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
System z Performance and Availability Management
mailto:[EMAIL PROTECTED]
(office) 301.986.3574
"Think big, act bold, start simple, grow fast..."
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Longnecker, Dennis
Sent: Friday, June 27, 2008 12:38 PM
To: IBM-MAIN@BAMA.UA.EDU
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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