child.c

   1 /*
   2    dbench version 3
   3
   4    Copyright (C) Andrew Tridgell 1999-2004
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 /* This file links against either fileio.c to do operations against a
  21    local filesystem (making dbench), or sockio.c to issue SMB-like
  22    command packets over a socket (making tbench).
  23
  24    So, the pattern of operations and the control structure is the same
  25    for both benchmarks, but the operations performed are different.
  26 */
  27
  28 #include "dbench.h"
  29
  30 #define ival(s) strtol(s, NULL, 0)
  31
  32 static void nb_sleep(int usec)
  33 {
  34         usleep(usec);
  35 }
  36
  37
  38 static void nb_target_rate(struct child_struct *child, double rate)
  39 {
  40         double tdelay;
  41
  42         if (child->rate.last_bytes == 0) {
  43                 child->rate.last_bytes = child->bytes;
  44                 child->rate.last_time = timeval_current();
  45                 return;
  46         }
  47
  48         if (rate != 0) {
  49                 tdelay = (child->bytes - child->rate.last_bytes)/(1.0e6*rate) -
  50                         timeval_elapsed(&child->rate.last_time);
  51         } else {
  52                 tdelay = - timeval_elapsed(&child->rate.last_time);
  53         }
  54         if (tdelay > 0 && rate != 0) {
  55                 msleep(tdelay*1000);
  56         } else {
  57                 child->max_latency = MAX(child->max_latency, -tdelay);
  58         }
  59
  60         child->rate.last_time = timeval_current();
  61         child->rate.last_bytes = child->bytes;
  62 }
  63
  64 static void nb_time_reset(struct child_struct *child)
  65 {
  66         child->starttime = timeval_current();
  67         memset(&child->rate, 0, sizeof(child->rate));
  68 }
  69
  70 static void nb_time_delay(struct child_struct *child, double targett)
  71 {
  72         double elapsed = timeval_elapsed(&child->starttime);
  73         if (targett > elapsed) {
  74                 msleep(1000*(targett - elapsed));
  75         } else if (elapsed - targett > child->max_latency) {
  76                 child->max_latency = MAX(elapsed - targett, child->max_latency);
  77         }
  78 }
  79
  80 static void finish_op(struct child_struct *child, struct op *op)
  81 {
  82         double t = timeval_elapsed(&child->lasttime);
  83         op->count++;
  84         op->total_time += t;
  85         if (t > op->max_latency) {
  86                 op->max_latency = t;
  87         }
  88 }
  89
  90 #define OP_LATENCY(opname) finish_op(child, &child->op.op_ ## opname)
  91
  92 /*
  93   one child operation
  94  */
  95 static void child_op(struct child_struct *child, const char *opname,
  96                      const char *fname, const char *fname2,
  97                      char **params, const char *status)
  98 {
  99         struct dbench_op op;
 100         unsigned i;
 101
 102         child->lasttime = timeval_current();
 103
 104         ZERO_STRUCT(op);
 105         op.child = child;
 106         op.op = opname;
 107         op.fname = fname;
 108         op.fname2 = fname2;
 109         op.status = status;
 110         for (i=0;i<sizeof(op.params)/sizeof(op.params[0]);i++) {
 111                 op.params[i] = params[i]?ival(params[i]):0;
 112         }
 113
 114         if (strcasecmp(op.op, "Sleep") == 0) {
 115                 nb_sleep(op.params[0]);
 116                 return;
 117         }
 118
 119         for (i=0;nb_ops->ops[i].name;i++) {
 120                 if (strcasecmp(op.op, nb_ops->ops[i].name) == 0) {
 121                         nb_ops->ops[i].fn(&op);
 122                         finish_op(child, &child->ops[i]);
 123                         return;
 124                 }
 125         }
 126
 127         printf("[%u] Unknown operation %s in pid %u\n",
 128                child->line, op.op, (unsigned)getpid());
 129 }
 130
 131
 132 /* run a test that simulates an approximate netbench client load */
 133 void child_run(struct child_struct *child0, const char *loadfile)
 134 {
 135         int i;
 136         char line[1024], fname[1024], fname2[1024];
 137         char **sparams, **params;
 138         char *p;
 139         const char *status;
 140         FILE *f;
 141         pid_t parent = getppid();
 142         double targett;
