As with any system, performance is a key element to getting the most return on investment as well as maintaining happy users. This document contains practices and principles specifically related to capacity planning and performance of a Sun Messaging Server which can differ or contradict conventional tuning wisdom. This document points out the landmines and areas that a Sun Messaging Server administrator should concentrate on.
Some general tips on tuning. If you change something and do not see the desired result, or any result, you should probably change things back. Changing too many things at once can cause you more harm than good, which you may not see the negative impact of in the near future. Be careful, document, document!
Be careful when tuning the number of threads in processes. Enabling another thread has side effects which include things like: virtual memory and file descriptors.