RE: JDBC performance issues after moving to Java 8

I can't answer the changes to Java question, Tim would have to respond to
that.  My situation is experiential.  Assuming Networking (as Tim pointed
out) is not the issue, we've found some applications do run better in the
64bit version.    

Paging is clearly not an issue on your system. 


--
Jim Oberholtzer
Agile Technology Architects


-----Original Message-----
From: JAVA400-L [mailto:java400-l-bounces-Zwy7GipZuJhWk0Htik3J/[email protected]] On Behalf Of Mark
Murphy
Sent: Friday, July 06, 2018 11:47 AM
To: Java Programming on and around the IBM i <java400-l-Zwy7GipZuJhWk0Htik3J/[email protected]>
Subject: Re: JDBC performance issues after moving to Java 8

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-zbO79nAUJZvJTQUaaPvyeQC/[email protected]>
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-Zwy7GipZuJhWk0Htik3J/[email protected]] On Behalf Of 
> Mark Murphy
> Sent: Friday, July 06, 2018 7:58 AM
> To: Java Programming on and around the IBM i <java400-l-Zwy7GipZuJhWk0Htik3J/[email protected]>
> 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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