benchmark.c

   1 /* Redis benchmark utility.
   2  *
   3  * Copyright (c) 2006-2009, Salvatore Sanfilippo <antirez at gmail dot com>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  *   * Redistributions of source code must retain the above copyright notice,
  10  *     this list of conditions and the following disclaimer.
  11  *   * Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  *   * Neither the name of Redis nor the names of its contributors may be used
  15  *     to endorse or promote products derived from this software without
  16  *     specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "fmacros.h"
  32
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <stdlib.h>
  36 #include <unistd.h>
  37 #include <errno.h>
  38 #include <sys/time.h>
  39 #include <signal.h>
  40 #include <assert.h>
  41
  42 #include "ae.h"
  43 #include "anet.h"
  44 #include "sds.h"
  45 #include "adlist.h"
  46 #include "zmalloc.h"
  47
  48 #define REPLY_INT 0
  49 #define REPLY_RETCODE 1
  50 #define REPLY_BULK 2
  51 #define REPLY_MBULK 3
  52
  53 #define CLIENT_CONNECTING 0
  54 #define CLIENT_SENDQUERY 1
  55 #define CLIENT_READREPLY 2
  56
  57 #define MAX_LATENCY 5000
  58
  59 #define REDIS_NOTUSED(V) ((void) V)
  60
  61 static struct config {
  62     int debug;
  63     int numclients;
  64     int requests;
  65     int liveclients;
  66     int donerequests;
  67     int keysize;
  68     int datasize;
  69     int randomkeys;
  70     int randomkeys_keyspacelen;
  71     aeEventLoop *el;
  72     char *hostip;
  73     int hostport;
  74     int keepalive;
  75     long long start;
  76     long long totlatency;
  77     int *latency;
  78     list *clients;
  79     int quiet;
  80     int loop;
  81 } config;
  82
  83 typedef struct _client {
  84     int state;
  85     int fd;
  86     sds obuf;
  87     sds ibuf;
  88     int mbulk;          /* Number of elements in an mbulk reply */
  89     int readlen;        /* readlen == -1 means read a single line */
  90     int totreceived;
  91     unsigned int written;        /* bytes of 'obuf' already written */
  92     int replytype;
  93     long long start;    /* start time in milliseconds */
  94 } *client;
  95
  96 /* Prototypes */
  97 static void writeHandler(aeEventLoop *el, int fd, void *privdata, int mask);
  98 static void createMissingClients(client c);
  99
 100 /* Implementation */
 101 static long long mstime(void) {
 102     struct timeval tv;
 103     long long mst;
 104
 105     gettimeofday(&tv, NULL);
 106     mst = ((long)tv.tv_sec)*1000;
 107     mst += tv.tv_usec/1000;
 108     return mst;
 109 }
 110
 111 static void freeClient(client c) {
 112     listNode *ln;
 113
 114     aeDeleteFileEvent(config.el,c->fd,AE_WRITABLE);
 115     aeDeleteFileEvent(config.el,c->fd,AE_READABLE);
 116     sdsfree(c->ibuf);
 117     sdsfree(c->obuf);
 118     close(c->fd);
 119     zfree(c);
 120     config.liveclients--;
 121     ln = listSearchKey(config.clients,c);
 122     assert(ln != NULL);
 123     listDelNode(config.clients,ln);
 124 }
 125
 126 static void freeAllClients(void) {
 127     listNode *ln = config.clients->head, *next;
 128
 129     while(ln) {
 130         next = ln->next;
 131         freeClient(ln->value);
 132         ln = next;
 133     }
 134 }
 135
 136 static void resetClient(client c) {
 137     aeDeleteFileEvent(config.el,c->fd,AE_WRITABLE);
 138     aeDeleteFileEvent(config.el,c->fd,AE_READABLE);
 139     aeCreateFileEvent(config.el,c->fd, AE_WRITABLE,writeHandler,c,NULL);
 140     sdsfree(c->ibuf);
 141     c->ibuf = sdsempty();
 142     c->readlen = (c->replytype == REPLY_BULK ||
 143                   c->replytype == REPLY_MBULK) ? -1 : 0;
