Check manual page of statgrab_mem
Usage of physical and virtual RAM
This check measures the current usage of physical RAM and
virtual memory used by processes. You can define a warning
and critical level for the usage of virtual memory,
not for the usage of RAM.
Check_mk lets you define levels in percentage of
the physically installed RAM or as absolute
values in MB. The default levels
are at 150% and 200%. That means that this check
gets critical if the memory used by processes
is twice the size of your RAM.
See check manpage for mem.used too.
Make sure you have the statgrab binary available on the monitored
machine. Under HP-UX you also need to activate the hpux_statgrab agent plugin.
Finds one service on every machine with statgrab: The memory used.