Did you check that all the DNS servers on the problem box are working
correctly. That can cause more performance issues that you can imagine.
Tim
Tim Rowe, [1]timmr@xxxxxxxxxx
Business Architect Application Development & Systems Management for IBM i
IBM i Development Lab, Rochester, MN
(507) 253-6191 (Tie) 553-6191
[2]
http://www-03.ibm.com/systems/power/software/i/are/index.html
-----"MIDRANGE-L" <[3]midrange-l-bounces@xxxxxxxxxxxx> wrote: -----
<midrange-l-bounces@xxxxxxxxxxxx>
message: 2
date: Thu, 02 Feb 2017 16:16:54 -0800
from: "James H. H. Lampert" <[4]jamesl@xxxxxxxxxxxxxxxxx>
subject: Re: Got a weird suggestion about a troublesome Tomcat
installation running in a subsystem
On 2/2/17, 12:02 PM, Buck Calabro wrote:
> When you measured the performance of the machine, did anything jump out?
What sort of performance metrics did you have in mind, that would be
specific to this situation?
Unfortunately, what I know about performance tools and metrics,
particularly relevant to this situation, and 50 cents, might buy you a
cup of very bad coffee. Or not.
Could somebody help me relieve my ignorance?
We've switched them to a version of the subsystem without the private
memory pool; response time hasn't changed significantly. Unfortunately,
without the private memory pool, WRKSYSSTS doesn't tell me how the stuff
running in the subsystem is doing on page faults, and so I don't know if
page faults are even a factor here.
The box that's got us scratching our heads on Tomcat/BIRT response time
has 4 type 31F3 4096M main storage cards, while another customer box
that's lightning fast with the same BIRT report running in Tomcat has 2
type 31E8 16384M main storage cards. Our own production box (also close
to lightning fast) has two 31A6 4096M main storage cards.
So the "problem" customer box (a Power 7, I'm told) has exactly twice as
much memory as our box (no more than a Power 6), and exactly half as
much memory as the lightning-fast customer box (a Power 8, I'm told).
Any idea what to try next?
--
JHHL
</midrange-l-bounces@xxxxxxxxxxxx>
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