get load average of the system
() function returns the
number of processes in the system run queue of the kernel indicated by
, averaged over various periods of time. Up
samples are retrieved and assigned
to successive elements of loadavg
system imposes a maximum of 3 samples, representing averages over the last 1,
5, and 15 minutes, respectively.
If the load average was unobtainable, -1 is returned. Otherwise, the number of
samples actually retrieved is returned.