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TOMOYO Linux Cross Reference
Linux/tools/testing/selftests/mqueue/mq_perf_tests.c

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  1 /*
  2  * This application is Copyright 2012 Red Hat, Inc.
  3  *      Doug Ledford <dledford@redhat.com>
  4  *
  5  * mq_perf_tests is free software: you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License as published by
  7  * the Free Software Foundation, version 3.
  8  *
  9  * mq_perf_tests is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  * For the full text of the license, see <http://www.gnu.org/licenses/>.
 15  *
 16  * mq_perf_tests.c
 17  *   Tests various types of message queue workloads, concentrating on those
 18  *   situations that invole large message sizes, large message queue depths,
 19  *   or both, and reports back useful metrics about kernel message queue
 20  *   performance.
 21  *
 22  */
 23 #define _GNU_SOURCE
 24 #include <stdio.h>
 25 #include <stdlib.h>
 26 #include <unistd.h>
 27 #include <fcntl.h>
 28 #include <string.h>
 29 #include <limits.h>
 30 #include <errno.h>
 31 #include <signal.h>
 32 #include <pthread.h>
 33 #include <sched.h>
 34 #include <sys/types.h>
 35 #include <sys/time.h>
 36 #include <sys/resource.h>
 37 #include <sys/stat.h>
 38 #include <mqueue.h>
 39 #include <popt.h>
 40 #include <error.h>
 41 
 42 static char *usage =
 43 "Usage:\n"
 44 "  %s [-c #[,#..] -f] path\n"
 45 "\n"
 46 "       -c #    Skip most tests and go straight to a high queue depth test\n"
 47 "               and then run that test continuously (useful for running at\n"
 48 "               the same time as some other workload to see how much the\n"
 49 "               cache thrashing caused by adding messages to a very deep\n"
 50 "               queue impacts the performance of other programs).  The number\n"
 51 "               indicates which CPU core we should bind the process to during\n"
 52 "               the run.  If you have more than one physical CPU, then you\n"
 53 "               will need one copy per physical CPU package, and you should\n"
 54 "               specify the CPU cores to pin ourself to via a comma separated\n"
 55 "               list of CPU values.\n"
 56 "       -f      Only usable with continuous mode.  Pin ourself to the CPUs\n"
 57 "               as requested, then instead of looping doing a high mq\n"
 58 "               workload, just busy loop.  This will allow us to lock up a\n"
 59 "               single CPU just like we normally would, but without actually\n"
 60 "               thrashing the CPU cache.  This is to make it easier to get\n"
 61 "               comparable numbers from some other workload running on the\n"
 62 "               other CPUs.  One set of numbers with # CPUs locked up running\n"
 63 "               an mq workload, and another set of numbers with those same\n"
 64 "               CPUs locked away from the test workload, but not doing\n"
 65 "               anything to trash the cache like the mq workload might.\n"
 66 "       path    Path name of the message queue to create\n"
 67 "\n"
 68 "       Note: this program must be run as root in order to enable all tests\n"
 69 "\n";
 70 
 71 char *MAX_MSGS = "/proc/sys/fs/mqueue/msg_max";
 72 char *MAX_MSGSIZE = "/proc/sys/fs/mqueue/msgsize_max";
 73 
 74 #define min(a, b) ((a) < (b) ? (a) : (b))
 75 #define MAX_CPUS 64
 76 char *cpu_option_string;
 77 int cpus_to_pin[MAX_CPUS];
 78 int num_cpus_to_pin;
 79 pthread_t cpu_threads[MAX_CPUS];
 80 pthread_t main_thread;
 81 cpu_set_t *cpu_set;
 82 int cpu_set_size;
 83 int cpus_online;
 84 
 85 #define MSG_SIZE 16
 86 #define TEST1_LOOPS 10000000
 87 #define TEST2_LOOPS 100000
 88 int continuous_mode;
 89 int continuous_mode_fake;
 90 
 91 struct rlimit saved_limits, cur_limits;
 92 int saved_max_msgs, saved_max_msgsize;
 93 int cur_max_msgs, cur_max_msgsize;
 94 FILE *max_msgs, *max_msgsize;
 95 int cur_nice;
 96 char *queue_path = "/mq_perf_tests";
 97 mqd_t queue = -1;
 98 struct mq_attr result;
 99 int mq_prio_max;
