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 "../perf.h" 14 #include "../util/util.h" 15 #include <subcmd/parse-options.h> 16 #include "../builtin.h" 17 #include "bench.h" 18 19 /* Test groups of 20 processes spraying to 20 receivers */ 20 #include <pthread.h> 21 #include <stdio.h> 22 #include <stdlib.h> 23 #include <string.h> 24 #include <errno.h> 25 #include <unistd.h> 26 #include <sys/types.h> 27 #include <sys/socket.h> 28 #include <sys/wait.h> 29 #include <sys/time.h> 30 #include <poll.h> 31 #include <limits.h> 32 #include <err.h> 33 #include <linux/time64.h> 34 35 #define DATASIZE 100 36 37 static bool use_pipes = false; 38 static unsigned int nr_loops = 100; 39 static bool thread_mode = false; 40 static unsigned int num_groups = 10; 41 42 struct sender_context { 43 unsigned int num_fds; 44 int ready_out; 45 int wakefd; 46 int out_fds[0]; 47 }; 48 49 struct receiver_context { 50 unsigned int num_packets; 51 int in_fds[2]; 52 int ready_out; 53 int wakefd; 54 }; 55 56 static void fdpair(int fds[2]) 57 { 58 if (use_pipes) { 59 if (pipe(fds) == 0) 60 return; 61 } else { 62 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0) 63 return; 64 } 65 66 err(EXIT_FAILURE, use_pipes ? "pipe()" : "socketpair()"); 67 } 68 69 /* Block until we're ready to go */ 70 static void ready(int ready_out, int wakefd) 71 { 72 char dummy; 73 struct pollfd pollfd = { .fd = wakefd, .events = POLLIN }; 74 75 /* Tell them we're ready. */ 76 if (write(ready_out, &dummy, 1) != 1) 77 err(EXIT_FAILURE, "CLIENT: ready write"); 78 79 /* Wait for "GO" signal */ 80 if (poll(&pollfd, 1, -1) != 1) 81 err(EXIT_FAILURE, "poll"); 82 } 83 84 /* Sender sprays nr_loops messages down each file descriptor */ 85 static void *sender(struct sender_context *ctx) 86 { 87 char data[DATASIZE]; 88 unsigned int i, j; 89 90 ready(ctx->ready_out, ctx->wakefd); 91 92 /* Now pump to every receiver. */ 93 for (i = 0; i < nr_loops; i++) { 94 for (j = 0; j < ctx->num_fds; j++) { 95 int ret, done = 0; 96 97 again: 98 ret = write(ctx->out_fds[j], data + done, 99 sizeof(data)-done); 100 if (ret < 0) 101 err(EXIT_FAILURE, "SENDER: write"); 102 done += ret; 103 if (done < DATASIZE) 104 goto again; 105 } 106 } 107 108 return NULL; 109 } 110 111 112 /* One receiver per fd */ 113 static void *receiver(struct receiver_context* ctx) 114 { 115 unsigned int i; 116 117 if (!thread_mode) 118 close(ctx->in_fds[1]); 119 120 /* Wait for start... */ 121 ready(ctx->ready_out, ctx->wakefd); 122 123 /* Receive them all */ 124 for (i = 0; i < ctx->num_packets; i++) { 125 char data[DATASIZE]; 126 int ret, done = 0; 127 128 again: 129 ret = read(ctx->in_fds[0], data + done, DATASIZE - done); 130 if (ret < 0) 131 err(EXIT_FAILURE, "SERVER: read"); 132 done += ret; 133 if (done < DATASIZE) 134 goto again; 135 } 136 137 return NULL; 138 } 139 140 static pthread_t create_worker(void *ctx, void *(*func)(void *)) 141 { 142 pthread_attr_t attr; 143 pthread_t childid; 144 int ret; 145 146 if (!thread_mode) { 147 /* process mode */ 148 /* Fork the receiver. */ 149 switch (fork()) { 150 case -1: 151 err(EXIT_FAILURE, "fork()"); 152 break; 153 case 0: 154 (*func) (ctx); 155 exit(0); 156 break; 157 default: 158 break; 159 } 160 161 return (pthread_t)0; 162 } 163 164 if (pthread_attr_init(&attr) != 0) 165 err(EXIT_FAILURE, "pthread_attr_init:"); 166 167 #ifndef __ia64__ 168 if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0) 169 err(EXIT_FAILURE, "pthread_attr_setstacksize"); 170 #endif 171 172 ret = pthread_create(&childid, &attr, func, ctx); 173 if (ret != 0) 174 err(EXIT_FAILURE, "pthread_create failed"); 175 176 return childid; 177 } 178 179 static void reap_worker(pthread_t id) 180 { 181 int proc_status; 182 void *thread_status; 183 184 if (!thread_mode) { 185 /* process mode */ 186 wait(&proc_status); 187 if (!WIFEXITED(proc_status)) 188 exit(1); 189 } else { 190 