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