nptl/sockperf.c

   1 #define _GNU_SOURCE
   2 #include <argp.h>
   3 #include <complex.h>
   4 #include <errno.h>
   5 #include <error.h>
   6 #include <fcntl.h>
   7 #include <gd.h>
   8 #include <inttypes.h>
   9 #include <pthread.h>
  10 #include <signal.h>
  11 #include <stdbool.h>
  12 #include <stddef.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <time.h>
  17 #include <unistd.h>
  18 #include <sys/param.h>
  19 #include <sys/poll.h>
  20 #include <sys/socket.h>
  21 #include <sys/un.h>
  22
  23
  24 #define size_x 320
  25 #define size_y 240
  26
  27
  28 #define PATH "/tmp/s.sockperf"
  29
  30
  31 struct thread_param
  32 {
  33   unsigned int from;
  34   unsigned int to;
  35   unsigned int nserv;
  36 };
  37
  38 struct coord
  39 {
  40   unsigned int x;
  41   unsigned int y;
  42   complex double z;
  43 };
  44
  45
  46 /* We use 64bit values for the times.  */
  47 typedef unsigned long long int hp_timing_t;
  48
  49
  50 static unsigned int nclients = 2;
  51 static unsigned int nservers = 2;
  52
  53 static bool timing;
  54 static int points;
  55
  56
  57 static complex double top_left = -0.7 + 0.2i;
  58 static complex double bottom_right = -0.5 - 0.0i;
  59
  60
  61 static int colors[256];
  62 static gdImagePtr image;
  63 static pthread_mutex_t image_lock;
  64
  65 static int sock;
  66
  67
  68 static void *
  69 client (void *arg)
  70 {
  71   struct thread_param *param = arg;
  72   unsigned int cnt;
  73   unsigned int nserv = param->nserv;
  74   struct pollfd servpoll[nserv];
  75   struct sockaddr_un servaddr;
  76   socklen_t servlen;
  77   struct coord c;
  78
  79   bool new_coord (void)
  80     {
  81       if (cnt >= param->to)
  82         return false;
  83
  84       unsigned int row = cnt / size_x;
  85       unsigned int col = cnt % size_x;
  86
  87       c.x = col;
  88       c.y = row;
  89       c.z = (top_left
  90              + ((col
  91                  * (creal (bottom_right) - creal (top_left))) / size_x)
  92              + (_Complex_I * (row * (cimag (bottom_right) - cimag (top_left)))
  93                 / size_y));
  94
  95       ++cnt;
  96
  97       return true;
  98     }
  99
 100
 101   for (cnt = 0; cnt < nserv; ++cnt)
 102     {
 103       servpoll[cnt].fd = socket (AF_UNIX, SOCK_STREAM, 0);
 104       if (servpoll[cnt].fd < 0)
 105         {
 106           puts ("cannot create socket in client");
 107           return NULL;
 108         }
 109
 110       memset (&servaddr, '\0', sizeof (servaddr));
 111       servaddr.sun_family = AF_UNIX;
 112       strncpy (servaddr.sun_path, PATH, sizeof (servaddr.sun_path));
 113       servlen = offsetof (struct sockaddr_un, sun_path) + strlen (PATH) + 1;
 114
 115
 116       int err;
 117       while (1)
 118         {
 119           err = TEMP_FAILURE_RETRY (connect (servpoll[cnt].fd, &servaddr,
 120                                              servlen));
 121           if (err != -1 || errno != ECONNREFUSED)
 122             break;
 123
 124           pthread_yield ();
 125         }
 126
 127       if (err == -1)
 128         {
 129           printf ("cannot connect: %m (%d)\n", errno);
 130           exit (1);
 131         }
 132
 133       servpoll[cnt].events = POLLOUT;
 134       servpoll[cnt].revents = 0;
 135     }
 136
 137   cnt = param->from;
 138
 139   new_coord ();
 140   bool z_valid = true;
 141
 142   while (1)
 143     {
 144       int i;
 145       int n = poll (servpoll, nserv, -1);
 146       if (n == -1)
 147         {
 148           puts ("poll returned error");
 149           break;
 150         }
 151
 152       bool cont = false;
 153       for (i = 0; i < nserv && n > 0; ++i)
 154         if (servpoll[i].revents != 0)
 155           {
 156             if (servpoll[i].revents == POLLIN)
 157               {
 158                 unsigned int vals[3];
 159                 if (TEMP_FAILURE_RETRY (read (servpoll[i].fd, &vals,
 160                                               sizeof (vals)))
 161                     != sizeof (vals))
 162                   {