 144     c->mbulk = -1;
 145     c->written = 0;
 146     c->totreceived = 0;
 147     c->state = CLIENT_SENDQUERY;
 148     c->start = mstime();
 149     createMissingClients(c);
 150 }
 151
 152 static void randomizeClientKey(client c) {
 153     char *p;
 154     char buf[32];
 155     long r;
 156
 157     p = strstr(c->obuf, "_rand");
 158     if (!p) return;
 159     p += 5;
 160     r = random() % config.randomkeys_keyspacelen;
 161     sprintf(buf,"%ld",r);
 162     memcpy(p,buf,strlen(buf));
 163 }
 164
 165 static void prepareClientForReply(client c, int type) {
 166     if (type == REPLY_BULK) {
 167         c->replytype = REPLY_BULK;
 168         c->readlen = -1;
 169     } else if (type == REPLY_MBULK) {
 170         c->replytype = REPLY_MBULK;
 171         c->readlen = -1;
 172         c->mbulk = -1;
 173     } else {
 174         c->replytype = type;
 175         c->readlen = 0;
 176     }
 177 }
 178
 179 static void clientDone(client c) {
 180     static int last_tot_received = 1;
 181
 182     long long latency;
 183     config.donerequests ++;
 184     latency = mstime() - c->start;
 185     if (latency > MAX_LATENCY) latency = MAX_LATENCY;
 186     config.latency[latency]++;
 187
 188     if (config.debug && last_tot_received != c->totreceived) {
 189         printf("Tot bytes received: %d\n", c->totreceived);
 190         last_tot_received = c->totreceived;
 191     }
 192     if (config.donerequests == config.requests) {
 193         freeClient(c);
 194         aeStop(config.el);
 195         return;
 196     }
 197     if (config.keepalive) {
 198         resetClient(c);
 199         if (config.randomkeys) randomizeClientKey(c);
 200     } else {
 201         config.liveclients--;
 202         createMissingClients(c);
 203         config.liveclients++;
 204         freeClient(c);
 205     }
 206 }
 207
 208 static void readHandler(aeEventLoop *el, int fd, void *privdata, int mask)
 209 {
 210     char buf[1024];
 211     int nread;
 212     client c = privdata;
 213     REDIS_NOTUSED(el);
 214     REDIS_NOTUSED(fd);
 215     REDIS_NOTUSED(mask);
 216
 217     nread = read(c->fd, buf, 1024);
 218     if (nread == -1) {
 219         fprintf(stderr, "Reading from socket: %s\n", strerror(errno));
 220         freeClient(c);
 221         return;
 222     }
 223     if (nread == 0) {
 224         fprintf(stderr, "EOF from client\n");
 225         freeClient(c);
 226         return;
 227     }
 228     c->totreceived += nread;
 229     c->ibuf = sdscatlen(c->ibuf,buf,nread);
 230
 231 processdata:
 232     /* Are we waiting for the first line of the command of for  sdf
 233      * count in bulk or multi bulk operations? */
 234     if (c->replytype == REPLY_INT ||
 235         c->replytype == REPLY_RETCODE ||
 236         (c->replytype == REPLY_BULK && c->readlen == -1) ||
 237         (c->replytype == REPLY_MBULK && c->readlen == -1) ||
 238         (c->replytype == REPLY_MBULK && c->mbulk == -1)) {
 239         char *p;
 240
 241         /* Check if the first line is complete. This is only true if
 242          * there is a newline inside the buffer. */
 243         if ((p = strchr(c->ibuf,'\n')) != NULL) {
 244             if (c->replytype == REPLY_BULK ||
 245                 (c->replytype == REPLY_MBULK && c->mbulk != -1))
 246             {
 247                 /* Read the count of a bulk reply (being it a single bulk or
 248                  * a multi bulk reply). "$<count>" for the protocol spec. */
 249                 *p = '\0';
 250                 *(p-1) = '\0';
 251                 c->readlen = atoi(c->ibuf+1)+2;
 252                 // printf("BULK ATOI: %s\n", c->ibuf+1);
 253                 /* Handle null bulk reply "$-1" */
