BSD 2.11 - man page for getloadavg (bsd section 3)
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getloadavg - get system load averages
The getloadavg function returns the number of processes in the system run queue averaged
over various periods of time. Up to nelem samples are retrieved and assigned to succes-
sive elements of loadavg. The system imposes a maximum of 3 samples, representing aver-
ages 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.
uptime(1), sysctl(3), sysctl(8).
The getloadavg function appeared in 4.3BSD-Reno.
This function replaces the 2.9BSD compatibility routine getla().
4th Berkeley Distribution January 15, 1995 GETLOADAVG(3)
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