00001 /*---------------------------------------------------------------------------*\ 00002 ========= | 00003 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox 00004 \\ / O peration | 00005 \\ / A nd | Copyright (C) 1991-2010 OpenCFD Ltd. 00006 \\/ M anipulation | 00007 ------------------------------------------------------------------------------- 00008 License 00009 This file is part of OpenFOAM. 00010 00011 OpenFOAM is free software: you can redistribute it and/or modify it 00012 under the terms of the GNU General Public License as published by 00013 the Free Software Foundation, either version 3 of the License, or 00014 (at your option) any later version. 00015 00016 OpenFOAM is distributed in the hope that it will be useful, but WITHOUT 00017 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 00018 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 00019 for more details. 00020 00021 You should have received a copy of the GNU General Public License 00022 along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>. 00023 00024 Description 00025 Starts timing CPU usage and return elapsed time from start. 00026 00027 \*---------------------------------------------------------------------------*/ 00028 00029 #include "cpuTimeImpl.H" 00030 00031 #include <unistd.h> 00032 00033 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 00034 00035 namespace Foam 00036 { 00037 00038 // * * * * * * * * * * * * * * * Static Members * * * * * * * * * * * * * * // 00039 00040 long cpuTimeImpl::Hz_(sysconf(_SC_CLK_TCK)); 00041 00042 00043 // * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * // 00044 00045 void cpuTimeImpl::getTime(struct tms& t) 00046 { 00047 times(&t); 00048 } 00049 00050 00051 double cpuTimeImpl::timeDifference 00052 ( 00053 const struct tms& start, 00054 const struct tms& end 00055 ) 00056 { 00057 return 00058 ( 00059 double 00060 ( 00061 (end.tms_utime + end.tms_stime) 00062 - (start.tms_utime + start.tms_stime) 00063 )/Hz_ 00064 ); 00065 } 00066 00067 00068 // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * // 00069 00070 cpuTimeImpl::cpuTimeImpl() 00071 { 00072 getTime(startTime_); 00073 lastTime_ = startTime_; 00074 newTime_ = startTime_; 00075 } 00076 00077 00078 // * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * // 00079 00080 double cpuTimeImpl::elapsedCpuTime() const 00081 { 00082 getTime(newTime_); 00083 return timeDifference(startTime_, newTime_); 00084 } 00085 00086 00087 double cpuTimeImpl::cpuTimeIncrement() const 00088 { 00089 lastTime_ = newTime_; 00090 getTime(newTime_); 00091 return timeDifference(lastTime_, newTime_); 00092 } 00093 00094 00095 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 00096 00097 } // End namespace Foam 00098 00099 // ************************ vim: set sw=4 sts=4 et: ************************ //
