High CPU Utilization in java application - why?

Question

I have a Java Application (web-based) that at times shows very high CPU Utilization (almost 90%) for several hours. Linux TOP command shows this. On application res

Answer 1

During these peak CPU times, what is the user load like? You say this is a web based application, so the culprits that come to mind is memory utilization issues. If you store a lot of stuff in the session, for instance, and the session count gets high enough, the app server will start thrashing about. This is also a case where the GC might make matters worse depending on the scheme you are using. More information about the app and the server configuration would be helpful in pointing towards more debugging ideas.