11-21-2001
Quote:
Originally posted by Perderabo
There is a time command and a times sytem call that can be used to time a process. But the resolution is usually 1/100 second.
Is there a difference between unix and linux.
Actually which version of unix are we talking about? I did a man on time on Linux and the resolution is in terms of seconds rather than miliseconds.
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CLOCK(3) Linux Programmer's Manual CLOCK(3)
NAME
clock - determine processor time
SYNOPSIS
#include <time.h>
clock_t clock(void);
DESCRIPTION
The clock() function returns an approximation of processor time used by the program.
RETURN VALUE
The value returned is the CPU time used so far as a clock_t; to get the number of seconds used, divide by CLOCKS_PER_SEC. If the processor
time used is not available or its value cannot be represented, the function returns the value (clock_t) -1.
CONFORMING TO
C89, C99, POSIX.1-2001. POSIX requires that CLOCKS_PER_SEC equals 1000000 independent of the actual resolution.
NOTES
The C standard allows for arbitrary values at the start of the program; subtract the value returned from a call to clock() at the start of
the program to get maximum portability.
Note that the time can wrap around. On a 32-bit system where CLOCKS_PER_SEC equals 1000000 this function will return the same value
approximately every 72 minutes.
On several other implementations, the value returned by clock() also includes the times of any children whose status has been collected via
wait(2) (or another wait-type call). Linux does not include the times of waited-for children in the value returned by clock(). The
times(2) function, which explicitly returns (separate) information about the caller and its children, may be preferable.
SEE ALSO
clock_gettime(2), getrusage(2), times(2)
COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU
2008-08-28 CLOCK(3)