Section: Linux Programmer's Manual (3)
getloadavg - get system load averages
int getloadavg(double loadavg, int nelem);
Feature Test Macro Requirements for glibc (see
Since glibc 2.19:
In glibc up to and including 2.19:
function returns the number of processes in the system run queue
averaged over various periods of time.
samples are retrieved and assigned to successive elements of
The 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.
This function is available in glibc since version 2.2.
For an explanation of the terms used in this section, see
Not in POSIX.1.
Present on the BSDs and Solaris.
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