third_party/tcmalloc/chromium/src/tests/sampling_test.cc

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  29
  30 // ---
  31 // Author: Craig Silverstein
  32 //
  33 // This tests ReadStackTraces and ReadGrowthStackTraces.  It does this
  34 // by doing a bunch of allocations and then calling those functions.
  35 // A driver shell-script can call this, and then call pprof, and
  36 // verify the expected output.  The output is written to
  37 // argv[1].heap and argv[1].growth
  38
  39 #include "config_for_unittests.h"
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string>
  43 #include "base/logging.h"
  44 #include <gperftools/malloc_extension.h>
  45
  46 using std::string;
  47
  48 extern "C" void* AllocateAllocate() ATTRIBUTE_NOINLINE;
  49
  50 extern "C" void* AllocateAllocate() {
  51   // The VLOG's are mostly to discourage inlining
  52   VLOG(1, "Allocating some more");
  53   void* p = malloc(10000);
  54   VLOG(1, "Done allocating");
  55   return p;
  56 }
  57
  58 static void WriteStringToFile(const string& s, const string& filename) {
  59   FILE* fp = fopen(filename.c_str(), "w");
  60   fwrite(s.data(), 1, s.length(), fp);
  61   fclose(fp);
  62 }
  63
  64 int main(int argc, char** argv) {
  65   if (argc < 2) {
  66     fprintf(stderr, "USAGE: %s <base of output files>\n", argv[0]);
  67     exit(1);
  68   }
  69   for (int i = 0; i < 8000; i++) {
  70     AllocateAllocate();
  71   }
  72
  73   string s;
  74   MallocExtension::instance()->GetHeapSample(&s);
  75   WriteStringToFile(s, string(argv[1]) + ".heap");
  76
  77   s.clear();
  78   MallocExtension::instance()->GetHeapGrowthStacks(&s);
  79   WriteStringToFile(s, string(argv[1]) + ".growth");
  80
  81   return 0;
  82 }