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: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 void generate_new_sender(int ep_fd)
 147 {
 148         int sock, one = 1;
 149         unsigned src_num, dst_num;
 150         unsigned long long num_bytes;
 151         struct sockaddr_in sin;
 152         struct epoll_event ev;
 153
 154         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 155         if (sock == -1) {
 156                 perror("socket()");
 157                 exit(1);
 158         }
 159
 160         // find the right parameters
 161         src_num = (unsigned)(num_sources * gen_uniform_random());
 162         dst_num = (unsigned)(num_destinations * gen_uniform_random());
 163         num_bytes = (unsigned)gen_pareto_random(1048576.0, 1.0);
 164
 165         // FIXME: bind to the right source
 166
 167         if (ioctl(sock, FIONBIO, &one) == -1) {
 168                 perror("FIONBIO");
 169                 exit(1);
 170         }
 171
 172         sin.sin_family = AF_INET;
 173         sin.sin_port = htons(port);
 174         sin.sin_addr = destinations[dst_num];
 175
 176         // non-blocking connect (will be detected by epoll later)
 177         if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) == -1 && errno != EINPROGRESS) {
 178                 perror("connect()");
 179                 exit(1);
 180         }
 181
 182         // stick it in the epoll set (FIXME: make edge-triggered?)
 183         ev.events = EPOLLOUT | EPOLLHUP | EPOLLERR;
 184         ev.data.fd = sock;
 185         ev.data.u64 = num_bytes;
 186
 187         if (epoll_ctl(ep_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
 188                 perror("EPOLL_CTL_ADD");
 189                 exit(1);
 190         }
 191 }
 192
 193 void *sender_worker(void *arg)
 194 {
 195         unsigned i;
 196         char buf[65536];
 197         unsigned long long bytes_sent = 0;
 198         int ep_fd;
 199         struct epoll_event *events;
 200
 201         ep_fd = epoll_create(num_sockets_per_sender);
 202         if (ep_fd == -1) {
 203                 perror("epoll_create");
 204                 exit(1);
 205         }
 206
 207         // malloc, since there might not be enough room on the stack
 208         events = (struct epoll_event *)malloc(sizeof(struct epoll_event) * num_sockets_per_sender);
 209         if (events == NULL) {
 210                 perror("malloc");
 211                 exit(1);
 212         }
 213
 214         // fill the buffer with random junk
 215         for (i = 0; i < 65536; ++i)
 216                 buf[i] = rand() & 0xff;
 217
 218         // allocate all the senders
 219         for (i = 0; i < num_sockets_per_sender; ++i)
 220                 generate_new_sender(ep_fd);
 221
 222         for ( ;; ) {
 223                 int num_active = epoll_wait(ep_fd, events, num_sockets_per_sender, -1);
 224                 if (num_active == -1) {
 225                         perror("epoll_wait");
 226                         exit(1);
 227                 }
 228
 229                 for (i = 0; i < num_active; ++i) {
 230                         unsigned bytes_to_send = events[i].data.u64;
 231                         unsigned ret;
 232
 233                         if (bytes_to_send > 65536) {
 234                                 bytes_to_send = 65536;
 235                         }
 236
 237                         ret = send(events[i].data.fd, buf, bytes_to_send, MSG_NOSIGNAL);
 238                         if (ret == -1) {
 239                                 perror("send()");
 240                                 exit(1);
 241                         }
 242
 243                         events[i].data.u64 -= ret;
 244                         bytes_sent += ret;
 245
 246                         // update the central counter after every 1MB (8ms
 247                         // at gigabit speeds, should be enough) of sent data
 248                         if (bytes_sent > 1048576) {
 249                                 pthread_mutex_lock(&send_mutex);
 250                                 total_bytes_sent += bytes_sent;
 251                                 pthread_mutex_unlock(&send_mutex);
 252
 253                                 bytes_sent = 0;
 254                         }
 255
 256                         if (events[i].data.u64 == 0) {
 257                                 close(events[i].data.fd);
 258                                 if (epoll_ctl(ep_fd, EPOLL_CTL_DEL, events[i].data.fd, NULL) == -1) {
 259                                         perror("EPOLL_CTL_ADD");
 260                                         exit(1);
 261                                 }
 262
 263                                 generate_new_sender(ep_fd);
 264                         }
 265                 }
 266         }
 267
 268         pthread_mutex_lock(&send_mutex);
 269         total_bytes_sent += bytes_sent;
 270         pthread_mutex_unlock(&send_mutex);
 271
 272         free(events);
 273         close(ep_fd);
 274
 275         pthread_exit(0);
 276 }
 277
 278 void *receiver_worker(void *arg)
 279 {
 280         int sock = (int)arg;
 281         char buf[65536];
 282         unsigned long long bytes_received = 0;
 283
 284         for ( ;; ) {
 285                 int ret = read(sock, buf, 65536);
 286                 if (ret == 0)
 287                         break;
 288
 289                 bytes_received += ret;
 290
 291                 // update the central counter after every 1MB (8ms
 292                 // at gigabit speeds, should be enough) of received data
 293                 if (bytes_received > 1048576) {
 294                         pthread_mutex_lock(&receive_mutex);
 295                         total_bytes_received += bytes_received;
 296                         pthread_mutex_unlock(&receive_mutex);
 297
 298                         bytes_received = 0;
 299                 }
 300         }
 301
 302         if (close(sock) == -1) {
 303                 perror("close()");
 304                 exit(1);
 305         }
 306
 307         pthread_mutex_lock(&receive_mutex);
 308         total_bytes_received += bytes_received;
 309         pthread_mutex_unlock(&receive_mutex);
 310
 311         pthread_exit(0);
 312 }
 313
 314 void *receiver_dispatcher(void *arg)
 315 {
 316         int server_sock = (int)arg;
 317         pthread_attr_t attr;
 318
 319         // FIXME: these do not really set errno
 320         if (pthread_attr_init(&attr) != 0) {
 321                 perror("pthread_attr_init()");
 322                 exit(1);
 323         }
 324
 325         if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN + 65536 + 0x4000) != 0) {
 326                 perror("pthread_attr_setstacksize");
 327                 exit(1);
 328         }
 329
 330         if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0) {
 331                 perror("pthread_attr_setdetachstate");
 332                 exit(1);
 333         }
 334
 335         /*
 336          * Listen for incoming connections, spawning off one receiver
 337          * thread for each (which will just gobble up the data until
 338          * we're done).
