Ping,
I think you should focus on the content of your heap and not on the
specific size.
So here are my 0.02EUR:
1. get a working heap dump (google is your friend)
2. Inspect the heap (dont focus on measuring it too much)
#2 should give you an idea what is consuming the memory and thus
should give you a starting point.
By the way: top reports the amount of memory the VM has allocated and
the amount of physical memory consumed.
Due to Java heap dynamics this is only somewhat coupled to the actual
memory consumption of the VM.
But unless you start the VM with weird -X/-XX switches the memory
allocated / consumed should come down a while as the VM shrinks the
heap.
So if it's not doing this the app is not releasing the objects.
This is probably an application and not a Drools issue.
-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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] 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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