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Linux/tools/perf/bench/sched-messaging.c

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  1 /*
  2  *
  3  * sched-messaging.c
  4  *
  5  * messaging: Benchmark for scheduler and IPC mechanisms
  6  *
  7  * Based on hackbench by Rusty Russell <rusty@rustcorp.com.au>
  8  * Ported to perf by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
  9  *
 10  */
 11 
 12 #include "../perf.h"
 13 #include "../util/util.h"
 14 #include <subcmd/parse-options.h>
 15 #include "../builtin.h"
 16 #include "bench.h"
 17 
 18 /* Test groups of 20 processes spraying to 20 receivers */
 19 #include <pthread.h>
 20 #include <stdio.h>
 21 #include <stdlib.h>
 22 #include <string.h>
 23 #include <errno.h>
 24 #include <unistd.h>
 25 #include <sys/types.h>
 26 #include <sys/socket.h>
 27 #include <sys/wait.h>
 28 #include <sys/time.h>
 29 #include <poll.h>
 30 #include <limits.h>
 31 #include <err.h>
 32 #include <linux/time64.h>
 33 
 34 #define DATASIZE 100
 35 
 36 static bool use_pipes = false;
 37 static unsigned int nr_loops = 100;
 38 static bool thread_mode = false;
 39 static unsigned int num_groups = 10;
 40 
 41 struct sender_context {
 42         unsigned int num_fds;
 43         int ready_out;
 44         int wakefd;
 45         int out_fds[0];
 46 };
 47 
 48 struct receiver_context {
 49         unsigned int num_packets;
 50         int in_fds[2];
 51         int ready_out;
 52         int wakefd;
 53 };
 54 
 55 static void fdpair(int fds[2])
 56 {
 57         if (use_pipes) {
 58                 if (pipe(fds) == 0)
 59                         return;
 60         } else {
 61                 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0)
 62                         return;
 63         }
 64 
 65         err(EXIT_FAILURE, use_pipes ? "pipe()" : "socketpair()");
 66 }
 67 
 68 /* Block until we're ready to go */
 69 static void ready(int ready_out, int wakefd)
 70 {
 71         char dummy;
 72         struct pollfd pollfd = { .fd = wakefd, .events = POLLIN };
 73 
 74         /* Tell them we're ready. */
 75         if (write(ready_out, &dummy, 1) != 1)
 76                 err(EXIT_FAILURE, "CLIENT: ready write");
 77 
 78         /* Wait for "GO" signal */
 79         if (poll(&pollfd, 1, -1) != 1)
 80                 err(EXIT_FAILURE, "poll");
 81 }
 82 
 83 /* Sender sprays nr_loops messages down each file descriptor */
 84 static void *sender(struct sender_context *ctx)
 85 {
 86         char data[DATASIZE];
 87         unsigned int i, j;
 88 
 89         ready(ctx->ready_out, ctx->wakefd);
 90 
 91         /* Now pump to every receiver. */
 92         for (i = 0; i < nr_loops; i++) {
 93                 for (j = 0; j < ctx->num_fds; j++) {
 94                         int ret, done = 0;
 95 
 96 again:
 97                         ret = write(ctx->out_fds[j], data + done,
 98                                     sizeof(data)-done);
 99                         if (ret < 0)
100                                 err(EXIT_FAILURE, "SENDER: write");
101                         done += ret;
102                         if (done < DATASIZE)
103                                 goto again;
104                 }
105         }
106 
107         return NULL;
108 }
109 
110 
111 /* One receiver per fd */
112 static void *receiver(struct receiver_context* ctx)
113 {
114         unsigned int i;
115 
116         if (!thread_mode)
117                 close(ctx->in_fds[1]);
118 
119         /* Wait for start... */
120         ready(ctx->ready_out, ctx->wakefd);
121 
122         /* Receive them all */
123         for (i = 0; i < ctx->num_packets; i++) {
124                 char data[DATASIZE];
125                 int ret, done = 0;
126 
127 again:
128                 ret = read(ctx->in_fds[0], data + done, DATASIZE - done);
129                 if (ret < 0)
130                         err(EXIT_FAILURE, "SERVER: read");
131                 done += ret;
132                 if (done < DATASIZE)
133                         goto again;
134         }
135 
136         return NULL;
137 }
138 
139 static pthread_t create_worker(void *ctx, void *(*func)(void *))
140 {
141         pthread_attr_t attr;
142         pthread_t childid;
143         int ret;
