Charles,
I have tuned the heap size based on what is ideal during peak hours.  The
problem is that off-hours usage is very different, and leads to these very
long full GCs.  

Does it sound like an application problem?  I have not done any analysis to
determine what kind of objects are hanging around.  This is a third party
application, so there is really not much we can do on that front anyway.

Again, unfortunately upgrading is not an option for us at this point.

Thanks,
-Bill


Caldarale, Charles R wrote:
> 
>> From: David Delbecq [mailto:[EMAIL PROTECTED] 
>> Subject: Re: Very Long Full GC after Inactivity
>> 
>> check the jvm runs in "server" mode (check there is a '-server'
>> parameter given to jvm startup). Server and client mode have different
>> GC mecanisms.
> 
> That's not correct; the set of GC algorithms available for server and
> client are identical, but the default heap sizes are different.
> 
> For initial problem analysis, turn on -verbose:gc if you haven't
> already, and use JConsole to look at the heap usage.  You may need a
> profiler to find out just what objects are hanging around and causing
> the long pause.
> 
> You might want to try running with a later JVM - a 1.5 or 6 version
> should give you reduced pause times as well as better performance
> overall.
> 
>  - Chuck
> 
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