100 
101 const struct poptOption options[] = {
102         {
103                 .longName = "continuous",
104                 .shortName = 'c',
105                 .argInfo = POPT_ARG_STRING,
106                 .arg = &cpu_option_string,
107                 .val = 'c',
108                 .descrip = "Run continuous tests at a high queue depth in "
109                         "order to test the effects of cache thrashing on "
110                         "other tasks on the system.  This test is intended "
111                         "to be run on one core of each physical CPU while "
112                         "some other CPU intensive task is run on all the other "
113                         "cores of that same physical CPU and the other task "
114                         "is timed.  It is assumed that the process of adding "
115                         "messages to the message queue in a tight loop will "
116                         "impact that other task to some degree.  Once the "
117                         "tests are performed in this way, you should then "
118                         "re-run the tests using fake mode in order to check "
119                         "the difference in time required to perform the CPU "
120                         "intensive task",
121                 .argDescrip = "cpu[,cpu]",
122         },
123         {
124                 .longName = "fake",
125                 .shortName = 'f',
126                 .argInfo = POPT_ARG_NONE,
127                 .arg = &continuous_mode_fake,
128                 .val = 0,
129                 .descrip = "Tie up the CPUs that we would normally tie up in"
130                         "continuous mode, but don't actually do any mq stuff, "
131                         "just keep the CPU busy so it can't be used to process "
132                         "system level tasks as this would free up resources on "
133                         "the other CPU cores and skew the comparison between "
134                         "the no-mqueue work and mqueue work tests",
135                 .argDescrip = NULL,
136         },
137         {
138                 .longName = "path",
139                 .shortName = 'p',
140                 .argInfo = POPT_ARG_STRING | POPT_ARGFLAG_SHOW_DEFAULT,
141                 .arg = &queue_path,
142                 .val = 'p',
143                 .descrip = "The name of the path to use in the mqueue "
144                         "filesystem for our tests",
145                 .argDescrip = "pathname",
146         },
147         POPT_AUTOHELP
148         POPT_TABLEEND
149 };
150 
151 static inline void __set(FILE *stream, int value, char *err_msg);
152 void shutdown(int exit_val, char *err_cause, int line_no);
153 void sig_action_SIGUSR1(int signum, siginfo_t *info, void *context);
154 void sig_action(int signum, siginfo_t *info, void *context);
155 static inline int get(FILE *stream);
156 static inline void set(FILE *stream, int value);
157 static inline int try_set(FILE *stream, int value);
158 static inline void getr(int type, struct rlimit *rlim);
159 static inline void setr(int type, struct rlimit *rlim);
160 static inline void open_queue(struct mq_attr *attr);
161 void increase_limits(void);
162 
163 static inline void __set(FILE *stream, int value, char *err_msg)
164 {
165         rewind(stream);
166         if (fprintf(stream, "%d", value) < 0)
167                 perror(err_msg);
168 }
169 
170 
171 void shutdown(int exit_val, char *err_cause, int line_no)
172 {
173         static int in_shutdown = 0;
174         int errno_at_shutdown = errno;
175         int i;
176 
177         /* In case we get called by multiple threads or from an sighandler */
178         if (in_shutdown++)
179                 return;
180 
181         for (i = 0; i < num_cpus_to_pin; i++)
182                 if (cpu_threads[i]) {
183                         pthread_kill(cpu_threads[i], SIGUSR1);
184                         pthread_join(cpu_threads[i], NULL);
185                 }
186 
187         if (queue != -1)
