Re: AS/400 and Java

["Mike Silvers" <msilvers@xxxxxxxxxxx>]

What problems do you see with optimization level of 40?  I use that all the
time with no problems on V5R1 and V5R2.....

Mike

----- Original Message -----
From: <Dieter.Bender@t-online.de>
To: <java400-l@midrange.com>
Sent: Monday, November 04, 2002 9:53 AM
Subject: Re: AS/400 and Java


> Scott,
>
> Performance Capabilities Reference says that CRTJVAPGM is only faster
> than JIT with level 40 and I would not use 40, this could cause
> problems. Besides this the static compiled classes are only used by the
> system class loader; application containers often use class loaders of
> its own, wich don't care about all the CRTJVAPGM.
>
> Dieter
>
> Scott Johnson schrieb:
> >
> > 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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