Dear all, Getting the JVM size too big can cause as many problems as having it too small: It has to be right sized. The application owner has to determine the correct size for the dataset, which in the case of the Midtier, involves using some load testing tools and optimising the cache for the way in which the product is being used.
In terms of setting JVM flags, ms and mx should be reasonable close to each other ideally equal for an application server the application server is managing object within the JVM. If you have large difference and ms is too small, every time the heap has to be grown into the gap you will suffer a performance penalty. If you need a heap of a certain size then that should be given to the JVM when it starts up so growing the heap is a rare event. I normally advise to set mx to be 10% more than ms or 128MB whichever is less that allows for the situation where an unexpected situation arises and a little more heap is needed. Monitoring if the "head room" is ever used, will also warn for memory leaks or that youve not go your heap quite big enough to cope with the normal working set size. John Baker -- Java System Solutions - home of the SSO Plugin for the AR System http://www.javasystemsolutions.com _______________________________________________________________________________ UNSUBSCRIBE or access ARSlist Archives at www.arslist.org Platinum Sponsor:[email protected] ARSlist: "Where the Answers Are"
