Host Monitor and Service Monitor Memory Configuration
You can configure Java heap size and non-Java memory size. The memory recommended for these configuration options depends on the number of hosts in the cluster, the services running on the cluster, and the number of monitored entities.
Monitored entities are the objects monitored by the Service Monitor or Host Monitor. As the number of hosts and services increases, the number of monitored entities also increases.
In addition to the memory configured, the Host Monitor and Service Monitor use the Linux page cache. Memory available for page caching on the Host Monitor and Service Monitor hosts improves performance.