1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * sched-messaging.c 5 * 6 * messaging: Benchmark for scheduler and IPC mechanisms 7 * 8 * Based on hackbench by Rusty Russell <rusty@rustcorp.com.au> 9 * Ported to perf by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp> 10 * 11 */ 12 13 #include <subcmd/parse-options.h> 14 #include "bench.h" 15 16 /* Test groups of 20 processes spraying to 20 receivers */ 17 #include <pthread.h> 18 #include <stdio.h> 19 #include <stdlib.h> 20 #include <string.h> 21 #include <errno.h> 22 #include <unistd.h> 23 #include <sys/types.h> 24 #include <sys/socket.h> 25 #include <sys/wait.h> 26 #include <sys/time.h> 27 #include <poll.h> 28 #include <limits.h> 29 #include <err.h> 30 #include <linux/time64.h> 31 32 #define DATASIZE 100 33 34 static bool use_pipes = false; 35 static unsigned int nr_loops = 100; 36 static bool thread_mode = false; 37 static unsigned int num_groups = 10; 38 39 struct sender_context { 40 unsigned int num_fds; 41 int ready_out; 42 int wakefd; 43 int out_fds[]; 44 }; 45 46 struct receiver_context { 47 unsigned int num_packets; 48 int in_fds[2]; 49 int ready_out; 50 int wakefd; 51 }; 52 53 static void fdpair(int fds[2]) 54 { 55 if (use_pipes) { 56 if (pipe(fds) == 0) 57 return; 58 } else { 59 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0) 60 return; 61 } 62 63 err(EXIT_FAILURE, use_pipes ? "pipe()" : "socketpair()"); 64 } 65 66 /* Block until we're ready to go */ 67 static void ready(int ready_out, int wakefd) 68 { 69 struct pollfd pollfd = { .fd = wakefd, .events = POLLIN }; 70 71 /* Tell them we're ready. */ 72 if (write(ready_out, "R", 1) != 1) 73 err(EXIT_FAILURE, "CLIENT: ready write"); 74 75 /* Wait for "GO" signal */ 76 if (poll(&pollfd, 1, -1) != 1) 77 err(EXIT_FAILURE, "poll"); 78 } 79 80 /* Sender sprays nr_loops messages down each file descriptor */ 81 static void *sender(struct sender_context *ctx) 82 { 83 char data[DATASIZE]; 84 unsigned int i, j; 85 86 ready(ctx->ready_out, ctx->wakefd); 87 memset(data, 'S', sizeof(data)); 88 89 /* Now pump to every receiver. */ 90 for (i = 0; i < nr_loops; i++) { 91 for (j = 0; j < ctx->num_fds; j++) { 92 int ret, done = 0; 93 94 again: 95 ret = write(ctx->out_fds[j], data + done, 96 sizeof(data)-done); 97 if (ret < 0) 98 err(EXIT_FAILURE, "SENDER: write"); 99 done += ret; 100 if (done < DATASIZE) 101 goto again; 102 } 103 } 104 105 return NULL; 106 } 107 108 109 /* One receiver per fd */ 110 static void *receiver(struct receiver_context* ctx) 111 { 112 unsigned int i; 113 114 if (!thread_mode) 115 close(ctx->in_fds[1]); 116 117 /* Wait for start... */ 118 ready(ctx->ready_out, ctx->wakefd); 119 120 /* Receive them all */ 121 for (i = 0; i < ctx->num_packets; i++) { 122 char data[DATASIZE]; 123 int ret, done = 0; 124 125 again: 126 ret = read(ctx->in_fds[0], data + done, DATASIZE - done); 127 if (ret < 0) 128 err(EXIT_FAILURE, "SERVER: read"); 129 done += ret; 130 if (done < DATASIZE) 131 goto again; 132 } 133 134 return NULL; 135 } 136 137 static pthread_t create_worker(void *ctx, void *(*func)(void *)) 138 { 139 pthread_attr_t attr; 140 pthread_t childid; 141 int ret; 142 143 if (!thread_mode) { 144 /* process mode */ 145 /* Fork the receiver. */ 146 switch (fork()) { 147 case -1: 148 err(EXIT_FAILURE, "fork()"); 149 break; 150 case 0: 151 (*func) (ctx); 152 exit(0); 153 break; 154 default: 155 break; 156 } 157 158 return (pthread_t)0; 159 } 160 161 if (pthread_attr_init(&attr) != 0) 162 err(EXIT_FAILURE, "pthread_attr_init:"); 163 164 #ifndef __ia64__ 165 if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0) 166 err(EXIT_FAILURE, "pthread_attr_setstacksize"); 167 #endif 168 169 ret = pthread_create(&childid, &attr, func, ctx); 170 if (ret != 0) 171 err(EXIT_FAILURE, "pthread_create failed"); 172 173 return childid; 174 } 175 176 static void reap_worker(pthread_t id) 177 { 178 int proc_status; 179 void *thread_status; 180 181 if (!thread_mode) { 182 /* process mode */ 