Re: zAAP engine Benefit Question

And Redbook authors really only know/write about the facts they know from
doing the effort they set out to do, they are not updated as time goes on to
be living documents. Some Redbooks get updates if the authors are till around
and have the time, but not advances in general. So there may be other things
that can use a zAAP these days that will not get retrofitted into the Redbook.
IBM is allowed to authorize other users to take advantage of the zAAP and
zIIP.

You should try and contact an author of the Redbook to ask what they mean
if you want the best answer. They may not subscribe to IBM-MAIN, but often
list a way to contact them in the Redbook. While I could make the assumption
something in the IP stack uses JAVA, the developers are the ones who really
know.

On Fri, 27 Jun 2008 12:52:09 -0400, Knutson, Sam <SKnutson@xxxxxxxxx>
wrote:

Hi Dennis,

I think the author is talking about the benefit of running the Websphere
J2EE stack local on z/OS rather than off platform. You save by not
having to talk to a web server/app server across the LAN or WAN that is
on another box maybe traverse a firewall or two instead you go directly
from some z/OS transaction manager to Websphere on z/OS. At worst case
hopefully between LPARs in the same CEC.

zIIP engines however are enabled for much more than Java and priced the
same as zAAP engines.

Best Regards,

Sam Knutson, GEICO

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@xxxxxxxxxxx] On
Behalf Of Longnecker, Dennis
Sent: Friday, June 27, 2008 12:38 PM
To: IBM-MAIN@xxxxxxxxxxx
Subject: zAAP engine Benefit Question

In the March 2008 Redbook title "System Programmer's Guide to: Workload
Manager" it has a section that reads:

----
3.6.3 zSeries Application Assist Processor (zAAP)

The benefits of using a zAAP processor to execute Java code are saving
CPU cycles in IP stacks and in the firewalls due to the connectivity
simplification.
----

I understand the JVM is the only authorized zAAP user. Does the above
part from the manual imply that the IP stack and firewalls are written
in JAVA, thus the CPU savings? And, what is the connectivity
simplification being referenced?

Thanks, Dennis


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