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FreeBSD 11.0 - man page for kvm_getloadavg (freebsd section 3)

KVM_GETLOADAVG(3)					   BSD Library Functions Manual 					 KVM_GETLOADAVG(3)

NAME
kvm_getloadavg -- get load average of the system
LIBRARY
Kernel Data Access Library (libkvm, -lkvm)
SYNOPSIS
#include <kvm.h> int kvm_getloadavg(kvm_t *kd, double loadavg[], int nelem);
DESCRIPTION
The kvm_getloadavg() function returns the number of processes in the system run queue of the kernel indicated by kd, 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 sam- ples, representing averages over the last 1, 5, and 15 minutes, respectively.
DIAGNOSTICS
If the load average was unobtainable, -1 is returned; otherwise, the number of samples actually retrieved is returned.
SEE ALSO
uptime(1), getloadavg(3), kvm(3)
BSD
June 4, 1993 BSD