188                 if (mq_close(queue))
189                         perror("mq_close() during shutdown");
190         if (queue_path)
191                 /*
192                  * Be silent if this fails, if we cleaned up already it's
193                  * expected to fail
194                  */
195                 mq_unlink(queue_path);
196         if (saved_max_msgs)
197                 __set(max_msgs, saved_max_msgs,
198                       "failed to restore saved_max_msgs");
199         if (saved_max_msgsize)
200                 __set(max_msgsize, saved_max_msgsize,
201                       "failed to restore saved_max_msgsize");
202         if (exit_val)
203                 error(exit_val, errno_at_shutdown, "%s at %d",
204                       err_cause, line_no);
205         exit(0);
206 }
207 
208 void sig_action_SIGUSR1(int signum, siginfo_t *info, void *context)
209 {
210         if (pthread_self() != main_thread)
211                 pthread_exit(0);
212         else {
213                 fprintf(stderr, "Caught signal %d in SIGUSR1 handler, "
214                                 "exiting\n", signum);
215                 shutdown(0, "", 0);
216                 fprintf(stderr, "\n\nReturned from shutdown?!?!\n\n");
217                 exit(0);
218         }
219 }
220 
221 void sig_action(int signum, siginfo_t *info, void *context)
222 {
223         if (pthread_self() != main_thread)
224                 pthread_kill(main_thread, signum);
225         else {
226                 fprintf(stderr, "Caught signal %d, exiting\n", signum);
227                 shutdown(0, "", 0);
228                 fprintf(stderr, "\n\nReturned from shutdown?!?!\n\n");
229                 exit(0);
230         }
231 }
232 
233 static inline int get(FILE *stream)
234 {
235         int value;
236         rewind(stream);
237         if (fscanf(stream, "%d", &value) != 1)
238                 shutdown(4, "Error reading /proc entry", __LINE__);
239         return value;
240 }
241 
242 static inline void set(FILE *stream, int value)
243 {
244         int new_value;
245 
246         rewind(stream);
247         if (fprintf(stream, "%d", value) < 0)
248                 return shutdown(5, "Failed writing to /proc file", __LINE__);
249         new_value = get(stream);
250         if (new_value != value)
251                 return shutdown(5, "We didn't get what we wrote to /proc back",
252                                 __LINE__);
253 }
254 
255 static inline int try_set(FILE *stream, int value)
256 {
257         int new_value;
258 
259         rewind(stream);
260         fprintf(stream, "%d", value);
261         new_value = get(stream);
262         return new_value == value;
263 }
264 
265 static inline void getr(int type, struct rlimit *rlim)
266 {
267         if (getrlimit(type, rlim))
268                 shutdown(6, "getrlimit()", __LINE__);
269 }
270 
271 static inline void setr(int type, struct rlimit *rlim)
272 {
273         if (setrlimit(type, rlim))
274                 shutdown(7, "setrlimit()", __LINE__);
275 }
276 
277 /**
278  * open_queue - open the global queue for testing
279  * @attr - An attr struct specifying the desired queue traits
280  * @result - An attr struct that lists the actual traits the queue has
281  *
282  * This open is not allowed to fail, failure will result in an orderly
283  * shutdown of the program.  The global queue_path is used to set what
284  * queue to open, the queue descriptor is saved in the global queue
285  * variable.
286  */
287 static inline void open_queue(struct mq_attr *attr)
288 {
289         int flags = O_RDWR | O_EXCL | O_CREAT | O_NONBLOCK;
290         int perms = DEFFILEMODE;
291 
292         queue = mq_open(queue_path, flags, perms, attr);
293         if (queue == -1)
294                 shutdown(1, "mq_open()", __LINE__);
295         if (mq_getattr(queue, &result))
296                 shutdown(1, "mq_getattr()", __LINE__);
297         printf("\n\tQueue %s created:\n", queue_path);
298         printf("\t\tmq_flags:\t\t\t%s\n", result.mq_flags & O_NONBLOCK ?