 143         struct child_struct *child;
 144
 145         for (child=child0;child<child0+options.clients_per_process;child++) {
 146                 child->line = 0;
 147                 asprintf(&child->cname,"client%d", child->id);
 148         }
 149
 150         sparams = calloc(20, sizeof(char *));
 151         for (i=0;i<20;i++) {
 152                 sparams[i] = malloc(100);
 153         }
 154
 155         f = fopen(loadfile, "r");
 156         if (f == NULL) {
 157                 perror(loadfile);
 158                 exit(1);
 159         }
 160
 161 again:
 162         for (child=child0;child<child0+options.clients_per_process;child++) {
 163                 nb_time_reset(child);
 164         }
 165
 166         while (fgets(line, sizeof(line)-1, f)) {
 167                 params = sparams;
 168
 169                 if (kill(parent, 0) == -1) {
 170                         exit(1);
 171                 }
 172
 173                 for (child=child0;child<child0+options.clients_per_process;child++) {
 174                         if (child->done) goto done;
 175                         child->line++;
 176                 }
 177
 178                 line[strlen(line)-1] = 0;
 179
 180                 all_string_sub(line,"\\", "/");
 181                 all_string_sub(line," /", " ");
 182
 183                 p = line;
 184                 for (i=0;
 185                      i<19 && next_token(&p, params[i], " ");
 186                      i++) ;
 187
 188                 params[i][0] = 0;
 189
 190                 if (i < 2 || params[0][0] == '#') continue;
 191
 192                 if (!strncmp(params[0],"SMB", 3)) {
 193                         printf("ERROR: You are using a dbench 1 load file\n");
 194                         exit(1);
 195                 }
 196
 197                 if (i > 0 && isdigit(params[0][0])) {
 198                         targett = strtod(params[0], NULL);
 199                         params++;
 200                         i--;
 201                 } else {
 202                         targett = 0.0;
 203                 }
 204
 205                 if (strncmp(params[i-1], "NT_STATUS_", 10) != 0 &&
 206                     strncmp(params[i-1], "0x", 2) != 0 &&
 207                     strncmp(params[i-1], "*", 1) != 0) {
 208                         printf("Badly formed status at line %d\n", child->line);
 209                         continue;
 210                 }
 211
 212                 status = params[i-1];
 213
 214                 for (child=child0;child<child0+options.clients_per_process;child++) {
 215                         int pcount = 1;
 216
 217                         fname[0] = 0;
 218                         fname2[0] = 0;
 219
 220                         if (i>1 && params[1][0] == '/') {
 221                                 snprintf(fname, sizeof(fname), "%s%s", child->directory, params[1]);
 222                                 all_string_sub(fname,"client1", child->cname);
 223                                 pcount++;
 224                         }
 225                         if (i>2 && params[2][0] == '/') {
 226                                 snprintf(fname2, sizeof(fname2), "%s%s", child->directory, params[2]);
 227                                 all_string_sub(fname2,"client1", child->cname);
 228                                 pcount++;
 229                         }
 230
 231                         if (options.targetrate != 0 || targett == 0.0) {
 232                                 nb_target_rate(child, options.targetrate);
 233                         } else {
 234                                 nb_time_delay(child, targett);
 235                         }
 236                         child_op(child, params[0], fname, fname2, params+pcount, status);
 237                 }
 238         }
 239
 240         if (options.run_once) {
 241                 goto done;
 242         }
 243
 244         rewind(f);
 245         goto again;
 246
 247 done:
 248         fclose(f);
 249         for (child=child0;child<child0+options.clients_per_process;child++) {
 250                 child->cleanup = 1;
 251                 fflush(stdout);
 252                 if (!options.skip_cleanup) {
 253                         nb_ops->cleanup(child);
 254                 }
 255                 child->cleanup_finished = 1;
 256         }
 257 }