Oracle-Connection-Pooling in Java

[Benedikt Rothe]

Umberto

Thank you for taking care onon this old but still open issue!

I created 
http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1661 and
http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1662

Benedikt

(Sorry! I was not able to add your e-mail-adress to cc. Bugzilla denied to 
do so. I suppose
you can handle this anyway.)

Umberto Nicoletti <umberto.nicoletti at gmail.com> schrieb am 13.02.2006 
10:25:02:

> Benedikt,
> since I am looking this issue would'n t you mind opening a bug for the
> inclusion of msConnPoolCloseUnreferenced in mapscript and one for the
> memory leaks (add me to the cc list)?
> 
> 
> Reagrds,
> Umberto
> 
> On 1/2/06, Benedikt Rothe <umn-ms at hydrotec.de> wrote:
> >
> > Hi list members,
> >
> > From former threads I got the impression, that there are some folks
> > interested in the Oracle/Mapserver/Java/Tomcat.
> >
> > Therfore I'd like to share experiences I made with using 
Connection-Pooling
> > of
> > Oracle-Connections inside Java/Tomcat.
> >
> > Testenvironment: Mapserver 4.6.2; Suse-Linux; Tomcat 4.1.31; Sun-Java 
1.4.2
> > Simulating 5 Browsers, which produce maps, query features, make 
selections,
> > query-legend-pics frequently.
> >
> > - After using synchronized "enough" I didn't have crashes of Tomcat.
> >
> > - Big memory leak: Between the first 5 requests and the next 100 
requests
> >    the Tomcat-process became about 400MB bigger.  (I use "top" for
> >    watching memory-footprint.)
> >
> > - Cleaning the Connection-Pool "by hand". This means:
> >   Opening the function msConnPoolCloseUnreferenced in mappool.c
> >   for use in Java and call it after every request.
> >
> > - After this I still have memory leaks:  About 100MB for 30.000 
requests.
> >   (I also made a test: 25.000 requests without Connection pooling. 
Memory
> > increased
> >     and decreased as expected  in this case.)
> >
> > - Performancecomparison in my testcase:
> >   Without use of connection-pooling: ~ 50 Request per minute
> >   With use of connection-pooling: ~75 Request per minute
> >
> >
> > As a result I have the following encouragements:
> > - Making msConnPoolCloseUnreferenced  availabe for mapscript via swig.
> >   (I made a hack by directly editing mapscript/java/mapscript_wrap.c 
and
> >    Java-Files in mapscript/java/edu/umn/gis/mapscript.) I
> > think this
> >   function could be part of the mapscript-Object?
> >
> > - Investigations on the memory leaks. Both leaks shouldn't occure. 
(I'll do
> >   this, if I find time. but ...)
> >
> > - Fernando Simon: What about using OCI-Connection-Pooling  for oracle
> > instead the mappool.c?
> >
> > 
http://oraclesvca2.oracle.com/docs/cd/B14117_01/appdev.101/b10779/oci09adv.htm#452244
> >   (If you don't have time, I maybe could help coding. But would it 
become
> > part uf Mapserver?)
> >
> > Happy new year to everybody
> > Benedikt Rothe
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