 254                 if (c->readlen-2 == -1) {
 255                     clientDone(c);
 256                     return;
 257                 }
 258                 /* Leave all the rest in the input buffer */
 259                 c->ibuf = sdsrange(c->ibuf,(p-c->ibuf)+1,-1);
 260                 /* fall through to reach the point where the code will try
 261                  * to check if the bulk reply is complete. */
 262             } else if (c->replytype == REPLY_MBULK && c->mbulk == -1) {
 263                 /* Read the count of a multi bulk reply. That is, how many
 264                  * bulk replies we have to read next. "*<count>" protocol. */
 265                 *p = '\0';
 266                 *(p-1) = '\0';
 267                 c->mbulk = atoi(c->ibuf+1);
 268                 /* Handle null bulk reply "*-1" */
 269                 if (c->mbulk == -1) {
 270                     clientDone(c);
 271                     return;
 272                 }
 273                 // printf("%p) %d elements list\n", c, c->mbulk);
 274                 /* Leave all the rest in the input buffer */
 275                 c->ibuf = sdsrange(c->ibuf,(p-c->ibuf)+1,-1);
 276                 goto processdata;
 277             } else {
 278                 c->ibuf = sdstrim(c->ibuf,"\r\n");
 279                 clientDone(c);
 280                 return;
 281             }
 282         }
 283     }
 284     /* bulk read, did we read everything? */
 285     if (((c->replytype == REPLY_MBULK && c->mbulk != -1) ||
 286          (c->replytype == REPLY_BULK)) && c->readlen != -1 &&
 287           (unsigned)c->readlen <= sdslen(c->ibuf))
 288     {
 289         // printf("BULKSTATUS mbulk:%d readlen:%d sdslen:%d\n",
 290         //    c->mbulk,c->readlen,sdslen(c->ibuf));
 291         if (c->replytype == REPLY_BULK) {
 292             clientDone(c);
 293         } else if (c->replytype == REPLY_MBULK) {
 294             // printf("%p) %d (%d)) ",c, c->mbulk, c->readlen);
 295             // fwrite(c->ibuf,c->readlen,1,stdout);
 296             // printf("\n");
 297             if (--c->mbulk == 0) {
 298                 clientDone(c);
 299             } else {
 300                 c->ibuf = sdsrange(c->ibuf,c->readlen,-1);
 301                 c->readlen = -1;
 302                 goto processdata;
 303             }
 304         }
 305     }
 306 }
 307
 308 static void writeHandler(aeEventLoop *el, int fd, void *privdata, int mask)
 309 {
 310     client c = privdata;
 311     REDIS_NOTUSED(el);
 312     REDIS_NOTUSED(fd);
 313     REDIS_NOTUSED(mask);
 314
 315     if (c->state == CLIENT_CONNECTING) {
 316         c->state = CLIENT_SENDQUERY;
 317         c->start = mstime();
 318     }
 319     if (sdslen(c->obuf) > c->written) {
 320         void *ptr = c->obuf+c->written;
 321         int len = sdslen(c->obuf) - c->written;
 322         int nwritten = write(c->fd, ptr, len);
 323         if (nwritten == -1) {
 324             fprintf(stderr, "Writing to socket: %s\n", strerror(errno));
 325             freeClient(c);
 326             return;
 327         }
 328         c->written += nwritten;
 329         if (sdslen(c->obuf) == c->written) {
 330             aeDeleteFileEvent(config.el,c->fd,AE_WRITABLE);
 331             aeCreateFileEvent(config.el,c->fd,AE_READABLE,readHandler,c,NULL);
 332             c->state = CLIENT_READREPLY;
 333         }
 334     }
 335 }
 336
 337 static client createClient(void) {
 338     client c = zmalloc(sizeof(struct _client));
 339     char err[ANET_ERR_LEN];
 340
 341     c->fd = anetTcpNonBlockConnect(err,config.hostip,config.hostport);
 342     if (c->fd == ANET_ERR) {
 343         zfree(c);