183 wait(&proc_status); 184 if (!WIFEXITED(proc_status)) 185 exit(1); 186 } else { 187 pthread_join(id, &thread_status); 188 } 189 } 190 191 /* One group of senders and receivers */ 192 static unsigned int group(pthread_t *pth, 193 unsigned int num_fds, 194 int ready_out, 195 int wakefd) 196 { 197 unsigned int i; 198 struct sender_context *snd_ctx = malloc(sizeof(struct sender_context) 199 + num_fds * sizeof(int)); 200 201 if (!snd_ctx) 202 err(EXIT_FAILURE, "malloc()"); 203 204 for (i = 0; i < num_fds; i++) { 205 int fds[2]; 206 struct receiver_context *ctx = malloc(sizeof(*ctx)); 207 208 if (!ctx) 209 err(EXIT_FAILURE, "malloc()"); 210 211 212 /* Create the pipe between client and server */ 213 fdpair(fds); 214 215 ctx->num_packets = num_fds * nr_loops; 216 ctx->in_fds[0] = fds[0]; 217 ctx->in_fds[1] = fds[1]; 218 ctx->ready_out = ready_out; 219 ctx->wakefd = wakefd; 220 221 pth[i] = create_worker(ctx, (void *)receiver); 222 223 snd_ctx->out_fds[i] = fds[1]; 224 if (!thread_mode) 225 close(fds[0]); 226 } 227 228 /* Now we have all the fds, fork the senders */ 229 for (i = 0; i < num_fds; i++) { 230 snd_ctx->ready_out = ready_out; 231 snd_ctx->wakefd = wakefd; 232 snd_ctx->num_fds = num_fds; 233 234 pth[num_fds+i] = create_worker(snd_ctx, (void *)sender); 235 } 236 237 /* Close the fds we have left */ 238 if (!thread_mode) 239 for (i = 0; i < num_fds; i++) 240 close(snd_ctx->out_fds[i]); 241 242 /* Return number of children to reap */ 243 return num_fds * 2; 244 } 245 246 static const struct option options[] = { 247 OPT_BOOLEAN('p', "pipe", &use_pipes, 248 "Use pipe() instead of socketpair()"), 249 OPT_BOOLEAN('t', "thread", &thread_mode, 250 "Be multi thread instead of multi process"), 251 OPT_UINTEGER('g', "group", &num_groups, "Specify number of groups"), 252 OPT_UINTEGER('l', "nr_loops", &nr_loops, "Specify the number of loops to run (default: 100)"), 253 OPT_END() 254 }; 255 256 static const char * const bench_sched_message_usage[] = { 257 "perf bench sched messaging <options>", 258 NULL 259 }; 260 261 int bench_sched_messaging(int argc, const char **argv) 262 { 263 unsigned int i, total_children; 264 struct timeval start, stop, diff; 265 unsigned int num_fds = 20; 266 int readyfds[2], wakefds[2]; 267 char dummy; 268 pthread_t *pth_tab; 269 270 argc = parse_options(argc, argv, options, 271 bench_sched_message_usage, 0); 272 273 pth_tab = malloc(num_fds * 2 * num_groups * sizeof(pthread_t)); 274 if (!pth_tab) 275 err(EXIT_FAILURE, "main:malloc()"); 276 277 fdpair(readyfds); 278 fdpair(wakefds); 279 280 total_children = 0; 281 for (i = 0; i < num_groups; i++) 282 total_children += group(pth_tab+total_children, num_fds, 283 readyfds[1], wakefds[0]); 284 285 /* Wait for everyone to be ready */ 286 for (i = 0; i < total_children; i++) 287 if (read(readyfds[0], &dummy, 1) != 1) 288 err(EXIT_FAILURE, "Reading for readyfds"); 289 290 gettimeofday(&start, NULL); 291 292 /* Kick them off */ 293 if (write(wakefds[1], &dummy, 1) != 1) 294 err(EXIT_FAILURE, "Writing to start them"); 295 296 /* Reap them all */ 297 for (i = 0; i < total_children; i++) 298 reap_worker(pth_tab[i]); 299 300 gettimeofday(&stop, NULL); 301 302 timersub(&stop, &start, &diff); 303 304 switch (bench_format) { 305 case BENCH_FORMAT_DEFAULT: 306 printf("# %d sender and receiver %s per group\n", 307 num_fds, thread_mode ? "threads" : "processes"); 308 printf("# %d groups == %d %s run\n\n", 309 num_groups, num_groups * 2 * num_fds, 310 thread_mode ? "threads" : "processes"); 311 printf(" %14s: %lu.%03lu [sec]\n", "Total time", 312 diff.tv_sec, 313 (unsigned long) (diff.tv_usec / USEC_PER_MSEC)); 314 break; 315 case BENCH_FORMAT_SIMPLE: 316 printf("%lu.%03lu\n", diff.tv_sec, 317 (unsigned long) (diff.tv_usec / USEC_PER_MSEC)); 318 break; 319 default: 320 /* reaching here is something disaster */ 321 fprintf(stderr, "Unknown format:%d\n", bench_format); 322 exit(1); 323 break; 324 } 325 326 free(pth_tab); 327 328 return 0; 329 } 330