High CPU, possibly due to context switching?

Question

One of our servers is experiencing a very high CPU load with our application. We\'ve looked at various stats and are having issues finding the source of the problem.

One

Answer 1

I think your constraints are unreasonable. Basically what you are saying is:

1.I can't change anything
2.I can't measure anything

Can you please speculate as to what my problem might be?

The real answer to this is that you need to hook a proper profiler to the application and you need to correlate what you see with CPU usage, Disk/Network I/O, and memory.

Remember the 80/20 rule of performance tuning. 80% will come from tuning your application. You might just have too much load for one VM instance and it could be time to consider solutions for scaling horizontally or vertically by giving more resources to the machine. It could be any one of the 3 billion JVM settings are not inline with your application's execution specifics.

I assume the 3000 thread pool came from the famous more threads = more concurrency = more performance theory. The real answer is a tuning change isn't worth anything unless you measure throughput and response time before/after the change and compared the results.