mirror of https://gitee.com/bigwinds/arangodb
54 lines
1.1 KiB
C++
54 lines
1.1 KiB
C++
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// Copyright Oliver Kowalke 2009.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef ZEIT_H
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#define ZEIT_H
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#include <time.h>
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#include <algorithm>
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#include <numeric>
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#include <cstddef>
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#include <vector>
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#include <boost/assert.hpp>
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#include <boost/bind.hpp>
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#include <boost/cstdint.hpp>
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typedef boost::uint64_t zeit_t;
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inline
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zeit_t zeit()
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{
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timespec t;
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::clock_gettime( CLOCK_PROCESS_CPUTIME_ID, & t);
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return t.tv_sec * 1000000000 + t.tv_nsec;
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}
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struct measure_zeit
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{
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zeit_t operator()()
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{
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zeit_t start( zeit() );
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return zeit() - start;
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}
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};
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inline
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zeit_t overhead_zeit()
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{
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std::size_t iterations( 10);
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std::vector< zeit_t > overhead( iterations, 0);
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for ( std::size_t i( 0); i < iterations; ++i)
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std::generate(
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overhead.begin(), overhead.end(),
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measure_zeit() );
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BOOST_ASSERT( overhead.begin() != overhead.end() );
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return std::accumulate( overhead.begin(), overhead.end(), 0) / iterations;
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}
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#endif // ZEIT_H
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