 344         fprintf(stderr,"Connect: %s\n",err);
 345         return NULL;
 346     }
 347     anetTcpNoDelay(NULL,c->fd);
 348     c->obuf = sdsempty();
 349     c->ibuf = sdsempty();
 350     c->mbulk = -1;
 351     c->readlen = 0;
 352     c->written = 0;
 353     c->totreceived = 0;
 354     c->state = CLIENT_CONNECTING;
 355     aeCreateFileEvent(config.el, c->fd, AE_WRITABLE, writeHandler, c, NULL);
 356     config.liveclients++;
 357     listAddNodeTail(config.clients,c);
 358     return c;
 359 }
 360
 361 static void createMissingClients(client c) {
 362     while(config.liveclients < config.numclients) {
 363         client new = createClient();
 364         if (!new) continue;
 365         sdsfree(new->obuf);
 366         new->obuf = sdsdup(c->obuf);
 367         if (config.randomkeys) randomizeClientKey(c);
 368         new->replytype = c->replytype;
 369         if (c->replytype == REPLY_BULK)
 370             new->readlen = -1;
 371     }
 372 }
 373
 374 static void showLatencyReport(char *title) {
 375     int j, seen = 0;
 376     float perc, reqpersec;
 377
 378     reqpersec = (float)config.donerequests/((float)config.totlatency/1000);
 379     if (!config.quiet) {
 380         printf("====== %s ======\n", title);
 381         printf("  %d requests completed in %.2f seconds\n", config.donerequests,
 382             (float)config.totlatency/1000);
 383         printf("  %d parallel clients\n", config.numclients);
 384         printf("  %d bytes payload\n", config.datasize);
 385         printf("  keep alive: %d\n", config.keepalive);
 386         printf("\n");
 387         for (j = 0; j <= MAX_LATENCY; j++) {
 388             if (config.latency[j]) {
 389                 seen += config.latency[j];
 390                 perc = ((float)seen*100)/config.donerequests;
 391                 printf("%.2f%% <= %d milliseconds\n", perc, j);
 392             }
 393         }
 394         printf("%.2f requests per second\n\n", reqpersec);
 395     } else {
 396         printf("%s: %.2f requests per second\n", title, reqpersec);
 397     }
 398 }
 399
 400 static void prepareForBenchmark(void)
 401 {
 402     memset(config.latency,0,sizeof(int)*(MAX_LATENCY+1));
 403     config.start = mstime();
 404     config.donerequests = 0;
 405 }
 406
 407 static void endBenchmark(char *title) {
 408     config.totlatency = mstime()-config.start;
 409     showLatencyReport(title);
 410     freeAllClients();
 411 }
 412
 413 void parseOptions(int argc, char **argv) {
 414     int i;
 415
 416     for (i = 1; i < argc; i++) {
 417         int lastarg = i==argc-1;
 418
 419         if (!strcmp(argv[i],"-c") && !lastarg) {
 420             config.numclients = atoi(argv[i+1]);
 421             i++;
 422         } else if (!strcmp(argv[i],"-n") && !lastarg) {
 423             config.requests = atoi(argv[i+1]);
 424             i++;
 425         } else if (!strcmp(argv[i],"-k") && !lastarg) {
 426             config.keepalive = atoi(argv[i+1]);
 427             i++;
 428         } else if (!strcmp(argv[i],"-h") && !lastarg) {
 429             char *ip = zmalloc(32);
 430             if (anetResolve(NULL,argv[i+1],ip) == ANET_ERR) {
 431                 printf("Can't resolve %s\n", argv[i]);
 432                 exit(1);
 433             }
 434             config.hostip = ip;
 435             i++;
 436         } else if (!strcmp(argv[i],"-p") && !lastarg) {
 437             config.hostport = atoi(argv[i+1]);
 438             i++;
 439         } else if (!strcmp(argv[i],"-d") && !lastarg) {
 440             config.datasize = atoi(argv[i+1]);
 441             i++;
 442             if (config.datasize < 1) config.datasize=1;
 443             if (config.datasize > 1024*1024) config.datasize = 1024*1024;
