Oracle-Connection-Pooling in Java

[Umberto Nicoletti]

On 2/13/06, umn-ms at hydrotec.de <umn-ms at hydrotec.de> wrote:
>
> 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.)

I just did. I will send you a patch for the
msConnPoolCloseUnreferenced function asap o that you can test it.

Regards,
Umberto

>
> 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
>