使用JMeter进行测试:如何运行每秒N个请求。

I need to test if our system can perform N requests per second. Technically, it's 2 requests to one API, 2 requests to another, and 6 requests to third one. But the important thing that they should happen simultaneously - so 10 requests per second. So, in JMeter I've created three Thread Groups, first defines number of threads 1, and ramp-up time 0. Second thread group is the same, and third thread group defines number of threads 6 and ramp-up time 0. But that doesn't really guarantee it's going to run them I need to test if our system can perform N requ