 163                     puts ("read error in client");
 164                     return NULL;
 165                   }
 166
 167                 pthread_mutex_lock (&image_lock);
 168
 169                 gdImageSetPixel (image, vals[0], vals[1], vals[2]);
 170                 ++points;
 171
 172                 pthread_mutex_unlock (&image_lock);
 173
 174                 servpoll[i].events = POLLOUT;
 175               }
 176             else
 177               {
 178                 if (servpoll[i].revents != POLLOUT)
 179                   printf ("revents: %hd != POLLOUT ???\n",
 180                           servpoll[i].revents);
 181
 182                 if (z_valid)
 183                   {
 184                     if (TEMP_FAILURE_RETRY (write (servpoll[i].fd, &c,
 185                                                    sizeof (c))) != sizeof (c))
 186                       {
 187                         puts ("write error in client");
 188                         return NULL;
 189                       }
 190                     cont = true;
 191                     servpoll[i].events = POLLIN;
 192
 193                     z_valid = new_coord ();
 194                     if (! z_valid)
 195                       /* No more to do.  Clear the event fields.  */
 196                       for (i = 0; i < nserv; ++i)
 197                         if (servpoll[i].events == POLLOUT)
 198                           servpoll[i].events = servpoll[i].revents = 0;
 199                   }
 200                 else
 201                   servpoll[i].events = servpoll[i].revents = 0;
 202               }
 203
 204             --n;
 205           }
 206         else if (servpoll[i].events != 0)
 207           cont = true;
 208
 209       if (! cont && ! z_valid)
 210         break;
 211     }
 212
 213   c.x = 0xffffffff;
 214   c.y = 0xffffffff;
 215   for (cnt = 0; cnt < nserv; ++cnt)
 216     {
 217       TEMP_FAILURE_RETRY (write (servpoll[cnt].fd, &c, sizeof (c)));
 218       close (servpoll[cnt].fd);
 219     }
 220
 221   return NULL;
 222 }
 223
 224
 225 static void *
 226 server (void *arg)
 227 {
 228   struct sockaddr_un cliaddr;
 229   socklen_t clilen;
 230   int clisock = TEMP_FAILURE_RETRY (accept (sock, &cliaddr, &clilen));
 231
 232   if (clisock == -1)
 233     {
 234       puts ("accept failed");
 235       return NULL;
 236     }
 237
 238   while (1)
 239     {
 240       struct coord c;
 241
 242       if (TEMP_FAILURE_RETRY (read (clisock, &c, sizeof (c))) != sizeof (c))
 243         {
 244           printf ("server read failed: %m (%d)\n", errno);
 245           break;
 246         }
 247
 248       if (c.x == 0xffffffff && c.y == 0xffffffff)
 249         break;
 250
 251       unsigned int rnds = 0;
 252       complex double z = c.z;
 253       while (cabs (z) < 4.0)
 254         {
 255           z = z * z - 1;
 256           if (++rnds == 255)
 257             break;
 258         }
 259
 260       unsigned int vals[3] = { c.x, c.y, rnds };
 261       if (TEMP_FAILURE_RETRY (write (clisock, vals, sizeof (vals)))
 262           != sizeof (vals))
 263         {
 264           puts ("server write error");
 265           return NULL;
 266         }
 267     }
 268
 269   close (clisock);
 270
 271   return NULL;
 272 }
 273
 274
 275 static const char *outfilename = "test.png";
 276
 277
 278 static const struct argp_option options[] =
 279   {
 280     { "clients", 'c', "NUMBER", 0, "Number of client threads" },
 281     { "servers", 's', "NUMBER", 0, "Number of server threads per client" },
 282     { "timing", 'T', NULL, 0,
 283       "Measure time from startup to the last thread finishing" },
 284     { NULL, 0, NULL, 0, NULL }
 285   };
 286
 287 /* Prototype for option handler.  */
 288 static error_t parse_opt (int key, char *arg, struct argp_state *state);
 289
 290 /* Data structure to communicate with argp functions.  */
 291 static struct argp argp =
 292 {
 293   options, parse_opt
 294 };
 295
 296
 297 int
 298 main (int argc, char *argv[])
 299 {
 300   int cnt;
 301   FILE *outfile;
