Re: using java for stored procedures (Thorbjoern Ravn Andersen)

[Pete Helgren <Pete@xxxxxxxxxx>]

Originally the JVM was 64bit but the Java team at IBM saw that there was 
performance gains that could be had by providing a 32bit version.  I 
think that it was first available in V5R4M0 (not sure).  If I remember 
correctly, some of the performance gains in the 32bit were then moved 
back into the 64bit version in V6R1M0 (IBM i 6.1).  I think, overall, 
the 32bit bit still outperforms the native 64bit one but the gap may be 
closing. At Common I have sat in on a couple of JVM optimization 
sessions given by Blair Wyman from IBM.  Great stuff, and the IBM Java 
team is top notch.

Pete


Mike Cunningham wrote:
> Hasn't the JVM always been 64-bit and the newer one is a 32-bit version?
>
> -----Original Message-----
> From: java400-l-bounces@xxxxxxxxxxxx [mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of Alan Campin
> Sent: Thursday, March 26, 2009 5:44 PM
> To: Java Programming on and around the iSeries / AS400
> Subject: Re: using java for stored procedures (Thorbjoern Ravn Andersen)
>
> Just curious. It was even that slow using the new 64-bit JVM running in PASE
> or that running the Classic JVM?
>
> The new JVM is supposed to be so much faster.
>
>
> On Thu, Mar 26, 2009 at 3:24 PM, Bruce Jin <brucej@xxxxxxxxxxxxxxxxxxxx>wrote:
>
>   
> > Our past experience seemed to suggest that Java stored procedures
> > implemented on AS400 could be very slow compared with SQL/RPG/CL
> > procedures.
> >  Our tests showed that it could be 10 - 50 times slower. We did tests on
> > tables with a few dozen records to a few dozen million records. Tested on
> > V6R1.
> >
> > It would be interesting to know if this is true on your box.
> >
> >  Bruce
> > --
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