git.sesse.net Git - jam/blob - jam.c

   1 #include <stdio.h>
   2 #include <math.h>
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include <getopt.h>
   6 #include <netdb.h>
   7 #include <unistd.h>
   8 #include <pthread.h>
   9 #include <sys/socket.h>
  10 #include <netinet/in.h>
  11 #include <sys/epoll.h>
  12 #include <sys/ioctl.h>
  13 #include <errno.h>
  14
  15 unsigned short port = 2007;
  16
  17 struct in_addr *destinations = NULL;
  18 unsigned num_destinations = 0;
  19 unsigned room_destinations = 0;
  20
  21 struct in_addr *sources = NULL;
  22 unsigned num_sources = 0;
  23 unsigned room_sources = 0;
  24
  25 unsigned num_senders = 128;
  26 unsigned num_sockets_per_sender = 16;
  27 unsigned do_listen = 1;
  28
  29 unsigned long long total_bytes_received = 0;
  30 pthread_mutex_t receive_mutex = PTHREAD_MUTEX_INITIALIZER;
  31
  32 unsigned long long total_bytes_sent = 0;
  33 pthread_mutex_t send_mutex = PTHREAD_MUTEX_INITIALIZER;
  34
  35 const static struct option longopts[] = {
  36         { "source-list", required_argument, NULL, 's' },
  37         { "destination-list", required_argument, NULL, 'd' },
  38         { "num-senders", required_argument, NULL, 'n' },
  39         { "num-sockets-per-sender", required_argument, NULL, 'N' },
  40         { "port", required_argument, NULL, 'p' },
  41         { "sender-only", no_argument, NULL, 'o' },
  42         { NULL, 0, NULL, 0 }
  43 };
  44
  45 // generates from [0,1>
  46 double gen_uniform_random()
  47 {
  48         return rand() / (RAND_MAX+1.0);
  49 }
  50
  51 double gen_pareto_random(double min, double k)
  52 {
  53         double u = gen_uniform_random();
  54         return min * pow(u, -1.0 / k);
  55 }
  56
  57 void read_ip_list(char *filename, struct in_addr **addr_list, unsigned *num, unsigned *room)
  58 {
  59         char buf[256];
  60         FILE *in = fopen(filename, "r");
  61         if (in == NULL) {
  62                 perror(filename);
  63                 exit(1);
  64         }
  65
  66         for ( ;; ) {
  67                 char *ptr;
  68                 struct in_addr addr;
  69                 struct hostent *he;
  70
  71                 if (fgets(buf, 256, in) == NULL)
  72                         break;
  73
  74                 ptr = strchr(buf, '\n');
  75                 if (ptr != NULL)
  76                         *ptr = 0;
  77
  78                 ptr = strchr(buf, '\r');
  79                 if (ptr != NULL)
  80                         *ptr = 0;
  81
  82                 ptr = buf + strspn(buf, " \t");
  83
  84                 if (ptr[0] == '#' || ptr[0] == 0)
  85                         continue;
  86
  87                 he = gethostbyname(ptr);
  88                 if (he == NULL) {
  89                         perror(ptr);
  90                         exit(1);
  91                 }
  92
  93                 // just pick the first for now
  94                 memcpy(&addr.s_addr, he->h_addr_list[0], sizeof(addr.s_addr));
  95
  96                 if (*num >= *room) {
  97                         if (*room == 0) {
  98                                 *room = 16;
  99                         } else {
 100                                 *room <<= 1;
 101                         }
 102                         *addr_list = (struct in_addr *)realloc(*addr_list, *room * sizeof(struct in_addr));
 103                 }
 104
 105                 (*addr_list)[*num] = addr;
 106                 ++*num;
 107         }
 108
 109         fclose(in);
 110 }
 111
 112 void parse_options(int argc, char **argv)
 113 {
 114         int option_index = 0;
 115
 116         for ( ;; ) {
 117                 int c = getopt_long(argc, argv, "s:d:n:N:p:o", longopts, &option_index);
 118                 switch (c) {
 119                 case 's':
 120                         read_ip_list(optarg, &sources, &num_sources, &room_sources);
 121                         break;
 122                 case 'd':
 123                         read_ip_list(optarg, &destinations, &num_destinations, &room_destinations);
 124                         break;
