From the monit screen: SYSTEM memory: 18.1% [189964 kB] php5-fpm memory: 49.0% [514512 kB] Code: [email protected] I understand that monit [SYSTEM memory] is total memory used. This is in par with the "free" command reporting 193580 KB used. The php5-fpm memory: 49.0% [514512 kB] must be wrong. How can it be greater than the total memory used? It must have something to do with calculating wrong the memory used by each process of php.