test/sysperf/loop900k.c

   1 /*
   2  * Infinite loop test with 900,000 processes
   3  *
   4  * Requires system w/ 128GB+ of ram, kern.maxproc=4000000 set in
   5  * /boot/loader.conf.  80 second stabilization time after last
   6  * process is forked.
   7  *
   8  * Also test tear-down by ^C'ing the test.
   9  */
  10 #include <sys/types.h>
  11 #include <sys/wait.h>
  12 #include <sys/mman.h>
  13 #include <sys/resource.h>
  14 #include <errno.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <string.h>
  19 #include <signal.h>
  20
  21 #define COUNT   900000
  22
  23 int
  24 main(int ac, char **av)
  25 {
  26         int status;
  27         int i;
  28         int j;
  29         int idno;
  30         char *path;
  31         char *id;
  32         char c;
  33
  34         if (ac == 1) {
  35                 for (i = 0; i < COUNT; i += 100) {
  36 #if 0
  37                         asprintf(&path, "cp %s /tmp/x%06d", av[0], i);
  38                         system(path);
  39                         free(path);
  40                         asprintf(&path, "/tmp/x%06d", i);
  41 #else
  42                         asprintf(&path, "%s", av[0]);
  43 #endif
  44                         asprintf(&id, "%d", i);
  45                         if (vfork() == 0) {
  46                                 execl(path, path, id, NULL);
  47                                 _exit(0);
  48                         }
  49                         if (i % 1000 == 0) {
  50                                 printf("running %d\r", i);
  51                                 fflush(stdout);
  52                         }
  53                         free(path);
  54                         free(id);
  55                 }
  56         } else {
  57                 idno = strtol(av[1], NULL, 0);
  58                 setpriority(PRIO_PROCESS, 0, 5);
  59                 for (j = 0; j < 100; ++j) {
  60                         if (j == 99 || fork() == 0) {
  61                                 int dummy = 0;
  62
  63                                 setpriority(PRIO_PROCESS, 0, 15);
  64                                 sleep(80);
  65
  66                                 while (1) {
  67                                         ;
  68                                 }
  69                                 _exit(0);
  70                         }
  71                 }
  72                 while (wait3(NULL, 0, NULL) >= 0 || errno == EINTR)
  73                         ;
  74                 _exit(0);
  75         }
  76         printf("running %d\n", i);
  77         for (;;) {
  78                 sleep(1);
  79         }
  80         return 0;
  81 }