 125                 case 'n':
 126                         num_senders = atoi(optarg);
 127                         break;
 128                 case 'N':
 129                         num_sockets_per_sender = atoi(optarg);
 130                         break;
 131                 case 'p':
 132                         port = atoi(optarg);
 133                         break;
 134                 case 'o':
 135                         do_listen = 0;
 136                         break;
 137                 case -1:
 138                         return;       // end of argument list
 139                 default:
 140                         fprintf(stderr, "Invalid option\n");
 141                         exit(1);
 142                 }
 143         }
 144 }
 145
 146 struct sender {
 147         int fd;
 148         unsigned long long bytes_left;
 149 };
 150
 151 void generate_new_sender(int ep_fd)
 152 {
 153         int sock, one = 1;
 154         unsigned src_num, dst_num;
 155         unsigned long long num_bytes;
 156         struct sockaddr_in sin;
 157         struct epoll_event ev;
 158         struct sender *s;
 159
 160         s = (struct sender *)malloc(sizeof(struct sender));
 161         if (s == NULL) {
 162                 perror("malloc()");
 163                 exit(1);
 164         }
 165
 166         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 167         if (sock == -1) {
 168                 perror("socket()");
 169                 exit(1);
 170         }
 171
 172         // find the right parameters
 173         src_num = (unsigned)(num_sources * gen_uniform_random());
 174         dst_num = (unsigned)(num_destinations * gen_uniform_random());
 175         num_bytes = (unsigned)gen_pareto_random(1048576.0, 1.0);
 176
 177         // FIXME: bind to the right source
 178
 179         if (ioctl(sock, FIONBIO, &one) == -1) {
 180                 perror("FIONBIO");
 181                 exit(1);
 182         }
 183
 184         sin.sin_family = AF_INET;
 185         sin.sin_port = htons(port);
 186         sin.sin_addr = destinations[dst_num];
 187
 188         // non-blocking connect (will be detected by epoll later)
 189         if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) == -1 && errno != EINPROGRESS) {
 190                 perror("connect()");
 191                 exit(1);
 192         }
 193
 194         // stick it in the epoll set (FIXME: make edge-triggered?)
 195         ev.events = EPOLLOUT | EPOLLHUP | EPOLLERR;
 196         ev.data.ptr = s;
 197
 198         s->fd = sock;
 199         s->bytes_left = num_bytes;
 200
 201         if (epoll_ctl(ep_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
 202                 perror("EPOLL_CTL_ADD");
 203                 exit(1);
 204         }
 205 }
 206
 207 void *sender_worker(void *arg)
 208 {
 209         unsigned i;
 210         char buf[65536];
 211         unsigned long long bytes_sent = 0;
 212         int ep_fd;
 213         struct epoll_event *events;
 214
 215         ep_fd = epoll_create(num_sockets_per_sender);
 216         if (ep_fd == -1) {
 217                 perror("epoll_create");
 218                 exit(1);
 219         }
 220
 221         // malloc, since there might not be enough room on the stack
 222         events = (struct epoll_event *)malloc(sizeof(struct epoll_event) * num_sockets_per_sender);
 223         if (events == NULL) {
 224                 perror("malloc");
 225                 exit(1);
 226         }
 227
 228         // fill the buffer with random junk
 229         for (i = 0; i < 65536; ++i)
 230                 buf[i] = rand() & 0xff;
 231
 232         // allocate all the senders
 233         for (i = 0; i < num_sockets_per_sender; ++i)
 234                 generate_new_sender(ep_fd);
 235
 236         for ( ;; ) {
 237                 int num_active = epoll_wait(ep_fd, events, num_sockets_per_sender, -1);
 238                 if (num_active == -1) {
 239                         perror("epoll_wait");
 240                         exit(1);
 241                 }
 242
 243                 for (i = 0; i < num_active; ++i) {
