check/time_hashmap.cpp

   1 /** @file time_hashmap.cpp
   2  *
   3  *  Timings for exhashmap<> operations. */
   4
   5 /*
   6  *  GiNaC Copyright (C) 1999-2011 Johannes Gutenberg University Mainz, Germany
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  21  */
  22
  23 #include "ginac.h"
  24 #include "timer.h"
  25 using namespace GiNaC;
  26
  27 #include <iostream>
  28 #include <vector>
  29 using namespace std;
  30
  31 template <class T>
  32 static void run_timing(unsigned size, double &time_insert, double &time_find, double &time_erase)
  33 {
  34         vector<symbol> S;
  35         T M;
  36         timer t;
  37
  38         S.reserve(size);
  39         for (unsigned i=0; i<size; ++i)
  40                 S.push_back(symbol());
  41
  42         t.start();
  43         for (unsigned i=0; i<size; ++i)
  44                 M[S[i]] = S[(i+1)%size];
  45         time_insert = t.read();
  46
  47         t.start();
  48         for (unsigned i=0; i<size; ++i) {
  49                 if (!M[S[i]].is_equal(S[(i+1)%size])) {
  50                         clog << "map lookup failed" << endl;
  51                         return;
  52                 }
  53         }
  54         time_find = t.read();
  55
  56         t.start();
  57         for (unsigned i=0; i<size; ++i) {
  58                 if (M.erase(S[i]) != 1) {
  59                         clog << "erasing element " << S[i] << " failed" << endl;
  60                         return;
  61                 }
  62         }
  63         if (!M.empty()) {
  64                 clog << "map not empty (size = " << M.size() << ") after erasing all elements" << endl;
  65                 return;
  66         }
  67         time_erase = t.read();
  68 }
  69
  70
  71 unsigned time_hashmap()
  72 {
  73         unsigned result = 0;
  74
  75         cout << "timing hash map operations" << flush;
  76
  77         unsigned s[] = {10000, 50000, 100000, 500000};
  78         vector<unsigned> sizes(s, s+sizeof(s)/sizeof(*s));
  79
  80         vector<double> times_insert, times_find, times_erase;
  81
  82         for (vector<unsigned>::const_iterator i = sizes.begin(); i != sizes.end(); ++i) {
  83                 double time_insert, time_find, time_erase;
  84
  85                 run_timing< exhashmap<ex> >(*i, time_insert, time_find, time_erase);
  86
  87 // If you like, you can compare it with this:
  88 //              run_timing< std::map<ex, ex, ex_is_less> >(*i, time_insert, time_find, time_erase);
  89
  90                 times_insert.push_back(time_insert);
  91                 times_find.push_back(time_find);
  92                 times_erase.push_back(time_erase);
  93                 cout << '.' << flush;
  94         }
  95
  96         // print the report:
  97         cout << endl << "          size:\t";
  98         copy(sizes.begin(), sizes.end(), ostream_iterator<unsigned>(cout, "\t"));
  99         cout << endl << "      insert/s:\t";
 100         copy(times_insert.begin(), times_insert.end(), ostream_iterator<double>(cout, "\t"));
 101         cout << endl << "        find/s:\t";
 102         copy(times_find.begin(), times_find.end(), ostream_iterator<double>(cout, "\t"));
 103         cout << endl << "       erase/s:\t";
 104         copy(times_erase.begin(), times_erase.end(), ostream_iterator<double>(cout, "\t"));
 105         cout << endl;
 106
 107         return result;
 108 }
 109
 110 extern void randomify_symbol_serials();
 111
 112 int main(int argc, char** argv)
 113 {
 114         randomify_symbol_serials();
 115         cout << setprecision(2) << showpoint;
 116         return time_hashmap();
 117 }