144 
145         if (!thread_mode) {
146                 /* process mode */
147                 /* Fork the receiver. */
148                 switch (fork()) {
149                 case -1:
150                         err(EXIT_FAILURE, "fork()");
151                         break;
152                 case 0:
153                         (*func) (ctx);
154                         exit(0);
155                         break;
156                 default:
157                         break;
158                 }
159 
160                 return (pthread_t)0;
161         }
162 
163         if (pthread_attr_init(&attr) != 0)
164                 err(EXIT_FAILURE, "pthread_attr_init:");
165 
166 #ifndef __ia64__
167         if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0)
168                 err(EXIT_FAILURE, "pthread_attr_setstacksize");
169 #endif
170 
171         ret = pthread_create(&childid, &attr, func, ctx);
172         if (ret != 0)
173                 err(EXIT_FAILURE, "pthread_create failed");
174 
175         return childid;
176 }
177 
178 static void reap_worker(pthread_t id)
179 {
180         int proc_status;
181         void *thread_status;
182 
183         if (!thread_mode) {
184                 /* process mode */
185                 wait(&proc_status);
186                 if (!WIFEXITED(proc_status))
187                         exit(1);
188         } else {
189                 pthread_join(id, &thread_status);
190         }
191 }
192 
193 /* One group of senders and receivers */
194 static unsigned int group(pthread_t *pth,
195                 unsigned int num_fds,
196                 int ready_out,
197                 int wakefd)
198 {
199         unsigned int i;
200         struct sender_context *snd_ctx = malloc(sizeof(struct sender_context)
201                         + num_fds * sizeof(int));
202 
203         if (!snd_ctx)
204                 err(EXIT_FAILURE, "malloc()");
205 
206         for (i = 0; i < num_fds; i++) {
207                 int fds[2];
208                 struct receiver_context *ctx = malloc(sizeof(*ctx));
209 
210                 if (!ctx)
211                         err(EXIT_FAILURE, "malloc()");
212 
213 
214                 /* Create the pipe between client and server */
215                 fdpair(fds);
216 
217                 ctx->num_packets = num_fds * nr_loops;
218                 ctx->in_fds[0] = fds[0];
219                 ctx->in_fds[1] = fds[1];
220                 ctx->ready_out = ready_out;
221                 ctx->wakefd = wakefd;
222 
223                 pth[i] = create_worker(ctx, (void *)receiver);
224 
225                 snd_ctx->out_fds[i] = fds[1];
226                 if (!thread_mode)
227                         close(fds[0]);
228         }
229 
230         /* Now we have all the fds, fork the senders */
231         for (i = 0; i < num_fds; i++) {
232                 snd_ctx->ready_out = ready_out;
233                 snd_ctx->wakefd = wakefd;
234                 snd_ctx->num_fds = num_fds;
235 
236                 pth[num_fds+i] = create_worker(snd_ctx, (void *)sender);
237         }
238 
239         /* Close the fds we have left */
240         if (!thread_mode)
241                 for (i = 0; i < num_fds; i++)
242                         close(snd_ctx->out_fds[i]);
243 
244         /* Return number of children to reap */
245         return num_fds * 2;
246 }
247 
248 static const struct option options[] = {
249         OPT_BOOLEAN('p', "pipe", &use_pipes,
250                     "Use pipe() instead of socketpair()"),
251         OPT_BOOLEAN('t', "thread", &thread_mode,
252                     "Be multi thread instead of multi process"),
253         OPT_UINTEGER('g', "group", &num_groups, "Specify number of groups"),
254         OPT_UINTEGER('l', "nr_loops", &nr_loops, "Specify the number of loops to run (default: 100)"),
255         OPT_END()
256 };
257 
258 static const char * const bench_sched_message_usage[] = {
259         "perf bench sched messaging <options>",
260         NULL
261 };
262 
263 int bench_sched_messaging(int argc, const char **argv,
264                     const char *prefix __maybe_unused)
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 

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