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

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  29
  30 // ---
  31 // Author: Sanjay Ghemawat
  32 //
  33 // Test speed of handling fragmented heap
  34
  35 #include "config_for_unittests.h"
  36 #include <stdlib.h>
  37 #include <stdio.h>
  38 #ifdef HAVE_SYS_RESOURCE_H
  39 #include <sys/time.h>           // for struct timeval
  40 #include <sys/resource.h>       // for getrusage
  41 #endif
  42 #ifdef _WIN32
  43 #include <windows.h>            // for GetTickCount()
  44 #endif
  45 #include <vector>
  46 #include "base/logging.h"
  47 #include "common.h"
  48 #include <gperftools/malloc_extension.h>
  49
  50 using std::vector;
  51
  52 int main(int argc, char** argv) {
  53   // Make kAllocSize one page larger than the maximum small object size.
  54   static const int kAllocSize = kMaxSize + kPageSize;
  55   // Allocate 400MB in total.
  56   static const int kTotalAlloc = 400 << 20;
  57   static const int kAllocIterations = kTotalAlloc / kAllocSize;
  58
  59   // Allocate lots of objects
  60   vector<char*> saved(kAllocIterations);
  61   for (int i = 0; i < kAllocIterations; i++) {
  62     saved[i] = new char[kAllocSize];
  63   }
  64
  65   // Check the current "slack".
  66   size_t slack_before;
  67   MallocExtension::instance()->GetNumericProperty("tcmalloc.slack_bytes",
  68                                                   &slack_before);
  69
  70   // Free alternating ones to fragment heap
  71   size_t free_bytes = 0;
  72   for (int i = 0; i < saved.size(); i += 2) {
  73     delete[] saved[i];
  74     free_bytes += kAllocSize;
  75   }
  76
  77   // Check that slack delta is within 10% of expected.
  78   size_t slack_after;
  79   MallocExtension::instance()->GetNumericProperty("tcmalloc.slack_bytes",
  80                                                   &slack_after);
  81   CHECK_GE(slack_after, slack_before);
  82   size_t slack = slack_after - slack_before;
  83
  84   CHECK_GT(double(slack), 0.9*free_bytes);
  85   CHECK_LT(double(slack), 1.1*free_bytes);
  86
  87   // Dump malloc stats
  88   static const int kBufSize = 1<<20;
  89   char* buffer = new char[kBufSize];
  90   MallocExtension::instance()->GetStats(buffer, kBufSize);
  91   VLOG(1, "%s", buffer);
  92   delete[] buffer;
  93
  94   // Now do timing tests
  95   for (int i = 0; i < 5; i++) {
  96     static const int kIterations = 100000;
  97 #ifdef HAVE_SYS_RESOURCE_H
  98     struct rusage r;
  99     getrusage(RUSAGE_SELF, &r);    // figure out user-time spent on this
 100     struct timeval tv_start = r.ru_utime;
 101 #elif defined(_WIN32)
 102     long long int tv_start = GetTickCount();
 103 #else
 104 # error No way to calculate time on your system
 105 #endif
 106
 107     for (int i = 0; i < kIterations; i++) {
 108       size_t s;
 109       MallocExtension::instance()->GetNumericProperty("tcmalloc.slack_bytes",
 110                                                       &s);
 111     }
 112
 113 #ifdef HAVE_SYS_RESOURCE_H
 114     getrusage(RUSAGE_SELF, &r);
 115     struct timeval tv_end = r.ru_utime;
 116     int64 sumsec = static_cast<int64>(tv_end.tv_sec) - tv_start.tv_sec;
 117     int64 sumusec = static_cast<int64>(tv_end.tv_usec) - tv_start.tv_usec;
 118 #elif defined(_WIN32)
 119     long long int tv_end = GetTickCount();
 120     int64 sumsec = (tv_end - tv_start) / 1000;
 121     // Resolution in windows is only to the millisecond, alas
 122     int64 sumusec = ((tv_end - tv_start) % 1000) * 1000;
 123 #else
 124 # error No way to calculate time on your system
 125 #endif
 126     fprintf(stderr, "getproperty: %6.1f ns/call\n",
 127             (sumsec * 1e9 + sumusec * 1e3) / kIterations);
 128   }
 129
 130   printf("PASS\n");
 131   return 0;
 132 }