299                "O_NONBLOCK" : "(null)");
300         printf("\t\tmq_maxmsg:\t\t\t%lu\n", result.mq_maxmsg);
301         printf("\t\tmq_msgsize:\t\t\t%lu\n", result.mq_msgsize);
302         printf("\t\tmq_curmsgs:\t\t\t%lu\n", result.mq_curmsgs);
303 }
304 
305 void *fake_cont_thread(void *arg)
306 {
307         int i;
308 
309         for (i = 0; i < num_cpus_to_pin; i++)
310                 if (cpu_threads[i] == pthread_self())
311                         break;
312         printf("\tStarted fake continuous mode thread %d on CPU %d\n", i,
313                cpus_to_pin[i]);
314         while (1)
315                 ;
316 }
317 
318 void *cont_thread(void *arg)
319 {
320         char buff[MSG_SIZE];
321         int i, priority;
322 
323         for (i = 0; i < num_cpus_to_pin; i++)
324                 if (cpu_threads[i] == pthread_self())
325                         break;
326         printf("\tStarted continuous mode thread %d on CPU %d\n", i,
327                cpus_to_pin[i]);
328         while (1) {
329                 while (mq_send(queue, buff, sizeof(buff), 0) == 0)
330                         ;
331                 mq_receive(queue, buff, sizeof(buff), &priority);
332         }
333 }
334 
335 #define drain_queue() \
336         while (mq_receive(queue, buff, MSG_SIZE, &prio_in) == MSG_SIZE)
337 
338 #define do_untimed_send() \
339         do { \
340                 if (mq_send(queue, buff, MSG_SIZE, prio_out)) \
341                         shutdown(3, "Test send failure", __LINE__); \
342         } while (0)
343 
344 #define do_send_recv() \
345         do { \
346                 clock_gettime(clock, &start); \
347                 if (mq_send(queue, buff, MSG_SIZE, prio_out)) \
348                         shutdown(3, "Test send failure", __LINE__); \
349                 clock_gettime(clock, &middle); \
350                 if (mq_receive(queue, buff, MSG_SIZE, &prio_in) != MSG_SIZE) \
351                         shutdown(3, "Test receive failure", __LINE__); \
352                 clock_gettime(clock, &end); \
353                 nsec = ((middle.tv_sec - start.tv_sec) * 1000000000) + \
354                         (middle.tv_nsec - start.tv_nsec); \
355                 send_total.tv_nsec += nsec; \
356                 if (send_total.tv_nsec >= 1000000000) { \
357                         send_total.tv_sec++; \
358                         send_total.tv_nsec -= 1000000000; \
359                 } \
360                 nsec = ((end.tv_sec - middle.tv_sec) * 1000000000) + \
361                         (end.tv_nsec - middle.tv_nsec); \
362                 recv_total.tv_nsec += nsec; \
363                 if (recv_total.tv_nsec >= 1000000000) { \
364                         recv_total.tv_sec++; \
365                         recv_total.tv_nsec -= 1000000000; \
366                 } \
367         } while (0)
368 
369 struct test {
370         char *desc;
371         void (*func)(int *);
372 };
373 
374 void const_prio(int *prio)
375 {
376         return;
377 }
378 
379 void inc_prio(int *prio)
380 {
381         if (++*prio == mq_prio_max)
382                 *prio = 0;
383 }
384 
385 void dec_prio(int *prio)
386 {
387         if (--*prio < 0)
388                 *prio = mq_prio_max - 1;
389 }
390 
391 void random_prio(int *prio)
392 {
393         *prio = random() % mq_prio_max;
394 }
395 
396 struct test test2[] = {
397         {"\n\tTest #2a: Time send/recv message, queue full, constant prio\n",
398                 const_prio},
399         {"\n\tTest #2b: Time send/recv message, queue full, increasing prio\n",
400                 inc_prio},
401         {"\n\tTest #2c: Time send/recv message, queue full, decreasing prio\n",
402                 dec_prio},
403         {"\n\tTest #2d: Time send/recv message, queue full, random prio\n",
404                 random_prio},
405         {NULL, NULL}
406 };
407 
408 /**
409  * Tests to perform (all done with MSG_SIZE messages):
410  *
411  * 1) Time to add/remove message with 0 messages on queue
412  * 1a) with constant prio
413  * 2) Time to add/remove message when queue close to capacity:
414  * 2a) with constant prio
415  * 2b) with increasing prio
416  * 2c) with decreasing prio
417  * 2d) with random prio
418  * 3) Test limits of priorities honored (double check _SC_MQ_PRIO_MAX)
