The pset_getloadavg() function returns the number of processes assigned to the specified processor set that are in the system run queue, averaged over various periods of time. Up to nelem samples are retrieved and assigned to successive elements of loadavg[]. The system imposes a maximum of 3 samples, representing averages over the last 1, 5, and 15 minutes, respectively.

The LOADAVG_1MIN, LOADAVG_5MIN, and LOADAVG_15MIN indices, defined in <sys/loadavg.h>, can be used to extract the data from the appropriate element of the loadavg[] array.

If pset is PS_NONE, the load average for processes not assigned to a processor set is returned.

If pset is PS_MYID, the load average for the processor set to which the caller is bound is returned. If the caller is not bound to a processor set, the result is the same as if PS_NONE was specified.

Upon successful completion, the number of samples actually retrieved is returned. If the load average was unobtainable or the processor set does not exist, -1 is returned and errno is set to indicate the error.

The pset_getloadavg() function will fail if:

EINVAL

The number of elements specified is less than 0, or an invalid processor set ID was specified.

See attributes(5) for descriptions of the following attributes:

uptime(1), w(1), psrset(1M), prstat(1M), pset_bind(2), pset_create(2), kstat(3KSTAT), attributes(5)