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Commit 8ccb03c0 authored by Hahn Axel (hahn)'s avatar Hahn Axel (hahn)
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add check_cpu.md

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# IML Checks for Icinga / Nagios
[Home](readme.md)
---
## check CPU
### Introduction
**check_cpu** is a plugin to check cpu usage and cpu io wait.
It reads cpu data from output of top command and shows
hwi - Time spent handling hardware interrupt routines. (Whenever a peripheral unit want attention form the CPU, it literally pulls a line, to signal the CPU to service it)
swi - Time spent handling software interrupt routines. (a piece of code, calls an interrupt routine...)
st - Time spent on involuntary waits by virtual cpu while hypervisor is servicing another processor (stolen from a virtual machine)
nice - Time spent running niced user processes (User defined priority)
wait - Time spent on waiting on IO peripherals (eg. disk)
system - Time spent in kernel space
user - Time spent in user space
idle - Time spent in idle operations
For all values it sends performance data.
### Syntax
``$ check_NAME [-c CRITICAL] [-w WARING] [-i CRITICAL_IO]``
#### Parameters
```text
-w VALUE cpu usage warning level (default: 75)
-c VALUE cpu usage critical level (default: 90)
-i VALUE io wait critical level (default: 50)
-h or --help show this help.
```
# Examples
``check_cpu -w 60 -c 80 -i 40``
check cpu usage.
It shows a warning if usage is higer 60%.
It shows critical status if usage is higer 80% or io wait is 40%
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