[rules-users] memory issue when listening to market data

[Cheng, Ping]

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 at lists.jboss.org
[mailto:rules-users-bounces at 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
>
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