libstdc++-v3/testsuite/performance/allocator.cc

   1 // Copyright (C) 2003, 2004 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 2, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING.  If not, write to the Free
  16 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17 // USA.
  18
  19 // As a special exception, you may use this file as part of a free software
  20 // library without restriction.  Specifically, if other files instantiate
  21 // templates or use macros or inline functions from this file, or you compile
  22 // this file and link it with other files to produce an executable, this
  23 // file does not by itself cause the resulting executable to be covered by
  24 // the GNU General Public License.  This exception does not however
  25 // invalidate any other reasons why the executable file might be covered by
  26 // the GNU General Public License.
  27
  28 /*
  29  * The goal with this application is to compare the performance
  30  * between different std::allocator implementations. The results are
  31  * influenced by the underlying allocator in the "C" library, malloc.
  32  */
  33
  34 // 2003-02-05 Stefan Olsson <stefan@snon.net>
  35
  36 #include <vector>
  37 #include <list>
  38 #include <typeinfo>
  39 #include <sstream>
  40 #include <ext/mt_allocator.h>
  41 #include <ext/malloc_allocator.h>
  42 #include <cxxabi.h>
  43 #include <testsuite_performance.h>
  44
  45 using namespace std;
  46 using __gnu_cxx::malloc_allocator;
  47 using __gnu_cxx::__mt_alloc;
  48
  49 typedef int test_type;
  50
  51 // The number of iterations to be performed.
  52 int iterations;
  53
  54 // The number of values to insert in the container, 32 will cause 5
  55 // (re)allocations to be performed (sizes 4, 8, 16, 32 and 64)
  56 // This means that all allocations are within _MAX_BYTES = 128 as
  57 // defined in stl_alloc.h for __pool_alloc.  Whether or not this
  58 // value is relevant in "the real world" or not I don't know and
  59 // should probably be investigated in more detail.
  60 int insert_values = 128;
  61
  62 template<typename Container>
  63   int
  64   do_loop()
  65   {
  66     int test_iterations = 0;
  67     try
  68       {
  69         Container obj;
  70         while (test_iterations < iterations)
  71           {
  72             for (int j = 0; j < insert_values; ++j)
  73               obj.push_back(test_iterations);
  74             ++test_iterations;
  75           }
  76       }
  77     catch(...)
  78       {
  79         // No point allocating all available memory, repeatedly.
  80       }
  81     return test_iterations;
  82   }
  83
  84 template<typename Container>
  85   void
  86   calibrate_iterations()
  87   {
  88     int try_iterations = iterations = 100000;
  89     int test_iterations;
  90
  91     __gnu_test::time_counter timer;
  92     timer.start();
  93     test_iterations = do_loop<Container>();
  94     timer.stop();
  95
  96     if (try_iterations > test_iterations && test_iterations > iterations)
  97       iterations = test_iterations - 100;
  98     else
  99       {
 100         double tics = timer.real_time();
 101         double iterpc = test_iterations / tics; //iterations per clock
 102         double xtics = 200; // works for linux 2gig x86
 103         iterations = static_cast<int>(xtics * iterpc);
 104       }
 105   }
 106
 107 template<typename Container>
 108   void
 109   test_container(Container obj)
 110   {
 111     using namespace __gnu_test;
 112     int status;
 113
 114     time_counter time;
 115     resource_counter resource;
 116     clear_counters(time, resource);
 117     start_counters(time, resource);
 118     int test_iterations = do_loop<Container>();
 119     stop_counters(time, resource);
 120
 121     std::ostringstream comment;
 122     comment << "iterations: " << test_iterations << '\t';
 123     comment << "type: " << abi::__cxa_demangle(typeid(obj).name(),
 124                                                0, 0, &status);
 125     report_header(__FILE__, comment.str());
 126     report_performance(__FILE__, string(), time, resource);
 127   }
 128
 129 // http://gcc.gnu.org/ml/libstdc++/2001-05/msg00105.html
 130 // http://gcc.gnu.org/ml/libstdc++/2003-05/msg00231.html
 131 int main(void)
 132 {
 133   calibrate_iterations<vector<test_type> >();
 134   test_container(vector<test_type>());
 135   test_container(vector<test_type, malloc_allocator<test_type> >());
 136   test_container(vector<test_type, __mt_alloc<test_type> >());
 137
 138   calibrate_iterations<list<test_type> >();
 139   test_container(list<test_type>());
 140   test_container(list<test_type, malloc_allocator<test_type> >());
 141   test_container(list<test_type, __mt_alloc<test_type> >());
 142
 143   return 0;
 144 }