pthread_join(id, &thread_status); 191 } 192 } 193 194 /* One group of senders and receivers */ 195 static unsigned int group(pthread_t *pth, 196 unsigned int num_fds, 197 int ready_out, 198 int wakefd) 199 { 200 unsigned int i; 201 struct sender_context *snd_ctx = malloc(sizeof(struct sender_context) 202 + num_fds * sizeof(int)); 203 204 if (!snd_ctx) 205 err(EXIT_FAILURE, "malloc()"); 206 207 for (i = 0; i < num_fds; i++) { 208 int fds[2]; 209 struct receiver_context *ctx = malloc(sizeof(*ctx)); 210 211 if (!ctx) 212 err(EXIT_FAILURE, "malloc()"); 213 214 215 /* Create the pipe between client and server */ 216 fdpair(fds); 217 218 ctx->num_packets = num_fds * nr_loops; 219 ctx->in_fds[0] = fds[0]; 220 ctx->in_fds[1] = fds[1]; 221 ctx->ready_out = ready_out; 222 ctx->wakefd = wakefd; 223 224 pth[i] = create_worker(ctx, (void *)receiver); 225 226 snd_ctx->out_fds[i] = fds[1]; 227 if (!thread_mode) 228 close(fds[0]); 229 } 230 231 /* Now we have all the fds, fork the senders */ 232 for (i = 0; i < num_fds; i++) { 233 snd_ctx->ready_out = ready_out; 234 snd_ctx->wakefd = wakefd; 235 snd_ctx->num_fds = num_fds; 236 237 pth[num_fds+i] = create_worker(snd_ctx, (void *)sender); 238 } 239 240 /* Close the fds we have left */ 241 if (!thread_mode) 242 for (i = 0; i < num_fds; i++) 243 close(snd_ctx->out_fds[i]); 244 245 /* Return number of children to reap */ 246 return num_fds * 2; 247 } 248 249 static const struct option options[] = { 250 OPT_BOOLEAN('p', "pipe", &use_pipes, 251 "Use pipe() instead of socketpair()"), 252 OPT_BOOLEAN('t', "thread", &thread_mode, 253 "Be multi thread instead of multi process"), 254 OPT_UINTEGER('g', "group", &num_groups, "Specify number of groups"), 255 OPT_UINTEGER('l', "nr_loops", &nr_loops, "Specify the number of loops to run (default: 100)"), 256 OPT_END() 257 }; 258 259 static const char * const bench_sched_message_usage[] = { 260 "perf bench sched messaging <options>", 261 NULL 262 }; 263 264 int bench_sched_messaging(int argc, const char **argv) 265 { 266 unsigned int i, total_children; 267 struct timeval start, stop, diff; 268 unsigned int num_fds = 20; 269 int readyfds[2], wakefds[2]; 270 char dummy; 271 pthread_t *pth_tab; 272 273 argc = parse_options(argc, argv, options, 274 bench_sched_message_usage, 0); 275 276 pth_tab = malloc(num_fds * 2 * num_groups * sizeof(pthread_t)); 277 if (!pth_tab) 278 err(EXIT_FAILURE, "main:malloc()"); 279 280 fdpair(readyfds); 281 fdpair(wakefds); 282 283 total_children = 0; 284 for (i = 0; i < num_groups; i++) 285 total_children += group(pth_tab+total_children, num_fds, 286 readyfds[1], wakefds[0]); 287 288 /* Wait for everyone to be ready */ 289 for (i = 0; i < total_children; i++) 290 if (read(readyfds[0], &dummy, 1) != 1) 291 err(EXIT_FAILURE, "Reading for readyfds"); 292 293 gettimeofday(&start, NULL); 294 295 /* Kick them off */ 296 if (write(wakefds[1], &dummy, 1) != 1) 297 err(EXIT_FAILURE, "Writing to start them"); 298 299 /* Reap them all */ 300 for (i = 0; i < total_children; i++) 301 reap_worker(pth_tab[i]); 302 303 gettimeofday(&stop, NULL); 304 305 timersub(&stop, &start, &diff); 306 307 switch (bench_format) { 308 case BENCH_FORMAT_DEFAULT: 309 printf("# %d sender and receiver %s per group\n", 310 num_fds, thread_mode ? "threads" : "processes"); 311 printf("# %d groups == %d %s run\n\n", 312 num_groups, num_groups * 2 * num_fds, 313 thread_mode ? "threads" : "processes"); 314 printf(" %14s: %lu.%03lu [sec]\n", "Total time", 315 diff.tv_sec, 316 (unsigned long) (diff.tv_usec / USEC_PER_MSEC)); 317 break; 318 case BENCH_FORMAT_SIMPLE: 319 printf("%lu.%03lu\n", diff.tv_sec, 320 (unsigned long) (diff.tv_usec / USEC_PER_MSEC)); 321 break; 322 default: 323 /* reaching here is something disaster */ 324 fprintf(stderr, "Unknown format:%d\n", bench_format); 325 exit(1); 326 break; 327 } 328 329 free(pth_tab); 330 331 return 0; 332 } 333