xapian-core  1.4.20
scalability.h
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1 
4 /* Copyright (C) 2009 Olly Betts
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License as
8  * published by the Free Software Foundation; either version 2 of the
9  * License, or (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef XAPIAN_INCLUDED_SCALABILITY_H
22 #define XAPIAN_INCLUDED_SCALABILITY_H
23 
24 void test_scalability(double (*func)(unsigned), unsigned n, double threshold);
25 
26 // 10 times the work should increase the time by:
27 // O(1) : 1
28 // O(n) : 10
29 // O(n*log(n)) : 20 = 100 * log(100) / (10 * log(10))
30 // O(n*n) : 100
31 
32 #define O_N 14.1
33 #define O_N_LOG_N 44.7
34 
35 #endif // XAPIAN_INCLUDED_SCALABILITY_H
void test_scalability(double(*func)(unsigned), unsigned n, double threshold)
Definition: scalability.cc:29