~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/tools/perf/bench/sched-messaging.c

Version: ~ [ linux-4.14 ] ~ [ linux-4.13.12 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.61 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.97 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.46 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.80 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.50 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.95 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.27.62 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp