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//------------------------------------------------------------------------------
// GraphBLAS/Demo/Include/simple_timer.h: a timer for performance measurements
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2020, All Rights Reserved
// http://suitesparse.com See GraphBLAS/Doc/License.txt for license.
//------------------------------------------------------------------------------
/*
There is no method that works on all operating systems for finding the
current time with high resolution that is suitable for performance
measurements. The simple_timer.c and simple_timer.h functions provide a
portable alternative.
simple_tic (tic) ; gets the current time and saves it in tic [0..1].
t = simple_toc (tic) ; returns the time in seconds since the last call to
simple_toc, as a single double value.
Usage:
#include "simple_timer.h"
double tic [2], r, s, t ;
simple_tic (tic) ; // start the timer
// do some work A
t = simple_toc (tic) ; // t is time for work A, in seconds
// do some work B
s = simple_toc (tic) ; // s is time for work A and B, in seconds
simple_tic (tic) ; // restart the timer
// do some work C
r = simple_toc (tic) ; // r is time for work C, in seconds
*/
#ifndef SIMPLE_TIMER_H
#define SIMPLE_TIMER_H
#ifndef GB_PUBLIC
// Exporting/importing symbols for Microsoft Visual Studio
#if ( _MSC_VER && !__INTEL_COMPILER )
#ifdef GB_LIBRARY
// compiling SuiteSparse:GraphBLAS itself, exporting symbols to user apps
#define GB_PUBLIC extern __declspec ( dllexport )
#else
// compiling the user application, importing symbols from SuiteSparse:GraphBLAS
#define GB_PUBLIC extern __declspec ( dllimport )
#endif
#else
// for other compilers
#define GB_PUBLIC extern
#endif
#endif
#include <time.h>
//------------------------------------------------------------------------------
// decide which timer to use
//------------------------------------------------------------------------------
#if defined ( _OPENMP )
// if OpenMP is available, use omp_get_wtime
#include <omp.h>
#elif defined ( __linux__ ) || defined ( __GNU__ )
// otherwise, on Linux/GNU, use clock_gettime. May require -lrt
#include <sys/time.h>
#elif defined ( __MACH__ ) && defined ( __APPLE__ )
// otherwise, on the Mac, use the MACH timer
#include <mach/clock.h>
#include <mach/mach.h>
#else
// Finally, the ANSI C11 clock() function is used if no other timer
// is available.
#endif
//------------------------------------------------------------------------------
GB_PUBLIC
void simple_tic // returns current time in seconds and nanoseconds
(
double tic [2] // tic [0]: seconds, tic [1]: nanoseconds
) ;
GB_PUBLIC
double simple_toc // returns time since last simple_tic
(
const double tic [2] // tic from last call to simple_tic
) ;
#endif
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