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

[Ingomar Otter]

This may be a good starting point
"Troubleshooting and  Diagnostic Guide"
http://java.sun.com/j2se/1.5/pdf/jdk50_ts_guide.pdf

--I


Am 29.09.2008 um 19:06 schrieb 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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