419  */
420 void *perf_test_thread(void *arg)
421 {
422         char buff[MSG_SIZE];
423         int prio_out, prio_in;
424         int i;
425         clockid_t clock;
426         pthread_t *t;
427         struct timespec res, start, middle, end, send_total, recv_total;
428         unsigned long long nsec;
429         struct test *cur_test;
430 
431         t = &cpu_threads[0];
432         printf("\n\tStarted mqueue performance test thread on CPU %d\n",
433                cpus_to_pin[0]);
434         mq_prio_max = sysconf(_SC_MQ_PRIO_MAX);
435         if (mq_prio_max == -1)
436                 shutdown(2, "sysconf(_SC_MQ_PRIO_MAX)", __LINE__);
437         if (pthread_getcpuclockid(cpu_threads[0], &clock) != 0)
438                 shutdown(2, "pthread_getcpuclockid", __LINE__);
439 
440         if (clock_getres(clock, &res))
441                 shutdown(2, "clock_getres()", __LINE__);
442 
443         printf("\t\tMax priorities:\t\t\t%d\n", mq_prio_max);
444         printf("\t\tClock resolution:\t\t%lu nsec%s\n", res.tv_nsec,
445                res.tv_nsec > 1 ? "s" : "");
446 
447 
448 
449         printf("\n\tTest #1: Time send/recv message, queue empty\n");
450         printf("\t\t(%d iterations)\n", TEST1_LOOPS);
451         prio_out = 0;
452         send_total.tv_sec = 0;
453         send_total.tv_nsec = 0;
454         recv_total.tv_sec = 0;
455         recv_total.tv_nsec = 0;
456         for (i = 0; i < TEST1_LOOPS; i++)
457                 do_send_recv();
458         printf("\t\tSend msg:\t\t\t%ld.%lus total time\n",
459                send_total.tv_sec, send_total.tv_nsec);
460         nsec = ((unsigned long long)send_total.tv_sec * 1000000000 +
461                  send_total.tv_nsec) / TEST1_LOOPS;
462         printf("\t\t\t\t\t\t%lld nsec/msg\n", nsec);
463         printf("\t\tRecv msg:\t\t\t%ld.%lus total time\n",
464                recv_total.tv_sec, recv_total.tv_nsec);
465         nsec = ((unsigned long long)recv_total.tv_sec * 1000000000 +
466                 recv_total.tv_nsec) / TEST1_LOOPS;
467         printf("\t\t\t\t\t\t%lld nsec/msg\n", nsec);
468 
469 
470         for (cur_test = test2; cur_test->desc != NULL; cur_test++) {
471                 printf("%s:\n", cur_test->desc);
472                 printf("\t\t(%d iterations)\n", TEST2_LOOPS);
473                 prio_out = 0;
474                 send_total.tv_sec = 0;
475                 send_total.tv_nsec = 0;
476                 recv_total.tv_sec = 0;
477                 recv_total.tv_nsec = 0;
478                 printf("\t\tFilling queue...");
479                 fflush(stdout);
480                 clock_gettime(clock, &start);
481                 for (i = 0; i < result.mq_maxmsg - 1; i++) {
482                         do_untimed_send();
483                         cur_test->func(&prio_out);
484                 }
485                 clock_gettime(clock, &end);
486                 nsec = ((unsigned long long)(end.tv_sec - start.tv_sec) *
487                         1000000000) + (end.tv_nsec - start.tv_nsec);
488                 printf("done.\t\t%lld.%llds\n", nsec / 1000000000,
489                        nsec % 1000000000);
490                 printf("\t\tTesting...");
491                 fflush(stdout);
492                 for (i = 0; i < TEST2_LOOPS; i++) {
493                         do_send_recv();
494                         cur_test->func(&prio_out);
495                 }
496                 printf("done.\n");
497                 printf("\t\tSend msg:\t\t\t%ld.%lus total time\n",
498                        send_total.tv_sec, send_total.tv_nsec);
499                 nsec = ((unsigned long long)send_total.tv_sec * 1000000000 +
500                          send_total.tv_nsec) / TEST2_LOOPS;
501                 printf("\t\t\t\t\t\t%lld nsec/msg\n", nsec);
502                 printf("\t\tRecv msg:\t\t\t%ld.%lus total time\n",
503                        recv_total.tv_sec, recv_total.tv_nsec);
504                 nsec = ((unsigned long long)recv_total.tv_sec * 1000000000 +
505                         recv_total.tv_nsec) / TEST2_LOOPS;
506                 printf("\t\t\t\t\t\t%lld nsec/msg\n", nsec);
507                 printf("\t\tDraining queue...");
508                 fflush(stdout);
