Jmeter moodle testing for max concurrent usage

I have a VPS where a moodle site is working (4GB, 4CPU,Centos). In its domain a production site and another subdomain a test site is functional. I would like to test how many concurrent users can take a quiz on my server. I was told about JMeter and related moodle scripts to do that. The documentation says JMeter test should not be conducted on a production server but only on development system. Can I call the second moodle site on same server as a development system? Do I need completely different vps for testing?