memory/mozjemalloc_info/MozjemallocInfo.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9
  10 #include "mozmemory.h"
  11
  12 /*
  13  * Print the configured size classes which we can then use to update
  14  * documentation.
  15  */
  16 int main() {
  17   jemalloc_stats_t stats;
  18
  19   const size_t num_bins = jemalloc_stats_num_bins();
  20   const size_t MAX_NUM_BINS = 100;
  21   if (num_bins > MAX_NUM_BINS) {
  22     fprintf(stderr, "Exceeded maximum number of jemalloc stats bins");
  23     return 1;
  24   }
  25   jemalloc_bin_stats_t bin_stats[MAX_NUM_BINS] = {{0}};
  26   jemalloc_stats(&stats, bin_stats);
  27
  28   printf("Page size:    %5zu\n", stats.page_size);
  29   printf("Chunk size:   %5zuKiB\n", stats.chunksize / 1024);
  30
  31   printf("Quantum:      %5zu\n", stats.quantum);
  32   printf("Quantum max:  %5zu\n", stats.quantum_max);
  33   printf("Sub-page max: %5zu\n", stats.page_size / 2);
  34   printf("Large max:    %5zuKiB\n", stats.large_max / 1024);
  35
  36   printf("\nBin stats:\n");
  37   for (unsigned i = 0; i < num_bins; i++) {
  38     auto& bin = bin_stats[i];
  39     if (bin.size) {
  40       printf("  Bin %5zu has runs of %3zuKiB\n", bin.size,
  41              bin.bytes_per_run / 1024);
  42     }
  43   }
  44
  45   return EXIT_SUCCESS;
  46 }