Linux Certif

Toute la documentation sur la certification Linux LPI

FTTIME

NAME

ttime - Get LAM timer value in seconds.

C SYNOPSIS

 #include <net.h>
 
 double ttime ();
 

FORTRAN SYNOPSIS

double precision FTTIME()

DESCRIPTION

The ttime() function enables a program running on any LAM node to read the current value of the system timer in a portable fashion. This is useful for measuring execution times of program sections. ttime() returns the timer value in seconds as a double precision floating point number.

EXAMPLE

 
 #include <stdio.h>
 #include <net.h>
 
 double         time, start, end;
 
 start = ttime();
 my_sub();
 end = ttime();
 time = end - start;
 printf("my_sub took: %f seconds to execute\n", time);
 

BUGS

The resolution of the measurements is bound by that of the underlying system timer used.