Re: JDBC performance issues after moving to Java 8

[Mark Murphy <jmarkmurphy@xxxxxxxxx>]

I'm not sure it's an issue with the pool it's in, we have 10Gb in *BASE,
and 42Gb in *INTERACT, and very low paging and faulting (0 in *MACHINE
pool, 10 in *BASE, 6 in *INTERACT) those are total numbers between DB and
Non-DB.

I have thought about using 64bit. We aren't running out of memory though
that I am aware of, and I was under the impression that using the 64bit JVM
is less performant unless you need it. Have changes been made to Java to
invalidate that?

On Fri, Jul 6, 2018 at 11:25 AM Jim Oberholtzer <midrangel@xxxxxxxxxxxxxxxxx>
wrote:

> Consider moving to the 64bit version.  I've had some success with
> improvements that way.  Depending on how memory intensive the application
> is
> you might have to add memory to the shared memory pool where it's running.
>
> Which brings up another point, you should be moving these processes into a
> shared memory pool and getting them out if *BASE.
>
> --
> Jim Oberholtzer
> Agile Technology Architects
>
>
> -----Original Message-----
> From: JAVA400-L [mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of Mark
> Murphy
> Sent: Friday, July 06, 2018 7:58 AM
> To: Java Programming on and around the IBM i <java400-l@xxxxxxxxxxxx>
> Subject: JDBC performance issues after moving to Java 8
>
> We have a Java application running on IBM i v7.1. It was working fine with
> Java 6, but when we moved to Java 8 in preparation for an upgrade to v7.3,
> the program started taking over an hour to run. As far as I know, the only
> change was to move to Java 8. We are using the 32 bit JVM for both Java 6
> and Java 8.
>
> Any ideas on where to look for issues? We are not getting any errors that I
> know of, and everything is running through properly. It just takes over an
> hour for the program to run now when it used to take minutes. The
> application is using JDBC to communicate with a MS SQL Server. It is
> basically synchronizing data for another process that runs on Windows.
> --
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