509                 clock_gettime(clock, &start);
510                 drain_queue();
511                 clock_gettime(clock, &end);
512                 nsec = ((unsigned long long)(end.tv_sec - start.tv_sec) *
513                         1000000000) + (end.tv_nsec - start.tv_nsec);
514                 printf("done.\t\t%lld.%llds\n", nsec / 1000000000,
515                        nsec % 1000000000);
516         }
517         return 0;
518 }
519 
520 void increase_limits(void)
521 {
522         cur_limits.rlim_cur = RLIM_INFINITY;
523         cur_limits.rlim_max = RLIM_INFINITY;
524         setr(RLIMIT_MSGQUEUE, &cur_limits);
525         while (try_set(max_msgs, cur_max_msgs += 10))
526                 ;
527         cur_max_msgs = get(max_msgs);
528         while (try_set(max_msgsize, cur_max_msgsize += 1024))
529                 ;
530         cur_max_msgsize = get(max_msgsize);
531         if (setpriority(PRIO_PROCESS, 0, -20) != 0)
532                 shutdown(2, "setpriority()", __LINE__);
533         cur_nice = -20;
534 }
535 
536 int main(int argc, char *argv[])
537 {
538         struct mq_attr attr;
539         char *option, *next_option;
540         int i, cpu, rc;
541         struct sigaction sa;
542         poptContext popt_context;
543         void *retval;
544 
545         main_thread = pthread_self();
546         num_cpus_to_pin = 0;
547 
548         if (sysconf(_SC_NPROCESSORS_ONLN) == -1) {
549                 perror("sysconf(_SC_NPROCESSORS_ONLN)");
550                 exit(1);
551         }
552         cpus_online = min(MAX_CPUS, sysconf(_SC_NPROCESSORS_ONLN));
553         cpu_set = CPU_ALLOC(cpus_online);
554         if (cpu_set == NULL) {
555                 perror("CPU_ALLOC()");
556                 exit(1);
557         }
558         cpu_set_size = CPU_ALLOC_SIZE(cpus_online);
559         CPU_ZERO_S(cpu_set_size, cpu_set);
560 
561         popt_context = poptGetContext(NULL, argc, (const char **)argv,
562                                       options, 0);
563 
564         while ((rc = poptGetNextOpt(popt_context)) > 0) {
565                 switch (rc) {
566                 case 'c':
567                         continuous_mode = 1;
568                         option = cpu_option_string;
569                         do {
570                                 next_option = strchr(option, ',');
571                                 if (next_option)
572                                         *next_option = '\0';
573                                 cpu = atoi(option);
574                                 if (cpu >= cpus_online)
575                                         fprintf(stderr, "CPU %d exceeds "
576                                                 "cpus online, ignoring.\n",
577                                                 cpu);
578                                 else
579                                         cpus_to_pin[num_cpus_to_pin++] = cpu;
580                                 if (next_option)
581                                         option = ++next_option;
582                         } while (next_option && num_cpus_to_pin < MAX_CPUS);
583                         /* Double check that they didn't give us the same CPU
584                          * more than once */
585                         for (cpu = 0; cpu < num_cpus_to_pin; cpu++) {
586                                 if (CPU_ISSET_S(cpus_to_pin[cpu], cpu_set_size,
587                                                 cpu_set)) {
588                                         fprintf(stderr, "Any given CPU may "
589                                                 "only be given once.\n");
590                                         exit(1);
591                                 } else
592                                         CPU_SET_S(cpus_to_pin[cpu],
593                                                   cpu_set_size, cpu_set);
594                         }
595                         break;
596                 case 'p':
597                         /*
598                          * Although we can create a msg queue with a
599                          * non-absolute path name, unlink will fail.  So,
600                          * if the name doesn't start with a /, add one
601                          * when we save it.
