Thanks all of you for your tips. They have gave us a lot of indication how to tackle this..
Great.,,, Mark H. Wood wrote:
What kind of processors specifically? In a 32-bit address space, there's no point in giving Tomcat more than 2GB, because the JVM won't use it. If you have 64-bit userspace and a JVM built for it then you can use more, but remember to leave a bit for OS caches, other processes, etc. (Starve the block cache and your disk I/O throughput will suffer.) From somewhere I recall a rule of thumb: if the box's primary duty is to run a single Java app., give that app. up to 75% of physical memory. But that's a rule of thumb, and could be made nonsense by unusual hardware or an unusual app. Any answer you get here should be taken as initial conditions for a tuning exercise: start there, measure performance and resource utilization, theorize, adjust, repeat until you get the performance you need or are convinced that you can't without changing something else (application design, bigger/faster hardware, network optimization, whatever).
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