Memory usage misreported in output of pmp-check-unix-memory

Archived Projects Percona Monitoring Plugins
1

I’m seeing some strange output from the pmp-check-unix-memory check. It’s reporting that 10% of the overall memory is in use, but that 102% of the memory is in use by the mysqld process. The server is running Debian Squeeze. Has anyone seen this before?

Output of free:

free

total used free shared buffers cached
Mem: 16473956 3013068 13460888 0 327656 876756
-/+ buffers/cache: 1808656 14665300
Swap: 3903480 0 3903480

Output of top command:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
24523 mysql 20 0 16.1g 1.5g 5916 S 0 9.8 0:26.85 mysqld

Output of pmp-check-unix-memory:

2

From this output I see mysqld reports VIRT (virtual memory) 16.1g.
And it is 102% from the total RAM.

You can disable the plugin from checking the largest process in the memory by using ‘-d’ option.
This way the plugin will report the correct status.