 302   struct sockaddr_un servaddr;
 303   socklen_t servlen;
 304   int remaining;
 305
 306   /* Parse and process arguments.  */
 307   argp_parse (&argp, argc, argv, 0, &remaining, NULL);
 308
 309
 310   pthread_t servth[nservers * nclients];
 311   pthread_t clntth[nclients];
 312   struct thread_param clntparam[nclients];
 313
 314
 315   image = gdImageCreate (size_x, size_y);
 316   if (image == NULL)
 317     {
 318       puts ("gdImageCreate failed");
 319       return 1;
 320     }
 321
 322   for (cnt = 0; cnt < 255; ++cnt)
 323     colors[cnt] = gdImageColorAllocate (image, 256 - cnt, 256 - cnt,
 324                                         256 - cnt);
 325   /* Black.  */
 326   colors[cnt] = gdImageColorAllocate (image, 0, 0, 0);
 327
 328
 329   sock = socket (AF_UNIX, SOCK_STREAM, 0);
 330   if (sock < 0)
 331     error (EXIT_FAILURE, errno, "cannot create socket");
 332
 333   memset (&servaddr, '\0', sizeof (servaddr));
 334   servaddr.sun_family = AF_UNIX;
 335   strncpy (servaddr.sun_path, PATH, sizeof (servaddr.sun_path));
 336   servlen = offsetof (struct sockaddr_un, sun_path) + strlen (PATH) + 1;
 337
 338   if (bind (sock, &servaddr, servlen) == -1)
 339     error (EXIT_FAILURE, errno, "bind failed");
 340
 341   listen (sock, SOMAXCONN);
 342
 343   pthread_mutex_init (&image_lock, NULL);
 344
 345
 346   struct sigaction sa;
 347   sa.sa_handler = SIG_IGN;
 348   sigemptyset (&sa.sa_mask);
 349   sa.sa_flags = 0;
 350
 351   clockid_t cl;
 352   struct timespec start_time;
 353   if (timing)
 354     {
 355       if (clock_getcpuclockid (0, &cl) != 0
 356           || clock_gettime (cl, &start_time) != 0)
 357         timing = false;
 358     }
 359
 360   /* Start the servers.  */
 361   for (cnt = 0; cnt < nservers * nclients; ++cnt)
 362     {
 363       if (pthread_create (&servth[cnt], NULL, server, NULL) != 0)
 364         {
 365           puts ("pthread_create for server failed");
 366           exit (1);
 367         }
 368     }
 369
 370   for (cnt = 0; cnt < nclients; ++cnt)
 371     {
 372       clntparam[cnt].from = cnt * (size_x * size_y) / nclients;
 373       clntparam[cnt].to = MIN ((cnt + 1) * (size_x * size_y) / nclients,
 374                                size_x * size_y);
 375       clntparam[cnt].nserv = nservers;
 376
 377       if (pthread_create (&clntth[cnt], NULL, client, &clntparam[cnt]) != 0)
 378         {
 379           puts ("pthread_create for client failed");
 380           exit (1);
 381         }
 382     }
 383
 384
 385   /* Wait for the clients.  */
 386   for (cnt = 0; cnt < nclients; ++cnt)
 387     if (pthread_join (clntth[cnt], NULL) != 0)
 388       {
 389         puts ("client pthread_join failed");
 390         exit (1);
 391       }
 392
 393   /* Wait for the servers.  */
 394   for (cnt = 0; cnt < nclients * nservers; ++cnt)
 395     if (pthread_join (servth[cnt], NULL) != 0)
 396       {
 397         puts ("server pthread_join failed");
 398         exit (1);
 399       }
 400
 401
 402   if (timing)
 403     {
 404       struct timespec end_time;
 405
 406       if (clock_gettime (cl, &end_time) == 0)
 407         {
 408           end_time.tv_sec -= start_time.tv_sec;
 409           end_time.tv_nsec -= start_time.tv_nsec;
 410           if (end_time.tv_nsec < 0)
 411             {
 412               end_time.tv_nsec += 1000000000;
 413               --end_time.tv_sec;
 414             }
 415
 416           printf ("\nRuntime: %lu.%09lu seconds\n%d points computed\n",
 417                   (unsigned long int) end_time.tv_sec,
 418                   (unsigned long int) end_time.tv_nsec,
 419                   points);
 420         }
 421     }
 422
 423
 424   outfile = fopen (outfilename, "w");
 425   if (outfile == NULL)
 426     error (EXIT_FAILURE, errno, "cannot open output file '%s'", outfilename);
 427
 428   gdImagePng (image, outfile);
 429
 430   fclose (outfile);
 431
 432   unlink (PATH);
 433
 434   return 0;
 435 }
 436
 437
 438 /* Handle program arguments.  */
 439 static error_t
 440 parse_opt (int key, char *arg, struct argp_state *state)
