What are best tests for Linux server in terms of database efficiency, RAM usage, simulated load for X users?

I am looking for Linux server tests to check: - MySQL database efficiency (something like https://i.imgur.com/U5f4O6r.png) - server load under simulated X users - RAM memory usage (that is the most important)

Are ApacheBench / SysBench good for that ? What else can I use ?