 444         } else if (!strcmp(argv[i],"-r") && !lastarg) {
 445             config.randomkeys = 1;
 446             config.randomkeys_keyspacelen = atoi(argv[i+1]);
 447             if (config.randomkeys_keyspacelen < 0)
 448                 config.randomkeys_keyspacelen = 0;
 449             i++;
 450         } else if (!strcmp(argv[i],"-q")) {
 451             config.quiet = 1;
 452         } else if (!strcmp(argv[i],"-l")) {
 453             config.loop = 1;
 454         } else if (!strcmp(argv[i],"-D")) {
 455             config.debug = 1;
 456         } else {
 457             printf("Wrong option '%s' or option argument missing\n\n",argv[i]);
 458             printf("Usage: redis-benchmark [-h <host>] [-p <port>] [-c <clients>] [-n <requests]> [-k <boolean>]\n\n");
 459             printf(" -h <hostname>      Server hostname (default 127.0.0.1)\n");
 460             printf(" -p <hostname>      Server port (default 6379)\n");
 461             printf(" -c <clients>       Number of parallel connections (default 50)\n");
 462             printf(" -n <requests>      Total number of requests (default 10000)\n");
 463             printf(" -d <size>          Data size of SET/GET value in bytes (default 2)\n");
 464             printf(" -k <boolean>       1=keep alive 0=reconnect (default 1)\n");
 465             printf(" -r <keyspacelen>   Use random keys for SET/GET/INCR\n");
 466             printf("  Using this option the benchmark will get/set keys\n");
 467             printf("  in the form mykey_rand000000012456 instead of constant\n");
 468             printf("  keys, the <keyspacelen> argument determines the max\n");
 469             printf("  number of values for the random number. For instance\n");
 470             printf("  if set to 10 only rand000000000000 - rand000000000009\n");
 471             printf("  range will be allowed.\n");
 472             printf(" -q                 Quiet. Just show query/sec values\n");
 473             printf(" -l                 Loop. Run the tests forever\n");
 474             printf(" -D                 Debug mode. more verbose.\n");
 475             exit(1);
 476         }
 477     }
 478 }
 479
 480 int main(int argc, char **argv) {
 481     client c;
 482
 483     signal(SIGHUP, SIG_IGN);
 484     signal(SIGPIPE, SIG_IGN);
 485
 486     config.debug = 0;
 487     config.numclients = 50;
 488     config.requests = 10000;
 489     config.liveclients = 0;
 490     config.el = aeCreateEventLoop();
 491     config.keepalive = 1;
 492     config.donerequests = 0;
 493     config.datasize = 3;
 494     config.randomkeys = 0;
 495     config.randomkeys_keyspacelen = 0;
 496     config.quiet = 0;
 497     config.loop = 0;
 498     config.latency = NULL;
 499     config.clients = listCreate();
 500     config.latency = zmalloc(sizeof(int)*(MAX_LATENCY+1));
 501
 502     config.hostip = "127.0.0.1";
 503     config.hostport = 6379;
 504
 505     parseOptions(argc,argv);
 506
 507     if (config.keepalive == 0) {
 508         printf("WARNING: keepalive disabled, you probably need 'echo 1 > /proc/sys/net/ipv4/tcp_tw_reuse' for Linux and 'sudo sysctl -w net.inet.tcp.msl=1000' for Mac OS X in order to use a lot of clients/requests\n");
 509     }
 510
 511     do {
 512         prepareForBenchmark();
 513         c = createClient();
 514         if (!c) exit(1);
 515         c->obuf = sdscatprintf(c->obuf,"SET foo_rand000000000000 %d\r\n",config.datasize);
 516         {
 517             char *data = zmalloc(config.datasize+2);
 518             memset(data,'x',config.datasize);
 519             data[config.datasize] = '\r';
 520             data[config.datasize+1] = '\n';
