check_cpu.py – usage and IO Wait

This plugin will generate an alert if * The overall CPU usage exceeds a given threshold * The overall CPU IO Wait exceeds a given threshold * The CPU usage of any single CPU core exceeds a threshold * The CPU IO Wait of any single CPU core exceeds a threshold * The CPU steal of any single CPU core exceeds a threshold This plugin also generates performance data suitable for PNP4Nagios, and a suitable PNP4Nagios template is supplied. The template provides a neater presentation than the default. Note that this plugin measures CPU usage by reading /proc/stat twice over a time interval (default is 1 second). As such: * It is specific to Linux, and probably won't work on other systems * It does NOT rely on the python library psutil, and hence is backwards compatible with older Linux systems which do have the psutil library. New features for version 1.5 * Can alert on overall IO Wait (missing from previous versions) * Can output the raw values from /proc/stat - see option '-a' * Also outputs ctxt and processes (context switches and new processes) as performance data (no alerting, just for graphing) This plugin is a fork of check_cpu.py by Kirk Hammond, and was written to cater for older Linux distributions which do not have a the library psutil available. It also adds the feature of monitoring IO Wait explicitly.

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