Andrus, when you say "multi user app", are you assuming a DataContext
created like this?:
// assume this exists
HttpSession session;
DataContext context =
BasicServletConfiguration.getDefaultContext(session);
or this?:
DataContext context = DataContext.getThreadDataContext();
I'm just making sure I'm understanding you correctly.
Thanks!
Jonathan
>>> andru..bjectstyle.org 2005-06-22 2:13:07 PM >>>
Paul,
Cache settings have effect on the shared cache in a multiuser app. For
a
single session DataContext (or rather its ObjectStore) has no upper
limit
on the number of cached objects as it is designed to have a shorter
life
span.
So a more realistic performance test would actually discard a
DataContext
and create a new one after a few operations (how many is "few" depends
on
your expected usage patterns).
FYI: Here is the stack structure (default is level 2):
http://objectstyle.org/cayenne/userguide/design/caching.html
Andrus
> Hi Andrus,
>
> I'm seeing behaviour in my app using Cayenne, where it runs slower
and
> slower
> the longer the application runs without a restart. I suspect that it
will
> eventually run out of memory. Upon restart, performance starts out
high
> again.
>
> I wrote a very simple test application to rule out any of my custom
code.
> It
> simply registers a new objects with the DataContext, sets a property,
and
> calls commitChanges. The test app prints out the elapsed time for
every
> 1000
> iterations. The results are here:
>
> http://www.buzzsurf.com/java/cayenne/results.txt
>
> If you want to run the simple test application yourself, it's here:
>
> http://www.buzzsurf.com/java/cayenne/CayennePerfTest.zip
>
> As you can see, performance degrades linearly over time. It seems
like
> DataContext is caching a pointer to every object created, despite my
cache
> settings?? I've been playing with the "Max Number of Objects"
setting in
> the
> Modeler, but different settings seem to have no effect.
>
> -Paul
>
>
>
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email
______________________________________________________________________
______________________________________________________________________
This email and any files transmitted with it are confidential and
intended solely for the use of the individual or entity to whom they
are addressed. If you have received this email in error please notify
the system manager.
Katun Corporation -- www.katun.com
_____________________________________________________________________
This archive was generated by hypermail 2.0.0 : Wed Jun 22 2005 - 15:49:06 EDT