tools/tests/darwintests/perf_spawn_fork.c

   1 #include <darwintest.h>
   2 #include <spawn.h>
   3 #include <stdlib.h>
   4 #include <unistd.h>
   5
   6
   7 #define SPAWN_MEASURE_LOOP(s) \
   8         char *args[] = {"/usr/bin/true", NULL}; \
   9         int err; \
  10         pid_t pid; \
  11         int status; \
  12         while (!dt_stat_stable(s)) { \
  13                 T_STAT_MEASURE(s) { \
  14                         err = posix_spawn(&pid, args[0], NULL, NULL, args, NULL); \
  15                 } \
  16                 if (err) { \
  17                         T_FAIL("posix_spawn returned %d", err); \
  18                 } \
  19                 waitpid(pid, &status, 0); \
  20                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { \
  21                         T_FAIL("Child process of posix_spawn failed to run"); \
  22                 } \
  23         }
  24
  25 T_DECL(posix_spawn_platform_binary_latency, "posix_spawn platform binary latency", T_META_TYPE_PERF, T_META_CHECK_LEAKS(NO)) {
  26         {
  27                 dt_stat_time_t s = dt_stat_time_create("time");
  28                 SPAWN_MEASURE_LOOP(s);
  29                 dt_stat_finalize(s);
  30         }
  31
  32         {
  33                 dt_stat_thread_cpu_time_t s = dt_stat_thread_cpu_time_create("on-cpu time");
  34                 SPAWN_MEASURE_LOOP(s);
  35                 dt_stat_finalize(s);
  36         }
  37 }
  38
  39 #define FORK_MEASURE_LOOP(s) \
  40         pid_t pid; \
  41         int status; \
  42         while (!dt_stat_stable(s)) { \
  43                 T_STAT_MEASURE(s) { \
  44                         pid = fork(); \
  45                         if (pid == 0) \
  46                                 exit(0); \
  47                         else if (pid == -1) \
  48                                 T_FAIL("fork returned -1"); \
  49                 } \
  50                 waitpid(pid, &status, 0); \
  51                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { \
  52                         T_FAIL("forked process failed to exit properly"); \
  53                 } \
  54         }
  55
  56 T_DECL(fork, "fork latency", T_META_TYPE_PERF, T_META_CHECK_LEAKS(NO)) {
  57         {
  58                 dt_stat_time_t s = dt_stat_time_create("time");
  59                 FORK_MEASURE_LOOP(s);
  60                 dt_stat_finalize(s);
  61         }
  62         {
  63                 dt_stat_thread_cpu_time_t s = dt_stat_thread_cpu_time_create("on-cpu time");
  64                 FORK_MEASURE_LOOP(s);
  65                 dt_stat_finalize(s);
  66         }
  67 }