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I notice that default tomcat 7 thread pool size seems to be 200.
But normal CPU seems have 16 cores.
So only 16 threads can be executed paralleld
Why does tomcat use so much threads.
For long years many single core computer have been around and were able to run functions in a “pseudo-parallel” mode, that said, you might have 16 threads running in real parallel mode and others running in pseudo parallel.
For more information look at this: Parallel Computing
To answer your question, these threads are useful to process requests, a bunch of them will be used for attending http requests and others will be used on calling the application logic.