third_party/tcmalloc/vendor/src/tests/profiler_unittest.cc

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  29
  30 // ---
  31 // Author: Craig Silverstein
  32 //
  33 // Does some simple arithmetic and a few libc routines, so we can profile it.
  34 // Define WITH_THREADS to add pthread functionality as well (otherwise, btw,
  35 // the num_threads argument to this program is ingored).
  36
  37 #include "config_for_unittests.h"
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #ifdef HAVE_UNISTD_H
  41 #include <unistd.h>                 // for fork()
  42 #endif
  43 #include <sys/wait.h>               // for wait()
  44 #include "gperftools/profiler.h"
  45 #include "base/simple_mutex.h"
  46 #include "tests/testutil.h"
  47
  48 static int result = 0;
  49 static int g_iters = 0;   // argv[1]
  50
  51 Mutex mutex(Mutex::LINKER_INITIALIZED);
  52
  53 static void test_other_thread() {
  54 #ifndef NO_THREADS
  55   ProfilerRegisterThread();
  56
  57   int i, m;
  58   char b[128];
  59   MutexLock ml(&mutex);
  60   for (m = 0; m < 1000000; ++m) {          // run millions of times
  61     for (i = 0; i < g_iters; ++i ) {
  62       result ^= i;
  63     }
  64     snprintf(b, sizeof(b), "other: %d", result);  // get some libc action
  65   }
  66 #endif
  67 }
  68
  69 static void test_main_thread() {
  70   int i, m;
  71   char b[128];
  72   MutexLock ml(&mutex);
  73   for (m = 0; m < 1000000; ++m) {          // run millions of times
  74     for (i = 0; i < g_iters; ++i ) {
  75       result ^= i;
  76     }
  77     snprintf(b, sizeof(b), "same: %d", result);  // get some libc action
  78   }
  79 }
  80
  81 int main(int argc, char** argv) {
  82   if ( argc <= 1 ) {
  83     fprintf(stderr, "USAGE: %s <iters> [num_threads] [filename]\n", argv[0]);
  84     fprintf(stderr, "   iters: How many million times to run the XOR test.\n");
  85     fprintf(stderr, "   num_threads: how many concurrent threads.\n");
  86     fprintf(stderr, "                0 or 1 for single-threaded mode,\n");
  87     fprintf(stderr, "                -# to fork instead of thread.\n");
  88     fprintf(stderr, "   filename: The name of the output profile.\n");
  89     fprintf(stderr, ("             If you don't specify, set CPUPROFILE "
  90                      "in the environment instead!\n"));
  91     return 1;
  92   }
  93
  94   g_iters = atoi(argv[1]);
  95   int num_threads = 1;
  96   const char* filename = NULL;
  97   if (argc > 2) {
  98     num_threads = atoi(argv[2]);
  99   }
 100   if (argc > 3) {
 101     filename = argv[3];
 102   }
 103
 104   if (filename) {
 105     ProfilerStart(filename);
 106   }
 107
 108   test_main_thread();
 109
 110   ProfilerFlush();                           // just because we can
 111
 112   // The other threads, if any, will run only half as long as the main thread
 113   RunManyThreads(test_other_thread, num_threads);
 114
 115   // Or maybe they asked to fork.  The fork test is only interesting
 116   // when we use CPUPROFILE to name, so check for that
 117 #ifdef HAVE_UNISTD_H
 118   for (; num_threads < 0; ++num_threads) {   // -<num_threads> to fork
 119     if (filename) {
 120       printf("FORK test only makes sense when no filename is specified.\n");
 121       return 2;
 122     }
 123     switch (fork()) {
 124       case -1:
 125         printf("FORK failed!\n");
 126         return 1;
 127       case 0:             // child
 128         return execl(argv[0], argv[0], argv[1], NULL);
 129       default:
 130         wait(NULL);       // we'll let the kids run one at a time
 131     }
 132   }
 133 #endif
 134
 135   test_main_thread();
 136
 137   if (filename) {
 138     ProfilerStop();
 139   }
 140
 141   return 0;
 142 }