- Method
gethrvtime
int gethrvtime(void|int nsec)
- Description
Return the CPU time that has been consumed by this process or
thread. -1 is returned if the system couldn't determine it. The
time is normally returned in microseconds, but if the optional
argument nsec is nonzero it's returned in nanoseconds.
The CPU time includes both user and system time, i.e. it's
approximately the same thing you would get by adding together the
"utime" and "stime" fields returned by System.getrusage (but
perhaps with better accuracy).
It's however system dependent whether or not it's the time
consumed in all threads or in the current one only;
System.CPU_TIME_IS_THREAD_LOCAL tells which. If both types are
available then thread local time is preferred.
- Note
The actual accuracy on many systems is significantly less than
microseconds or nanoseconds. See System.CPU_TIME_RESOLUTION .
- Note
The garbage collector might run automatically at any time. The
time it takes is not included in the figure returned by this
function, so that normal measurements aren't randomly clobbered
by it. Explicit calls to gc are still included, though.
- Note
The special function gauge is implemented with this function.
- See also
System.CPU_TIME_IS_THREAD_LOCAL , System.CPU_TIME_RESOLUTION ,
gauge() , System.getrusage() , gethrtime()
gethrtime()