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Full Discussion: Displaying elapsed time...
Top Forums Programming Displaying elapsed time... Post 15845 by Perderabo on Wednesday 20th of February 2002 01:38:32 PM
Old 02-20-2002
By using time() we are getting total elapsed time between the start and finish of the program. If we switch to clock(), we get the cpu time used. For some programs these will be nearly the same thing. But put a:
sleep(60);
in a program and now there is a big difference. For 60 seconds the process will be sleeping waiting a signal. Those 60 seconds will not show up with clock() since the cpu is not being used. They will show up with time().

And clock() also counts cpu time used by child processes that have exited and been reaped via wait(). In a multiprocessor environment the clock() time could exceed the time() time.
 

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LEARN ABOUT CENTOS

tapset::timestamp_monotonic

tapset::timestamp_monotonic(3stap)										tapset::timestamp_monotonic(3stap)

NAME

       tapset::timestamp_monotonic - systemtap timestamp_monotonic tapset

DESCRIPTION

       cpu_clock_ns
	      Number of nanoseconds on the given cpu's clock

	      See function::cpu_clock_ns(3stap)
	       for details.

       cpu_clock_us
	      Number of microseconds on the given cpu's clock

	      See function::cpu_clock_us(3stap)
	       for details.

       cpu_clock_ms
	      Number of milliseconds on the given cpu's clock

	      See function::cpu_clock_ms(3stap)
	       for details.

       cpu_clock_s
	      Number of seconds on the given cpu's clock

	      See function::cpu_clock_s(3stap)
	       for details.

       local_clock_ns
	      Number of nanoseconds on the local cpu's clock

	      See function::local_clock_ns(3stap)
	       for details.

       local_clock_us
	      Number of microseconds on the local cpu's clock

	      See function::local_clock_us(3stap)
	       for details.

       local_clock_ms
	      Number of milliseconds on the local cpu's clock

	      See function::local_clock_ms(3stap)
	       for details.

       local_clock_s
	      Number of seconds on the local cpu's clock

	      See function::local_clock_s(3stap)
	       for details.

SEE ALSO

	  function::cpu_clock_ns(3stap),      function::cpu_clock_us(3stap),	 function::cpu_clock_ms(3stap),    function::cpu_clock_s(3stap),
       function::local_clock_ns(3stap),  function::local_clock_us(3stap),    function::local_clock_ms(3stap),	 function::local_clock_s(3stap),
       stap(1), stapprobes(3stap)

IBM
									---					tapset::timestamp_monotonic(3stap)
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