 244                         struct sender *s = (struct sender *)events[i].data.ptr;
 245                         unsigned long long bytes_to_send = s->bytes_left;
 246                         unsigned ret;
 247
 248                         if (bytes_to_send > 65536) {
 249                                 bytes_to_send = 65536;
 250                         }
 251
 252                         ret = send(s->fd, buf, bytes_to_send, MSG_NOSIGNAL);
 253                         if (ret == -1) {
 254                                 perror("send()");
 255                                 exit(1);
 256                         }
 257
 258                         s->bytes_left -= ret;
 259                         bytes_sent += ret;
 260
 261                         // update the central counter after every 1MB (8ms
 262                         // at gigabit speeds, should be enough) of sent data
 263                         if (bytes_sent > 1048576) {
 264                                 pthread_mutex_lock(&send_mutex);
 265                                 total_bytes_sent += bytes_sent;
 266                                 pthread_mutex_unlock(&send_mutex);
 267
 268                                 bytes_sent = 0;
 269                         }
 270
 271                         if (s->bytes_left == 0) {
 272                                 if (epoll_ctl(ep_fd, EPOLL_CTL_DEL, s->fd, NULL) == -1) {
 273                                         perror("EPOLL_CTL_ADD");
 274                                         exit(1);
 275                                 }
 276                                 close(s->fd);
 277
 278                                 free(s);
 279                                 generate_new_sender(ep_fd);
 280                         }
 281                 }
 282         }
 283
 284         pthread_mutex_lock(&send_mutex);
 285         total_bytes_sent += bytes_sent;
 286         pthread_mutex_unlock(&send_mutex);
 287
 288         free(events);
 289         close(ep_fd);
 290
 291         pthread_exit(0);
 292 }
 293
 294 void *receiver_worker(void *arg)
 295 {
 296         int sock = (int)arg;
 297         char buf[65536];
 298         unsigned long long bytes_received = 0;
 299
 300         for ( ;; ) {
 301                 int ret = read(sock, buf, 65536);
 302                 if (ret == 0)
 303                         break;
 304
 305                 bytes_received += ret;
 306
 307                 // update the central counter after every 1MB (8ms
 308                 // at gigabit speeds, should be enough) of received data
 309                 if (bytes_received > 1048576) {
 310                         pthread_mutex_lock(&receive_mutex);
 311                         total_bytes_received += bytes_received;
 312                         pthread_mutex_unlock(&receive_mutex);
 313
 314                         bytes_received = 0;
 315                 }
 316         }
 317
 318         if (close(sock) == -1) {
 319                 perror("close()");
 320                 exit(1);
 321         }
 322
 323         pthread_mutex_lock(&receive_mutex);
 324         total_bytes_received += bytes_received;
 325         pthread_mutex_unlock(&receive_mutex);
 326
 327         pthread_exit(0);
 328 }
 329
 330 void *receiver_dispatcher(void *arg)
 331 {
 332         int server_sock = (int)arg;
 333         pthread_attr_t attr;
 334
 335         // FIXME: these do not really set errno
 336         if (pthread_attr_init(&attr) != 0) {
 337                 perror("pthread_attr_init()");
 338                 exit(1);
 339         }
 340
 341         if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN + 65536 + 0x4000) != 0) {
 342                 perror("pthread_attr_setstacksize");
 343                 exit(1);
 344         }
 345
 346         if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0) {
 347                 perror("pthread_attr_setdetachstate");
 348                 exit(1);
 349         }
 350
 351         /*
 352          * Listen for incoming connections, spawning off one receiver
 353          * thread for each (which will just gobble up the data until
 354          * we're done).
