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100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 1991-2010 OpenCFD Ltd.
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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Description
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Starts timing CPU usage and return elapsed time from start.
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\*---------------------------------------------------------------------------*/
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#include "cpuTime.H"
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#include <unistd.h>
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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// * * * * * * * * * * * * * * * Static Members * * * * * * * * * * * * * * //
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long cpuTime::Hz_(sysconf(_SC_CLK_TCK));
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// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
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void cpuTime::getTime(struct tms& t)
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{
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times(&t);
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}
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double cpuTime::timeDifference
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(
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const struct tms& start,
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const struct tms& end
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)
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{
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return
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(
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double
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(
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(end.tms_utime + end.tms_stime)
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- (start.tms_utime + start.tms_stime)
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)/Hz_
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);
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}
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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cpuTime::cpuTime()
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{
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getTime(startTime_);
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lastTime_ = startTime_;
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newTime_ = startTime_;
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}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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double cpuTime::elapsedCpuTime() const
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{
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getTime(newTime_);
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return timeDifference(startTime_, newTime_);
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}
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double cpuTime::cpuTimeIncrement() const
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{
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lastTime_ = newTime_;
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getTime(newTime_);
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return timeDifference(lastTime_, newTime_);
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace Foam
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// ************************************************************************* //
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