What tools/commands should I use to determine RAM, hard disk, cpu usage to increase performance even further?

[konst3]

What tools/commands should I use to determine RAM, hard disk, CPU usage to increase performance even further?

For instance how should I determine what options OPENSEARCH_JAVA_OPTS=-Xms512m -Xmx512m should I use?

[punkovain]

Take a look here:

Monitors