umfpack_tictoc.c
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/* ========================================================================== */
/* === umfpack_tictoc ======================================================= */
/* ========================================================================== */
/* -------------------------------------------------------------------------- */
/* UMFPACK Copyright (c) Timothy A. Davis, CISE, */
/* Univ. of Florida. All Rights Reserved. See ../Doc/License for License. */
/* web: http://www.cise.ufl.edu/research/sparse/umfpack */
/* -------------------------------------------------------------------------- */
/*
User-callable. Returns the time in seconds used by the process, and
the current wall clock time. BE CAREFUL: if you compare the run time of
UMFPACK with other sparse matrix packages, be sure to use the same timer.
See umfpack_tictoc.h for details.
These routines conform to the POSIX standard. See umf_config.h for
more details.
*/
#include "umf_internal.h"
#ifdef NO_TIMER
/* -------------------------------------------------------------------------- */
/* no timer used if -DNO_TIMER is defined at compile time */
/* -------------------------------------------------------------------------- */
void umfpack_tic (double stats [2])
{
stats [0] = 0 ;
stats [1] = 0 ;
}
void umfpack_toc (double stats [2])
{
stats [0] = 0 ;
stats [1] = 0 ;
}
#else
/* -------------------------------------------------------------------------- */
/* timer routines, using either times() or clock() */
/* -------------------------------------------------------------------------- */
#define TINY_TIME 1e-4
#ifndef NPOSIX
#include <unistd.h>
#include <sys/times.h>
void umfpack_tic (double stats [2])
{
/* Return the current time */
/* stats [0]: current wallclock time, in seconds */
/* stats [1]: user + system time for the process, in seconds */
double ticks ;
struct tms t ;
ticks = (double) sysconf (_SC_CLK_TCK) ;
stats [0] = (double) times (&t) / ticks ;
stats [1] = (double) (t.tms_utime + t.tms_stime) / ticks ;
/* if time is tiny, just return zero */
if (stats [0] < TINY_TIME) stats [0] = 0 ;
if (stats [1] < TINY_TIME) stats [1] = 0 ;
}
#else
/* Generic ANSI C: use the ANSI clock function. No wallclock time. */
#include <time.h>
void umfpack_tic (double stats [2])
{
stats [0] = 0 ;
stats [1] = ((double) (clock ( ))) / ((double) (CLOCKS_PER_SEC)) ;
if (stats [1] < TINY_TIME) stats [1] = 0 ;
}
#endif
/* -------------------------------------------------------------------------- */
void umfpack_toc (double stats [2])
{
/* Return the current time since the last call to umfpack_tic. */
/* On input, stats holds the values returned by umfpack_tic. */
/* On ouput, stats holds the time since the last umfpack_tic. */
double done [2] ;
umfpack_tic (done) ;
stats [0] = done [0] - stats [0] ;
stats [1] = done [1] - stats [1] ;
if (stats [0] < 0) stats [0] = 0 ;
if (stats [1] < 0) stats [1] = 0 ;
}
#endif