602                          */
603                         option = queue_path;
604                         if (*option != '/') {
605                                 queue_path = malloc(strlen(option) + 2);
606                                 if (!queue_path) {
607                                         perror("malloc()");
608                                         exit(1);
609                                 }
610                                 queue_path[0] = '/';
611                                 queue_path[1] = 0;
612                                 strcat(queue_path, option);
613                                 free(option);
614                         }
615                         break;
616                 }
617         }
618 
619         if (continuous_mode && num_cpus_to_pin == 0) {
620                 fprintf(stderr, "Must pass at least one CPU to continuous "
621                         "mode.\n");
622                 poptPrintUsage(popt_context, stderr, 0);
623                 exit(1);
624         } else if (!continuous_mode) {
625                 num_cpus_to_pin = 1;
626                 cpus_to_pin[0] = cpus_online - 1;
627         }
628 
629         if (getuid() != 0) {
630                 fprintf(stderr, "Not running as root, but almost all tests "
631                         "require root in order to modify\nsystem settings.  "
632                         "Exiting.\n");
633                 exit(1);
634         }
635 
636         max_msgs = fopen(MAX_MSGS, "r+");
637         max_msgsize = fopen(MAX_MSGSIZE, "r+");
638         if (!max_msgs)
639                 shutdown(2, "Failed to open msg_max", __LINE__);
640         if (!max_msgsize)
641                 shutdown(2, "Failed to open msgsize_max", __LINE__);
642 
643         /* Load up the current system values for everything we can */
644         getr(RLIMIT_MSGQUEUE, &saved_limits);
645         cur_limits = saved_limits;
646         saved_max_msgs = cur_max_msgs = get(max_msgs);
647         saved_max_msgsize = cur_max_msgsize = get(max_msgsize);
648         errno = 0;
649         cur_nice = getpriority(PRIO_PROCESS, 0);
650         if (errno)
651                 shutdown(2, "getpriority()", __LINE__);
652 
653         /* Tell the user our initial state */
654         printf("\nInitial system state:\n");
655         printf("\tUsing queue path:\t\t\t%s\n", queue_path);
656         printf("\tRLIMIT_MSGQUEUE(soft):\t\t\t%ld\n",
657                 (long) saved_limits.rlim_cur);
658         printf("\tRLIMIT_MSGQUEUE(hard):\t\t\t%ld\n",
659                 (long) saved_limits.rlim_max);
660         printf("\tMaximum Message Size:\t\t\t%d\n", saved_max_msgsize);
661         printf("\tMaximum Queue Size:\t\t\t%d\n", saved_max_msgs);
662         printf("\tNice value:\t\t\t\t%d\n", cur_nice);
663         printf("\n");
664 
665         increase_limits();
666 
667         printf("Adjusted system state for testing:\n");
668         if (cur_limits.rlim_cur == RLIM_INFINITY) {
669                 printf("\tRLIMIT_MSGQUEUE(soft):\t\t\t(unlimited)\n");
670                 printf("\tRLIMIT_MSGQUEUE(hard):\t\t\t(unlimited)\n");
671         } else {
672                 printf("\tRLIMIT_MSGQUEUE(soft):\t\t\t%ld\n",
673                        (long) cur_limits.rlim_cur);
674                 printf("\tRLIMIT_MSGQUEUE(hard):\t\t\t%ld\n",
675                        (long) cur_limits.rlim_max);
676         }
677         printf("\tMaximum Message Size:\t\t\t%d\n", cur_max_msgsize);
678         printf("\tMaximum Queue Size:\t\t\t%d\n", cur_max_msgs);
679         printf("\tNice value:\t\t\t\t%d\n", cur_nice);
680         printf("\tContinuous mode:\t\t\t(%s)\n", continuous_mode ?
