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Full Discussion: RDTSC use in C:
Top Forums Programming RDTSC use in C: Post 302241860 by calv on Tuesday 30th of September 2008 01:08:24 PM
Old 09-30-2008
rdtsc is not good for time measurement.

The problem is, that the CPU might throttle (with it does most of the time, when all processes are blocked), so a cpu clock might mean more time in that case. This is of course CPU and OS dependant.
 
sleep(3)						     Library Functions Manual							  sleep(3)

NAME
sleep - Suspends execution for an interval of time LIBRARY
Standard C Library (libc.a) Threads Library (libpthreads.a) SYNOPSIS
#include <unistd.h> unsigned int sleep ( unsigned int seconds ); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: sleep(): XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Specifies the number of seconds to sleep. DESCRIPTION
The sleep() function suspends execution of a process for the interval specified by the seconds parameter. The suspension time may be longer than requested due to the scheduling of other activity by the system. In a multi-threaded environment, the sleep() function is redefined so that only the calling thread is suspended. RETURN VALUES
If the sleep() function returns because the requested time has elapsed, it returns 0 (zero). If the sleep() function returns because it caught a signal, the function returns the number of seconds remaining in the suspension. RELATED INFORMATION
Commands: wall(1), shutdown(8) sleep(1) Functions: sigaction(2), alarm(3), pause(3) Standards: standards(5) delim off sleep(3)
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