Re: AS/400 and Java

[Dieter.Bender@xxxxxxxxxxx]

Mike,

Mike Silvers schrieb:
> Dieter,
>
> Do not use CRTJVAPGM???  When a Java program is run, the
> system
> automatically does the CRTJVAPGM if one has not been done
> before.  I think
> that you should look at the command defaults and adjust
> them accordingly to
> get the best performance in the CRTJVAPGM command...

this has changed with V4R5, by default the system uses the new JIT
environment!!!
>
> Do not mix Java with RPG or COBOL????  Performance
> depends on the method of
> interaction.  I think such a blanket statement is
> overstated.  I agree that
> direct program calls are expensive, but other methods
> (such as Socket/XML
> processing) do not significantly degrade the performance.
>  I have found that
> it is faster to use a socket to communicate with an RPG
> program and do
> database access than using JDBC with Java.

Why do you use jave, when you do such work arounds to get it fast. BTW,
if ibm won't succeed to get jdbc faster than this socket things, the
as400 will disappear and your applications too. The afford to do this
programming stuff by your own is not in any relation to the performance
benefits. Buying more hardware to get the engine flying would be
cheaper.

Dieter
>
> Mike
>
>
> ----- Original Message -----
> From: "Scott Johnson" <sjohnson@highsmith.com>
> To: <java400-l@midrange.com>
> Sent: Monday, November 04, 2002 9:39 AM
> Subject: Re: AS/400 and Java
>
>
> >
> > Dieter,
> >
> > In reference to number 2, are you saying to NOT use
> CRTJVAPGM on a V5R1 or
> > V5R2 box? Can you please tell me why?
> >
> > Thanks,
> >    Scott P. Johnson
> >
> > > To: java400-l@midrange.com
> > > Subject: Re: AS/400 and Java
> > > From: Dieter.Bender@t-online.de
> > > Date: Mon, 04 Nov 2002 11:49:38 +0100 (CET)
> > > Reply-To: java400-l@midrange.com
> > >
> > > Hi,
> > >
> > > and here my performance tips:
> > >
> > > 1. read the recent manuals (Performance Capabilities
> Reference
> > > recommends the JIT environment since V4R5!)
> > > 2. don't use CRTJVAPGM on boxes > V4R5
> > > 3. don't use the native driver, its buggy, use the
> latest Toolbox
> > > driver
> > > 4. don't use record level access (more IO Operations
> compared to SQL)
> > > 5. run your application server on inexpensive boxes
> (Wintel, or Linux
> > > on Intel), if possible (scalability)
> > > 6. Don't mix Java with RPG and/or COBOL, the context
> change is very
> > > expensive
> > > 7. use all features of the as400 as database server,
> you've paid for
> > > it
> > > 8. for maximal speed with minimal hardware
> requirements use assembler
> > > and shift your bytes bit by bit
> > >
> > > Dieter
> >
> > _______________________________________________
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> >
>
>
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