test/sysperf/loop4.c

   1 /*
   2  * loop4.c
   3  *
   4  * Used to test syscall mpsafeness, with editing
   5  *
   6  * $DragonFly: src/test/sysperf/loop4.c,v 1.1 2008/05/09 15:49:42 dillon Exp $
   7  */
   8
   9 #include "blib.h"
  10 #include <fcntl.h>
  11
  12 #define INNER 100
  13
  14 void doloop(int count);
  15 void func_nop1(void);
  16 void func_nop2(void);
  17
  18 int
  19 main(int ac, char **av)
  20 {
  21     int i;
  22     int fd;
  23     int count;
  24     int nfork;
  25     pid_t pid;
  26
  27     if (ac > 1)
  28         nfork = strtoul(av[1], NULL, 0);
  29
  30     printf("SMP contention, dup() + close(), Run just one\n");
  31
  32     start_timing();
  33     count = 0;
  34     while (stop_timing(0, NULL) == 0) {
  35         doloop(1000);
  36         count += 1000;
  37     }
  38     printf("loop %d times\n", count);
  39
  40     start_timing();
  41     for (i = 1; i < nfork; ++i) {
  42             if (fork() == 0) {
  43                 doloop(count);
  44                 _exit(1);
  45             }
  46     }
  47     doloop(count);
  48     while (wait(NULL) > 0)
  49         ;
  50     stop_timing(count * INNER, "loop2/2xfork");
  51     return(0);
  52 }
  53
  54 void
  55 doloop(int count)
  56 {
  57     int i;
  58     int j;
  59     int fd = open("/usr/share/dict/words", O_RDONLY);
  60     register void (*func)(void) = func_nop1;
  61
  62     if (fd < 0)
  63         perror("open");
  64     for (i = count; i > 0; --i) {
  65         for (j = INNER; j > 0; --j) {
  66                 getuid();
  67         }
  68     }
  69     close(fd);
  70 }
  71
  72 void
  73 func_nop1(void)
  74 {
  75 }
  76
  77 void
  78 func_nop2(void)
  79 {
  80 }
  81