Re: Java peformance taking a dip going from RHEL 5 -> RHEL 6 ?

From:

Nigel Wade <nmw@ion.le.ac.uk>

Newsgroups:

comp.lang.java.help

Date:

Wed, 26 Feb 2014 13:46:58 +0000

Message-ID:

<bn69iiFoie9U1@mid.individual.net>

On 25/02/14 14:30, Steve wrote:

Hi. I'm at an org working on an SWT application compiled in Java 1.6 and we use Eclipse 3.8. We could have Eclipse
up and the app up, having evertying run at OK speeds on a 32 bit version of RHEL 5.1. We upgraded to RHEL 6.5, 64
bit, keeping the same hardware. Now the speeds are making our setups almost unusable.

Firstly, SWT is not part of Java. So it may not be Java that's your problem.

Have you ascertained exactly where in your code the delay is being caused? Is it in CPU performance, disk I/O or
graphics (SWT library)?

Anyone else have this experience?

No.

Any ideas what could be causing it?

Something not optimized correctly for the hardware. I'd look at whether the SWT and/or your graphics driver are
optimized for your hardware. Does SWT use OpenGL, have you setup the correct X driver, and OpenGL configuration?

Any ideas for a cure aside more RAM?

I can't think why more RAM would help.

--
Nigel Wade