal */
  84         if (poll(&pollfd, 1, -1) != 1)
  85                 barf("poll");
  86 }
  87
  88 /* Sender sprays loops messages down each file descriptor */
  89 static void *sender(struct sender_context *ctx)
  90 {
  91         char data[DATASIZE];
  92         unsigned int i, j;
  93
  94         ready(ctx->ready_out, ctx->wakefd);
  95
  96         /* Now pump to every receiver. */
  97         for (i = 0; i < loops; i++) {
  98                 for (j = 0; j < ctx->num_fds; j++) {
  99                         int ret, done = 0;
 100
 101 again:
 102                         ret = write(ctx->out_fds[j], data + done,
 103                                     sizeof(data)-done);
 104                         if (ret < 0)
 105                                 barf("SENDER: write");
 106                         done += ret;
 107                         if (done < DATASIZE)
 108                                 goto again;
 109                 }
 110         }
 111
 112         return NULL;
 113 }
 114
 115
 116 /* One receiver per fd */
 117 static void *receiver(struct receiver_context* ctx)
 118 {
 119         unsigned int i;
 120
 121         if (!thread_mode)
 122                 close(ctx->in_fds[1]);
 123
 124         /* Wait for start... */
 125         ready(ctx->ready_out, ctx->wakefd);
 126
 127         /* Receive them all */
 128         for (i = 0; i < ctx->num_packets; i++) {
 129                 char data[DATASIZE];
 130                 int ret, done = 0;
 131
 132 again:
 133                 ret = read(ctx->in_fds[0], data + done, DATASIZE - done);
 134                 if (ret < 0)
 135                         barf("SERVER: read");
 136                 done += ret;
 137                 if (done < DATASIZE)
 138                         goto again;
 139         }
 140
 141         return NULL;
 142 }
 143
 144 static pthread_t create_worker(void *ctx, void *(*func)(void *))
 145 {
 146         pthread_attr_t attr;
 147         pthread_t childid;
 148         int err;
 149
 150         if (!thread_mode) {
 151                 /* process mode */
 152                 /* Fork the receiver. */
 153                 switch (fork()) {
 154                 case -1:
 155                         barf("fork()");
 156                         break;
 157                 case 0:
 158                         (*func) (ctx);
 159                         exit(0);
 160                         break;
 161                 default:
 162                         break;
 163                 }
 164
 165                 return (pthread_t)0;
 166         }
 167
 168         if (pthread_attr_init(&attr) != 0)
 169                 barf("pthread_attr_init:");
 170
 171 #ifndef __ia64__
 172         if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0)
 173                 barf("pthread_attr_setstacksize");
 174 #endif
 175
 176         err = pthread_create(&childid, &attr, func, ctx);
 177         if (err != 0) {
 178                 fprintf(stderr, "pthread_create failed: %s (%d)\n",
 179                         strerror(err), err);
 180                 exit(-1);
 181         }
 182         return childid;
 183 }
 184
 185 static void reap_worker(pthread_t id)
 186 {
 187         int proc_status;
 188         void *thread_status;
 189
 190         if (!thread_mode) {
 191                 /* process mode */
 192                 wait(&proc_status);
 193                 if (!WIFEXITED(proc_status))
 194                         exit(1);
 195         } else {
 196                 pthread_join(id, &thread_status);
 197         }
 198 }
 199
 200 /* One group of senders and receivers */
 201 static unsigned int group(pthread_t *pth,
 202                 unsigned int num_fds,
 203                 int ready_out,
 204                 int wakefd)
 205 {
 206         unsigned int i;
 207         struct sender_context *snd_ctx = malloc(sizeof(struct sender_context)
 208                         + num_fds * sizeof(int));
 209
 210         if (!snd_ctx)
 211                 barf("malloc()");
 212
 213         for (i = 0; i < num_fds; i++) {
 214                 int fds[2];
 215                 struct receiver_context *ctx = malloc(sizeof(*ctx));
 216
 217                 if (!ctx)
 218                         barf("malloc()");
 219
 220