 441 {
 442   switch (key)
 443     {
 444     case 'c':
 445       nclients = strtoul (arg, NULL, 0);
 446       break;
 447
 448     case 's':
 449       nservers = strtoul (arg, NULL, 0);
 450       break;
 451
 452     case 'T':
 453       timing = true;
 454       break;
 455
 456     default:
 457       return ARGP_ERR_UNKNOWN;
 458     }
 459
 460   return 0;
 461 }
 462
 463
 464 static hp_timing_t
 465 get_clockfreq (void)
 466 {
 467   /* We read the information from the /proc filesystem.  It contains at
 468      least one line like
 469         cpu MHz         : 497.840237
 470      or also
 471         cpu MHz         : 497.841
 472      We search for this line and convert the number in an integer.  */
 473   static hp_timing_t result;
 474   int fd;
 475
 476   /* If this function was called before, we know the result.  */
 477   if (result != 0)
 478     return result;
 479
 480   fd = open ("/proc/cpuinfo", O_RDONLY);
 481   if (__glibc_likely (fd != -1))
 482     {
 483       /* XXX AFAIK the /proc filesystem can generate "files" only up
 484          to a size of 4096 bytes.  */
 485       char buf[4096];
 486       ssize_t n;
 487
 488       n = read (fd, buf, sizeof buf);
 489       if (__builtin_expect (n, 1) > 0)
 490         {
 491           char *mhz = memmem (buf, n, "cpu MHz", 7);
 492
 493           if (__glibc_likely (mhz != NULL))
 494             {
 495               char *endp = buf + n;
 496               int seen_decpoint = 0;
 497               int ndigits = 0;
 498
 499               /* Search for the beginning of the string.  */
 500               while (mhz < endp && (*mhz < '0' || *mhz > '9') && *mhz != '\n')
 501                 ++mhz;
 502
 503               while (mhz < endp && *mhz != '\n')
 504                 {
 505                   if (*mhz >= '0' && *mhz <= '9')
 506                     {
 507                       result *= 10;
 508                       result += *mhz - '0';
 509                       if (seen_decpoint)
 510                         ++ndigits;
 511                     }
 512                   else if (*mhz == '.')
 513                     seen_decpoint = 1;
 514
 515                   ++mhz;
 516                 }
 517
 518               /* Compensate for missing digits at the end.  */
 519               while (ndigits++ < 6)
 520                 result *= 10;
 521             }
 522         }
 523
 524       close (fd);
 525     }
 526
 527   return result;
 528 }
 529
 530
 531 int
 532 clock_getcpuclockid (pid_t pid, clockid_t *clock_id)
 533 {
 534   /* We don't allow any process ID but our own.  */
 535   if (pid != 0 && pid != getpid ())
 536     return EPERM;
 537
 538 #ifdef CLOCK_PROCESS_CPUTIME_ID
 539   /* Store the number.  */
 540   *clock_id = CLOCK_PROCESS_CPUTIME_ID;
 541
 542   return 0;
 543 #else
 544   /* We don't have a timer for that.  */
 545   return ENOENT;
 546 #endif
 547 }
 548
 549
 550 #define HP_TIMING_NOW(Var)      __asm__ __volatile__ ("rdtsc" : "=A" (Var))
 551
 552 /* Get current value of CLOCK and store it in TP.  */
 553 int
 554 clock_gettime (clockid_t clock_id, struct timespec *tp)
 555 {
 556   int retval = -1;
 557
 558   switch (clock_id)
 559     {
 560     case CLOCK_PROCESS_CPUTIME_ID:
 561       {
 562
 563         static hp_timing_t freq;
 564         hp_timing_t tsc;
 565
 566         /* Get the current counter.  */
 567         HP_TIMING_NOW (tsc);
 568
 569         if (freq == 0)
 570           {
 571             freq = get_clockfreq ();
 572             if (freq == 0)
 573               return EINVAL;
 574           }
 575
 576         /* Compute the seconds.  */
 577         tp->tv_sec = tsc / freq;
 578
 579         /* And the nanoseconds.  This computation should be stable until
 580            we get machines with about 16GHz frequency.  */
 581         tp->tv_nsec = ((tsc % freq) * UINT64_C (1000000000)) / freq;
 582
 583         retval = 0;
 584       }
 585     break;
 586
 587     default:
 588       errno = EINVAL;
 589       break;
 590     }
 591
 592   return retval;
 593 }