Is there a way to measure the wall time between two points in a multi-threaded program in milli-seconds resolution? I am familiar with boost time_t, but its resolution is seconds, not milli-seconds. Methods from MKL library are welcome.
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Is there a way to measure the wall time between two points in a multi-threaded program in milli-seconds resolution? I am familiar with boost time_t, but its resolution is seconds, not milli-seconds. Methods from MKL library are welcome.
On any modern POSIX system (like Linux), call clock_gettime with
CLOCK_MONOTONIC.[update]
By “wall time”, I assume you mean the time that actually elapses between two points. If you mean reading the actual time of day, use
CLOCK_REALTIMEinstead ofCLOCK_MONOTONIC. (The difference is how they behave if the user should change the system clock in the middle of your measurement.CLOCK_REALTIMEwill reflect that change whileCLOCK_MONOTONICwill not.)[update 2]
C++11 has built-in facilities for this in the std::chrono namespace. So if you have C++11, that is the most portable and future-proof option.