Re: WO and Memory Management
Re: WO and Memory Management
- Subject: Re: WO and Memory Management
- From: Owen McKerrow <email@hidden>
- Date: Fri, 14 Jul 2006 12:33:15 +1000
Thanks for the response Chuck. See comments below....
On 14/07/2006, at 11:53 AM, Chuck Hill wrote:
On Jul 13, 2006, at 6:15 PM, Owen McKerrow wrote:
Hi All,
We are setting up an application of ours on a clients server, they
did some stress testing to see if they needed a bigger box and
discovered something strange.
Their comments ....
The webobjects versions have been stress tested further, we are
getting ok
results but far worse then I was hoping. RIS Public faired worse
the RIS
with it starting to get error with only 5 simultaneous users
making simple
request 5 seconds apart (running with 2 instances each with -mx512M.
That is odd. Are you dispatching requests concurrently?
No, getting them to retest with it on.
A major point of interest is that garbage collection does not
appear to be
active for these instances.
Check for I/O and DB usage. How long does the average request
take to process?
From the stats page :
Transactions 691
Active Session 0
Average transactions 5.031
Averegae idle 131.627
We ran the tests yesterday and the started to
consume over 500M per instance (2 instance running for RIS and
RISPublic).
This morning after no activity all night the process are still
using the
full memory set. To me this is a bit of a concern, can you guys
check your
side to see if it the same there, or if there is some
configuration options
that can be put in place to improve this?
The strange thing here is that the instances don't seem to be
releasing memory. Is this normal ? Is there a setting I need to
tweak somewhere in JavaMonitor ?
This is normal for the JVM on OS X. Once the JVM has allocated
memory, it does not return it to the OS until it terminates. You
can have the instances restart more often to return this memory to
the OS. 500M seems like a lot, but that depends on what the app is
doing.
Sorry forgot to mention its on a Solaris Machine running Vs 9. WO
5.2.4 ( witha 5.3 build if it makes any difference ).
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