tests/perf_spawn_fork.c

   1 #ifdef T_NAMESPACE
   2 #undef T_NAMESPACE
   3 #endif
   4 #include <darwintest.h>
   5
   6 #include <spawn.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9
  10 T_GLOBAL_META(
  11         T_META_NAMESPACE("xnu.perf"),
  12         T_META_CHECK_LEAKS(false),
  13         T_META_TAG_PERF
  14         );
  15
  16 #define SPAWN_MEASURE_LOOP(s) \
  17         char *args[] = {"/usr/bin/true", NULL}; \
  18         int err; \
  19         pid_t pid; \
  20         int status; \
  21         while (!dt_stat_stable(s)) { \
  22                 T_STAT_MEASURE(s) { \
  23                         err = posix_spawn(&pid, args[0], NULL, NULL, args, NULL); \
  24                 } \
  25                 if (err) { \
  26                         T_FAIL("posix_spawn returned %d", err); \
  27                 } \
  28                 waitpid(pid, &status, 0); \
  29                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { \
  30                         T_FAIL("Child process of posix_spawn failed to run"); \
  31                 } \
  32         }
  33
  34 T_DECL(posix_spawn_platform_binary_latency, "posix_spawn platform binary latency") {
  35         {
  36                 dt_stat_time_t s = dt_stat_time_create("time");
  37                 SPAWN_MEASURE_LOOP(s);
  38                 dt_stat_finalize(s);
  39         }
  40
  41         {
  42                 dt_stat_thread_cpu_time_t s = dt_stat_thread_cpu_time_create("on_cpu_time");
  43                 SPAWN_MEASURE_LOOP(s);
  44                 dt_stat_finalize(s);
  45         }
  46 }
  47
  48 #define FORK_MEASURE_LOOP(s) \
  49         pid_t pid; \
  50         int status; \
  51         while (!dt_stat_stable(s)) { \
  52                 T_STAT_MEASURE(s) { \
  53                         pid = fork(); \
  54                         if (pid == 0) \
  55                                 exit(0); \
  56                         else if (pid == -1) \
  57                                 T_FAIL("fork returned -1"); \
  58                 } \
  59                 waitpid(pid, &status, 0); \
  60                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { \
  61                         T_FAIL("forked process failed to exit properly"); \
  62                 } \
  63         }
  64
  65 T_DECL(fork, "fork latency") {
  66         {
  67                 dt_stat_time_t s = dt_stat_time_create("time");
  68                 FORK_MEASURE_LOOP(s);
  69                 dt_stat_finalize(s);
  70         }
  71         {
  72                 dt_stat_thread_cpu_time_t s = dt_stat_thread_cpu_time_create("on_cpu_time");
  73                 FORK_MEASURE_LOOP(s);
  74                 dt_stat_finalize(s);
  75         }
  76 }