RE: Does jBoss work on iSeries?

["Joe Pluta" <joepluta@xxxxxxxxxxxxxxxxx>]

> From: David Morris
> 
> Java can run at near the speed of RPG. It really depends on where the
> bottleneck is. For example, using EJBs to do aggregation over large
data
> sets will perform poorly compared to RPG -- likely 20X's more
> CPU/memory. Java using SQL aggregation to objects will be close enough
> to the same performance and probably OK -- likely 5X's more
CPU/memory.
> Java using SQL aggregation to process that same data without
persistent
> objects will be very close to RPG -- likely 2X's more CPU/memory.

Actually, I don't consider aggregation to be the primary work of a
business application.  As I understand it, aggregation is queries, and
you're right, queries can be cleaned up by moving more and more of the
request to the SQL engine.  I am a little unclear on how you use SQL
aggregation over non-persistent data.  Where is this data stored?  How
does the SQL engine get at it?  Are you basically caching tables in
memory and letting SQL run through it?  In that case, it had BETTER be
fast.

Anyway, from an application standpoint, it's still been the case that
real world enterprise-level business logic (the kind of thing where the
logic flow is determined by database switches) is best served by RPG.
SQL, regardless of the flavor, doesn't cut it in an environment where
you need to check different entities for condition flags, which is the
meat and potatoes of any sort of business application.


> Java
> to call RPG still has to convert the RPG result to Objects, which has
> some overhead over pure RPG -- likely 1.5X's more CPU/Memory.

In a proper design, the primary overhead is in translation to output
Strings.  I suppose if that 50% becomes a problem, you can use the
%editc BIF to edit your numeric data and then iconv() API to perform
your String translation (that will reduce a lot of your CPU
requirements).

Joe