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1 | |
2 | // Copyright Oliver Kowalke 2009. | |
3 | // Distributed under the Boost Software License, Version 1.0. | |
4 | // (See accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt) | |
6 | ||
7 | #ifndef ZEIT_H | |
8 | #define ZEIT_H | |
9 | ||
10 | #include <time.h> | |
11 | ||
12 | #include <algorithm> | |
13 | #include <numeric> | |
14 | #include <cstddef> | |
15 | #include <vector> | |
16 | ||
17 | #include <boost/assert.hpp> | |
18 | #include <boost/bind.hpp> | |
19 | #include <boost/cstdint.hpp> | |
20 | ||
21 | typedef boost::uint64_t zeit_t; | |
22 | ||
23 | inline | |
24 | zeit_t zeit() | |
25 | { | |
26 | timespec t; | |
27 | ::clock_gettime( CLOCK_PROCESS_CPUTIME_ID, & t); | |
28 | return t.tv_sec * 1000000000 + t.tv_nsec; | |
29 | } | |
30 | ||
31 | struct measure_zeit | |
32 | { | |
33 | zeit_t operator()() | |
34 | { | |
35 | zeit_t start( zeit() ); | |
36 | return zeit() - start; | |
37 | } | |
38 | }; | |
39 | ||
40 | inline | |
41 | zeit_t overhead_zeit() | |
42 | { | |
43 | std::size_t iterations( 10); | |
44 | std::vector< zeit_t > overhead( iterations, 0); | |
45 | for ( std::size_t i( 0); i < iterations; ++i) | |
46 | std::generate( | |
47 | overhead.begin(), overhead.end(), | |
48 | measure_zeit() ); | |
49 | BOOST_ASSERT( overhead.begin() != overhead.end() ); | |
50 | return std::accumulate( overhead.begin(), overhead.end(), 0) / iterations; | |
51 | } | |
52 | ||
53 | #endif // ZEIT_H |