 521             c->obuf = sdscatlen(c->obuf,data,config.datasize+2);
 522         }
 523         prepareClientForReply(c,REPLY_RETCODE);
 524         createMissingClients(c);
 525         aeMain(config.el);
 526         endBenchmark("SET");
 527
 528         prepareForBenchmark();
 529         c = createClient();
 530         if (!c) exit(1);
 531         c->obuf = sdscat(c->obuf,"GET foo_rand000000000000\r\n");
 532         prepareClientForReply(c,REPLY_BULK);
 533         createMissingClients(c);
 534         aeMain(config.el);
 535         endBenchmark("GET");
 536
 537         prepareForBenchmark();
 538         c = createClient();
 539         if (!c) exit(1);
 540         c->obuf = sdscat(c->obuf,"INCR counter_rand000000000000\r\n");
 541         prepareClientForReply(c,REPLY_INT);
 542         createMissingClients(c);
 543         aeMain(config.el);
 544         endBenchmark("INCR");
 545
 546         prepareForBenchmark();
 547         c = createClient();
 548         if (!c) exit(1);
 549         c->obuf = sdscat(c->obuf,"LPUSH mylist 3\r\nbar\r\n");
 550         prepareClientForReply(c,REPLY_INT);
 551         createMissingClients(c);
 552         aeMain(config.el);
 553         endBenchmark("LPUSH");
 554
 555         prepareForBenchmark();
 556         c = createClient();
 557         if (!c) exit(1);
 558         c->obuf = sdscat(c->obuf,"LPOP mylist\r\n");
 559         prepareClientForReply(c,REPLY_BULK);
 560         createMissingClients(c);
 561         aeMain(config.el);
 562         endBenchmark("LPOP");
 563
 564         prepareForBenchmark();
 565         c = createClient();
 566         if (!c) exit(1);
 567         c->obuf = sdscat(c->obuf,"PING\r\n");
 568         prepareClientForReply(c,REPLY_RETCODE);
 569         createMissingClients(c);
 570         aeMain(config.el);
 571         endBenchmark("PING");
 572
 573         prepareForBenchmark();
 574         c = createClient();
 575         if (!c) exit(1);
 576         c->obuf = sdscat(c->obuf,"LPUSH mylist 3\r\nbar\r\n");
 577         prepareClientForReply(c,REPLY_RETCODE);
 578         createMissingClients(c);
 579         aeMain(config.el);
 580         endBenchmark("LPUSH (again, in order to bench LRANGE)");
 581
 582         prepareForBenchmark();
 583         c = createClient();
 584         if (!c) exit(1);
 585         c->obuf = sdscat(c->obuf,"LRANGE mylist 0 99\r\n");
 586         prepareClientForReply(c,REPLY_MBULK);
 587         createMissingClients(c);
 588         aeMain(config.el);
 589         endBenchmark("LRANGE (first 100 elements)");
 590
 591         prepareForBenchmark();
 592         c = createClient();
 593         if (!c) exit(1);
 594         c->obuf = sdscat(c->obuf,"LRANGE mylist 0 299\r\n");
 595         prepareClientForReply(c,REPLY_MBULK);
 596         createMissingClients(c);
 597         aeMain(config.el);
 598         endBenchmark("LRANGE (first 300 elements)");
 599
 600         prepareForBenchmark();
 601         c = createClient();
 602         if (!c) exit(1);
 603         c->obuf = sdscat(c->obuf,"LRANGE mylist 0 449\r\n");
 604         prepareClientForReply(c,REPLY_MBULK);
 605         createMissingClients(c);
 606         aeMain(config.el);
 607         endBenchmark("LRANGE (first 450 elements)");
 608
 609         prepareForBenchmark();
 610         c = createClient();
 611         if (!c) exit(1);
 612         c->obuf = sdscat(c->obuf,"LRANGE mylist 0 599\r\n");
 613         prepareClientForReply(c,REPLY_MBULK);
 614         createMissingClients(c);
 615         aeMain(config.el);
 616         endBenchmark("LRANGE (first 600 elements)");
 617
 618         printf("\n");
 619     } while(config.loop);
 620
 621     return 0;
 622 }