getloadavg man page

getloadavg — get system load averages

Synopsis

#include <stdlib.h>

int getloadavg(double loadavg[], int nelem);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

getloadavg():

Since glibc 2.19:
    _DEFAULT_SOURCE
In glibc up to and including 2.19:
    _BSD_SOURCE

Description

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 successive elements of loadavg[]. The system imposes a maximum of 3 samples, representing averages over the last 1, 5, and 15 minutes, respectively.

Return Value

If the load average was unobtainable, -1 is returned; otherwise, the number of samples actually retrieved is returned.

Versions

This function is available in glibc since version 2.2.

Attributes

For an explanation of the terms used in this section, see attributes(7).

InterfaceAttributeValue
getloadavg()Thread safetyMT-Safe

Conforming to

Not in POSIX.1. Present on the BSDs and Solaris.

See Also

uptime(1), proc(5)

Colophon

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Info

2016-03-15 Linux Linux Programmer's Manual