681                (continuous_mode_fake ? "fake mode" : "enabled") :
682                "disabled");
683         printf("\tCPUs to pin:\t\t\t\t%d", cpus_to_pin[0]);
684         for (cpu = 1; cpu < num_cpus_to_pin; cpu++)
685                         printf(",%d", cpus_to_pin[cpu]);
686         printf("\n");
687 
688         sa.sa_sigaction = sig_action_SIGUSR1;
689         sigemptyset(&sa.sa_mask);
690         sigaddset(&sa.sa_mask, SIGHUP);
691         sigaddset(&sa.sa_mask, SIGINT);
692         sigaddset(&sa.sa_mask, SIGQUIT);
693         sigaddset(&sa.sa_mask, SIGTERM);
694         sa.sa_flags = SA_SIGINFO;
695         if (sigaction(SIGUSR1, &sa, NULL) == -1)
696                 shutdown(1, "sigaction(SIGUSR1)", __LINE__);
697         sa.sa_sigaction = sig_action;
698         if (sigaction(SIGHUP, &sa, NULL) == -1)
699                 shutdown(1, "sigaction(SIGHUP)", __LINE__);
700         if (sigaction(SIGINT, &sa, NULL) == -1)
701                 shutdown(1, "sigaction(SIGINT)", __LINE__);
702         if (sigaction(SIGQUIT, &sa, NULL) == -1)
703                 shutdown(1, "sigaction(SIGQUIT)", __LINE__);
704         if (sigaction(SIGTERM, &sa, NULL) == -1)
705                 shutdown(1, "sigaction(SIGTERM)", __LINE__);
706 
707         if (!continuous_mode_fake) {
708                 attr.mq_flags = O_NONBLOCK;
709                 attr.mq_maxmsg = cur_max_msgs;
710                 attr.mq_msgsize = MSG_SIZE;
711                 open_queue(&attr);
712         }
713         for (i = 0; i < num_cpus_to_pin; i++) {
714                 pthread_attr_t thread_attr;
715                 void *thread_func;
716 
717                 if (continuous_mode_fake)
718                         thread_func = &fake_cont_thread;
719                 else if (continuous_mode)
720                         thread_func = &cont_thread;
721                 else
722                         thread_func = &perf_test_thread;
723 
724                 CPU_ZERO_S(cpu_set_size, cpu_set);
725                 CPU_SET_S(cpus_to_pin[i], cpu_set_size, cpu_set);
726                 pthread_attr_init(&thread_attr);
727                 pthread_attr_setaffinity_np(&thread_attr, cpu_set_size,
728                                             cpu_set);
729                 if (pthread_create(&cpu_threads[i], &thread_attr, thread_func,
730                                    NULL))
731                         shutdown(1, "pthread_create()", __LINE__);
732                 pthread_attr_destroy(&thread_attr);
733         }
734 
735         if (!continuous_mode) {
736                 pthread_join(cpu_threads[0], &retval);
737                 shutdown((long)retval, "perf_test_thread()", __LINE__);
738         } else {
739                 while (1)
740                         sleep(1);
741         }
742         shutdown(0, "", 0);
743 }
744 

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