 339          */
 340         for ( ;; ) {
 341                 struct sockaddr_in addr;
 342                 socklen_t addr_len = sizeof(addr);
 343                 pthread_t thread;
 344
 345                 int sock = accept(server_sock, (struct sockaddr *)&addr, &addr_len);
 346                 if (sock == -1) {
 347                         perror("accept()");
 348                         exit(1);
 349                 }
 350
 351                 if (pthread_create(&thread, &attr, receiver_worker, (void *)sock) != 0) {
 352                         perror("pthread_create()");
 353                         exit(1);
 354                 }
 355         }
 356 }
 357
 358 int get_server_socket(unsigned short port)
 359 {
 360         int server_sock;
 361         struct sockaddr_in sin;
 362         unsigned one = 1;
 363
 364         server_sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 365         if (server_sock == -1) {
 366                 perror("socket()");
 367                 exit(1);
 368         }
 369
 370         if (setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) == -1) {
 371                 perror("setsocket(SO_REUSEADDR)");
 372                 exit(1);
 373         }
 374
 375         sin.sin_family = AF_INET;
 376         sin.sin_port = htons(port);
 377         sin.sin_addr.s_addr = INADDR_ANY;
 378
 379         if (bind(server_sock, (struct sockaddr *)&sin, sizeof(struct sockaddr)) == -1) {
 380                 perror("bind()");
 381                 exit(1);
 382         }
 383
 384         if (listen(server_sock, 255) == -1) {
 385                 perror("listen()");
 386                 exit(1);
 387         }
 388
 389         return server_sock;
 390 }
 391
 392 int main(int argc, char **argv)
 393 {
 394         int server_sock;
 395         unsigned i;
 396         pthread_attr_t attr;
 397
 398         parse_options(argc, argv);
 399
 400         if (destinations == NULL || sources == NULL) {
 401                 fprintf(stderr, "Missing or empty source or destination host list. Aborting.\n");
 402                 exit(1);
 403         }
 404
 405         if (do_listen) {
 406                 server_sock = get_server_socket(port);
 407         }
 408
 409         printf("Sending data on port %u from %u sources to %u destinations.\n\n",
 410                 port, num_sources, num_destinations);
 411
 412         // FIXME: these do not really set errno
 413         if (pthread_attr_init(&attr) != 0) {
 414                 perror("pthread_attr_init()");
 415                 exit(1);
 416         }
 417
 418         if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN + 65536 + 0x4000) != 0) {
 419                 perror("pthread_attr_setstacksize");
 420                 exit(1);
 421         }
 422
 423         if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0) {
 424                 perror("pthread_attr_setdetachstate");
 425                 exit(1);
 426         }
 427
 428         // Fire off the master receiver.
 429         if (do_listen) {
 430                 pthread_t thread;
 431                 if (pthread_create(&thread, &attr, receiver_dispatcher, (void *)server_sock) != 0) {
 432                         perror("pthread_create()");
 433                         exit(1);
 434                 }
 435         }
 436
 437         printf("Waiting five seconds before starting senders...\n");
 438         sleep(5);
 439
 440         // Fire off sender workers.
 441         for (i = 0; i < num_senders; ++i) {
 442                 pthread_t thread;
 443
 444                 if (pthread_create(&thread, &attr, sender_worker, NULL) != 0) {
 445                         perror("pthread_create()");
 446                         exit(1);
 447                 }
 448         }
 449
 450         // Just stay around collecting statistics until we're done.
 451         for ( ;; ) {
 452                 unsigned long long sent, received;
 453                 static unsigned long long last_sent = 0, last_received = 0;
 454                 double recv_rate, send_rate;
 455
 456                 pthread_mutex_lock(&send_mutex);
 457                 sent = total_bytes_sent;
 458                 pthread_mutex_unlock(&send_mutex);
 459
 460                 pthread_mutex_lock(&receive_mutex);
 461                 received = total_bytes_received;
 462                 pthread_mutex_unlock(&receive_mutex);
 463
 464                 send_rate = (sent - last_sent) * 8.0 / 1048576.0;
 465                 recv_rate = (received - last_received) * 8.0 / 1048576.0;
 466
 467                 printf("%12llu %12llu  %5.0f Mbit/sec  %5.0f Mbit/sec\n", sent, received,
 468                         send_rate, recv_rate);
 469
 470                 last_sent = sent;
 471                 last_received = received;
 472
 473                 sleep(1);
 474         }
 475
 476         exit(0);
 477 }