92 lines
2.0 KiB
C++
92 lines
2.0 KiB
C++
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// Copyright (C) 2006 Douglas Gregor <doug.gregor -at- gmail.com>
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (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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/** @file timer.hpp
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*
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* This header provides the @c timer class, which provides access to
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* the MPI timers.
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*/
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#ifndef BOOST_MPI_TIMER_HPP
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#define BOOST_MPI_TIMER_HPP
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#include <boost/mpi/config.hpp>
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#include <boost/limits.hpp>
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namespace boost { namespace mpi {
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/** @brief A simple timer that provides access to the MPI timing
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* facilities.
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*
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* The @c timer class is a simple wrapper around the MPI timing
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* facilities that mimics the interface of the Boost Timer library.
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*/
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class BOOST_MPI_DECL timer {
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public:
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/** Initializes the timer
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*
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* @post @c elapsed() == 0
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*/
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timer();
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/** Restart the timer.
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*
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* @post @c elapsed() == 0
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*/
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void restart();
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/** Return the amount of time that has elapsed since the last
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* construction or reset, in seconds.
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*/
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double elapsed() const;
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/** Return an estimate of the maximum possible value of
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* elapsed(). Note that this routine may return too high a value on
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* some systems.
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*/
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double elapsed_max() const;
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/** Returns the minimum non-zero value that @c elapsed() may
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* return. This is the resolution of the timer.
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*/
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double elapsed_min() const;
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/** Determines whether the elapsed time values are global times or
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local processor times. */
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static bool time_is_global();
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private:
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double start_time;
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}; // timer
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inline timer::timer()
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{
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restart();
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}
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inline void timer::restart()
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{
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start_time = MPI_Wtime();
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}
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inline double timer::elapsed() const
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{
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return MPI_Wtime() - start_time;
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}
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inline double timer::elapsed_max() const
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{
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return (std::numeric_limits<double>::max)();
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}
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inline double timer::elapsed_min() const
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{
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return MPI_Wtick();
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}
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} } // end namespace boost::mpi
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#endif // BOOST_MPI_TIMER_HPP
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