RE: Alternate Platform for RPG -- RPG400-L

>Aaron, I'm not trying to be argumentative, but I suggest that you actually
do the timings before you state that Java is as fast as RPG.

Emphasis on "I have not done any sophisticated timing on this. . .";-)  The
applications that I was talking about were actually written in RPG first but
since we needed XML going in to the web service I decided to use Java.  The
Java Servlet that I wrote _IS_ as fast as the RPG CGI program without doing
any sophisticated testing.  There was no change in the amount of time it
took to process with the Servlet compared to the RPG program.  Does that say
something?...  IMO, yes.  If nobody notices that a process is running
slower, and it doesn't leave a big CPU footprint, then I would consider that
successful.

One thing that I should have noted is that my Java program was NOT doing any
file I/O but merely acting as a 'carrier' and parser of sorts, which is what
the RPG program was doing also (minus the parsing because it was just
reading HTML form field values).

Do you have any numbers for Java vs. RPG where I/O wasn't involved?  I would
like to see those because my main use for Java doesn't involve any Database
I/O.  Or at least I haven't found a use/need to do that yet.  Also, when
does the time come where you utilize new tools to make development simpler
at the expense of a couple CPU cycles?  Joe, I don't think you would argue
with me that doing _some_ things in Java is much easier than RPG, would you?

DISCLAIMER
I have not written, that I can remember, any production Java programs that
have done I/O because that is not what I see as Java's best attribute and
therefore I use it primarily to interface with our iSeries or provide 'web
services'.  I also dislike it when people post that something works just
fine when in all actuality they haven't done specific testing.  I felt I
relayed my message so that people would understand that the "fastness" of my
Java programs was completely related to my perception.

Sorry for any confusion but I am sticking to my guns:-)

Aaron Bartell

-----Original Message-----
From: Joe Pluta [mailto:joepluta@PlutaBrothers.com]
Sent: Tuesday, December 03, 2002 11:19 AM
To: rpg400-l@midrange.com
Subject: RE: Alternate Platform for RPG


> From: Bartell, Aaron L. (TC)
>
> The first
> call is going to be the only one that is slow and after that it
> performs as
> well as RPG.  I have not done any sophisticated timing on this, so it is
> based on human perception and not actual programmatical time-testing.

Aaron, I'm not trying to be argumentative, but I suggest that you actually
do the timings before you state that Java is as fast as RPG.  The last time
I did timings, Java was slower than RPG at pretty much everything, sometimes
considerably slower, especially in the area of transactional I/O.

I posted results to these lists based on real timings, using simple programs
like this:

FJ4PP1   O   E                    DISK
C           *ENTRY    PLIST
C                     PARM           COUNT  100
C                     PARM           TIME1   60
C                     PARM           TIME2   60
C*
C                     TIME           TIME1
C*
C                     DO   COUNT
C                     WRITEJ4PP1R
C                     ENDDO
C*
C                     TIME           TIME2

These programs need to be updated.  They were done in August of last year.
But they showed a considerable performance advantage to RPG native I/O to
both SQL and Java.  They should be run on other versions of the operating
system, and other versions of the JVM, and perhaps other OS configurations
for that matter.

Anybody interested in a joint project to extend this framework and run
additional tests, let me know.  This could be an interesting and informative
venture.

Joe

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