机器在压力下的零星行为

we are doing some java stress runs (involving network IO). Initially things are all fine and the system responds very fast (avg latency in test 2ms). But hours later when i redo the same test i observe the performace goes down (20 - 60ms). Its the same Jar files, same JVM, and the same LAN over which the stress is runnig. i am not understanding the reason for this behavior.we are doing some java stress runs (involving n