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

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