Ingomar, I tried jmap -heap:format=b, but got some errors and jhat could not parse the dump file. Then I tried jmap -histo and I added up all objects' memory and it pretty much matched what I saw from jconsole. Is there any chance that jmap -histo and -heap return different result? Thanks. -Ping -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Ingomar Otter Sent: Monday, September 29, 2008 12:47 PM To: Rules Users List Subject: Re: [rules-users] memory issue when listening to market data Given the information remote diagnosis is not feasible. I would suggest to have a look at the heap ... to see where things are going. See http://weblogs.java.net/blog/kellyohair/archive/2005/09/heap_dump_snaps . html --Ingomar Am 29.09.2008 um 17:30 schrieb Cheng, Ping: > All, > > I wrote a server which listens to the market data and generates > alerts > based on some conditions. > It listens to about 300 symbols and contains 30 simple rules. It > works > fine when the market is quiet. It uses about 500 M in memory and > there > is no big difference between reports from top and jconsole. When > market > is busy, memory displayed in jconsole is still ok, but top reports > much > more memory and it did not come down at all. Sometimes it could reach > 50G when it's a crazy day. > > I used jmap to check the memory map and it looks fine from java > view, I > wonder if drools hold something when it's very busy? What is > supposed to > happen if drools could not handle the work load? > > Thanks for your help. > > -Ping > > ----------------------------------------- > The information contained in the linked e-mail transmission and any > attachments may be > privileged and confidential and is intended only for the use of the > person(s) named in the > linked e-mail transmission. If you are not the intended recipient, > or an employee or agent > responsible for delivering this message to the intended recipient, > you should not review, > disseminate, distribute or duplicate this e-mail transmission or any > attachments . If you > are not the intended recipient, please contact the sender > immediately by reply e-mail and > destroy all copies of the original message. 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