 221                 /* Create the pipe between client and server */
 222                 fdpair(fds);
 223
 224                 ctx->num_packets = num_fds * loops;
 225                 ctx->in_fds[0] = fds[0];
 226                 ctx->in_fds[1] = fds[1];
 227                 ctx->ready_out = ready_out;
 228                 ctx->wakefd = wakefd;
 229
 230                 pth[i] = create_worker(ctx, (void *)receiver);
 231
 232                 snd_ctx->out_fds[i] = fds[1];
 233                 if (!thread_mode)
 234                         close(fds[0]);
 235         }
 236
 237         /* Now we have all the fds, fork the senders */
 238         for (i = 0; i < num_fds; i++) {
 239                 snd_ctx->ready_out = ready_out;
 240                 snd_ctx->wakefd = wakefd;
 241                 snd_ctx->num_fds = num_fds;
 242
 243                 pth[num_fds+i] = create_worker(snd_ctx, (void *)sender);
 244         }
 245
 246         /* Close the fds we have left */
 247         if (!thread_mode)
 248                 for (i = 0; i < num_fds; i++)
 249                         close(snd_ctx->out_fds[i]);
 250
 251         /* Return number of children to reap */
 252         return num_fds * 2;
 253 }
 254
 255 static const struct option options[] = {
 256         OPT_BOOLEAN('p', "pipe", &use_pipes,
 257                     "Use pipe() instead of socketpair()"),
 258         OPT_BOOLEAN('t', "thread", &thread_mode,
 259                     "Be multi thread instead of multi process"),
 260         OPT_INTEGER('g', "group", &num_groups,
 261                     "Specify number of groups"),
 262         OPT_INTEGER('l', "loop", &loops,
 263                     "Specify number of loops"),
 264         OPT_BOOLEAN('s', "simple-output", &simple,
 265                     "Do simple output (this maybe useful for"
 266                     "processing by scripts or graph tools like gnuplot)"),
 267         OPT_END()
 268 };
 269
 270 static const char * const bench_sched_message_usage[] = {
 271         "perf bench sched messaging <options>",
 272         NULL
 273 };
 274
 275 int bench_sched_messaging(int argc, const char **argv,
 276                     const char *prefix __used)
 277 {
 278         unsigned int i, total_children;
 279         struct timeval start, stop, diff;
 280         unsigned int num_fds = 20;
 281         int readyfds[2], wakefds[2];
 282         char dummy;
 283         pthread_t *pth_tab;
 284
 285         argc = parse_options(argc, argv, options,
 286                              bench_sched_message_usage, 0);
 287
 288         pth_tab = malloc(num_fds * 2 * num_groups * sizeof(pthread_t));
 289         if (!pth_tab)
 290                 barf("main:malloc()");
 291
 292         fdpair(readyfds);
 293         fdpair(wakefds);
 294
 295         total_children = 0;
 296         for (i = 0; i < num_groups; i++)
 297                 total_children += group(pth_tab+total_children, num_fds,
 298                                         readyfds[1], wakefds[0]);
 299
 300         /* Wait for everyone to be ready */
 301         for (i = 0; i < total_children; i++)
 302                 if (read(readyfds[0], &dummy, 1) != 1)
 303                         barf("Reading for readyfds");
 304
 305         gettimeofday(&start, NULL);
 306
 307         /* Kick them off */
 308         if (write(wakefds[1], &dummy, 1) != 1)
 309                 barf("Writing to start them");
 310
 311         /* Reap them all */
 312         for (i = 0; i < total_children; i++)
 313                 reap_worker(pth_tab[i]);
 314
 315         gettimeofday(&stop, NULL);
 316
 317         timersub(&stop, &start, &diff);
 318
 319         if (simple)
 320                 printf("%lu.%03lu\n", diff.tv_sec, diff.tv_usec/1000);
 321         else {
 322                 printf("(%d sender and receiver %s per group)\n",
 323                        num_fds, thread_mode ? "threads" : "processes");
 324                 printf("(%d groups == %d %s run)\n\n",
 325                        num_groups, num_groups * 2 * num_fds,
 326                        thread_mode ? "threads" : "processes");
 327                 printf("\tTotal time:%lu.%03lu sec\n",
 328                        diff.tv_sec, diff.tv_usec/1000);
 329         }
 330
 331         return 0;
 332 }