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From Steven Githens <swgit...@mtu.edu>
Subject Re: CacheManager slowing performance
Date Fri, 30 Nov 2007 07:09:17 GMT

Thomas Mueller wrote:
> Hi
> Do you mean that Jackrabbit prints the 'resizeAll' line, and then
> nothing else for a minute? Don't just blame the most frequent / last
> entry in the log file ;-) I suggest to use a profiler, for example the
> YourKit Java Profiler, if possible.
I'll definately put in some more YourKit time.  You're right, it was 
just hanging on something in the Cluster package, before I removed it.  
Just wondering if there was something obvious I was doing wrong.
>> Is there a penalty for rapidly opening and closing sessions?
> Yes, it is slow. Opening connections (database or Jackrabbit) is quite
> slow. Don't do it if you don't need it.
Ok.  In the past (it was on 1.3.1 or earlier) when I've ran tried to 
really ramp things up, I actually started running out of file handles 
and getting POSIX'ish sorts of errors.  (usually I'm running some sort 
of Linux distro).  Granted, this is a different scenerio. 

Given a huge set of files to convert, I'm just not sure at the moment 
how many things I should do at a time before retiring the session.
> Maybe you should think about using a different persistence manager.
> What do you use now? See
> http://wiki.apache.org/jackrabbit/PersistenceManagerFAQ for details.
> Regards,
> Thomas
We've been just using the SimpleDbPersistenceManager, but I did start 
looking into the BundlePersistenceManager today.  I've yet to look at 
the DataStore stuff, or get the extra code for it, but am hoping to try 
it as soon as I get a chance.


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