RE: [JBoss-user] Performance gains using local interfaces in servlets

[Bill B. <bi...@jb...>]

This is because JBoss optimizes in-VM communication whether you're using
Local or Remote interfaces.  JBoss detects whether you are in-VM and does
the appropriate thing.

I hope all this Remote and Local crap is removed in 3.0.  There really is no
reason for it.

BTW, great work Jon!

Bill

> -----Original Message-----
> From: jbo...@li...
> [mailto:jbo...@li...]On Behalf Of Jon Barnett
> Sent: Saturday, June 21, 2003 12:30 PM
> To: jbo...@li...
> Subject: [JBoss-user] Performance gains using local interfaces in
> servlets
>
>
> We did some additional testing by tweaking web applications to use local
> interfaces to EJBs. These comparisons were made to our performance tests
> conducted earlier
> (http://www.amitysolutions.com.au/downloads/JBoss_optimizations.pdf)
>
> We found that they had little impact over the optimizations that JBoss
> performs internally. We saw perhaps a 1 ms decrease in the response time
> average, using the IBM SDK 1.4.0 with an optimized JBoss 3.2.0.
>
> In our test applications, we built the servlets so that they obtained
> references to EJBs only at initialization. So that nullified the
> PortableRemoteObject operation disadvantage. In a production system, you
> don't expect the references to change so we feel it is a reasonable
> performance tweak.
>
> Therefore, we were only measuring the speed improvement of passing by
> reference. With small amounts of data transferred between EJBs and
> servlets on a per transaction basis, the gain is small if not negligible
> from our results. If you were consistently transferring large blocks of
> data such as BLOBs for pictures, you might see more substantial
> performance gains. Images appeared to display faster when we inspected
> some pages incorporating BLOB derived pictures, although we would need to
> measure this to obtain a proper understanding of the gain.
>
> >From a memory perspective, we saw a 4Mb reduction in the virtual size
> (VSZ) and a 1.5Mb reduction in the resident in memory footprint (RSS)
> using the IBM SDK 1.4.0 with an optimized JBoss 3.2.0.
>
> Hope that is of use.
>