 355          */
 356         for ( ;; ) {
 357                 struct sockaddr_in addr;
 358                 socklen_t addr_len = sizeof(addr);
 359                 pthread_t thread;
 360
 361                 int sock = accept(server_sock, (struct sockaddr *)&addr, &addr_len);
 362                 if (sock == -1) {
 363                         perror("accept()");
 364                         exit(1);
 365                 }
 366
 367                 if (pthread_create(&thread, &attr, receiver_worker, (void *)sock) != 0) {
 368                         perror("pthread_create()");
 369                         exit(1);
 370                 }
 371         }
 372 }
 373
 374 int get_server_socket(unsigned short port)
 375 {
 376         int server_sock;
 377         struct sockaddr_in sin;
 378         unsigned one = 1;
 379
 380         server_sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 381         if (server_sock == -1) {
 382                 perror("socket()");
 383                 exit(1);
 384         }
 385
 386         if (setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) == -1) {
 387                 perror("setsocket(SO_REUSEADDR)");
 388                 exit(1);
 389         }
 390
 391         sin.sin_family = AF_INET;
 392         sin.sin_port = htons(port);
 393         sin.sin_addr.s_addr = INADDR_ANY;
 394
 395         if (bind(server_sock, (struct sockaddr *)&sin, sizeof(struct sockaddr)) == -1) {
 396                 perror("bind()");
 397                 exit(1);
 398         }
 399
 400         if (listen(server_sock, 255) == -1) {
 401                 perror("listen()");
 402                 exit(1);
 403         }
 404
 405         return server_sock;
 406 }
 407
 408 int main(int argc, char **argv)
 409 {
 410         int server_sock;
 411         unsigned i;
 412         pthread_attr_t attr;
 413
 414         parse_options(argc, argv);
 415
 416         if (destinations == NULL || sources == NULL) {
 417                 fprintf(stderr, "Missing or empty source or destination host list. Aborting.\n");
 418                 exit(1);
 419         }
 420
 421         if (do_listen) {
 422                 server_sock = get_server_socket(port);
 423         }
 424
 425         printf("Sending data on port %u from %u sources to %u destinations.\n\n",
 426                 port, num_sources, num_destinations);
 427
 428         // FIXME: these do not really set errno
 429         if (pthread_attr_init(&attr) != 0) {
 430                 perror("pthread_attr_init()");
 431                 exit(1);
 432         }
 433
 434         if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN + 65536 + 0x4000) != 0) {
 435                 perror("pthread_attr_setstacksize");
 436                 exit(1);
 437         }
 438
 439         if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0) {
 440                 perror("pthread_attr_setdetachstate");
 441                 exit(1);
 442         }
 443
 444         // Fire off the master receiver.
 445         if (do_listen) {
 446                 pthread_t thread;
 447                 if (pthread_create(&thread, &attr, receiver_dispatcher, (void *)server_sock) != 0) {
 448                         perror("pthread_create()");
 449                         exit(1);
 450                 }
 451         }
 452
 453         printf("Waiting five seconds before starting senders...\n");
 454         sleep(5);
 455
 456         // Fire off sender workers.
 457         for (i = 0; i < num_senders; ++i) {
 458                 pthread_t thread;
 459
 460                 if (pthread_create(&thread, &attr, sender_worker, NULL) != 0) {
 461                         perror("pthread_create()");
 462                         exit(1);
 463                 }
 464         }
 465
 466         // Just stay around collecting statistics until we're done.
 467         for ( ;; ) {
 468                 unsigned long long sent, received;
 469                 static unsigned long long last_sent = 0, last_received = 0;
 470                 double recv_rate, send_rate;
 471
 472                 pthread_mutex_lock(&send_mutex);
 473                 sent = total_bytes_sent;
 474                 pthread_mutex_unlock(&send_mutex);
 475
 476                 pthread_mutex_lock(&receive_mutex);
 477                 received = total_bytes_received;
 478                 pthread_mutex_unlock(&receive_mutex);
 479
 480                 send_rate = (sent - last_sent) * 8.0 / 1048576.0;
 481                 recv_rate = (received - last_received) * 8.0 / 1048576.0;
 482
 483                 printf("%12llu %12llu  %5.0f Mbit/sec  %5.0f Mbit/sec\n", sent, received,
 484                         send_rate, recv_rate);
 485
 486                 last_sent = sent;
 487                 last_received = received;
 488
 489                 sleep(1);
 490         }
 491
 492         exit(0);
 493 }