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MF55586 - LIC-OTHER-PERFM PERFORMANCE ISSUES DURING CHECKPOINT PROCESS

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


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Abstract

LIC-OTHER-PERFM PERFORMANCE ISSUES DURING CHECKPOINT PROCESS


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED      PTF/FIX  LEVEL

TYPE PROGRAM  REL  NUMBER   MIN/MAX  OPTION
---- -------- ---  -------  -------  ------
TR   5770999  710  MF99004   00/00    0000



NOTICE:
-------
Application of this PTF may disable or render ineffective programs that
use system memory addresses not generated by the IBM translator,
including programs that circumvent control technology designed to limit
interactive capacity to purchased levels.  This PTF may be a prerequisite
for future PTFs.  By applying this PTF you authorize and agree to the
foregoing.

This PTF is subject to the terms of the 'IBM License Agreement for Machine
Code', the terms of which were provided in a printed document that was
delivered with the machine.

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INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON INFRINGEMENT,
REGARDING THE PTF.





APAR Error Description / Circumvention

-----------------------------------------------
After applying a number of lic ptfs, including MF99004, there
has been a noticeable slowdown in the time it takes the system
to reach checkpoint processing during a save-while-actve backup.

CORRECTION FOR APAR MA42048 :
-----------------------------
A change was made to utilize an already existing function to
keep track of all locks in a thread. This was made to rediuce
the impact of jobs ending when no user or operating system
function unlocked before the thread was destroyed.



In this save scenario, this thread held 660,000 locks and the
management of this list proved to be more costly than wanted.



The number of locks represented in this list will be capped at a
high enough level to be useful in the terminating thread case,
but low enough not to impact these kinds of save operations.

CIRCUMVENTION FOR APAR MA42048 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


None.


Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
     NONE

Summary Information

System..............................i
Models..............................
Release.............................V7R1M0
Licensed Program...............5770999
APAR Fixed..........................View details for APAR MA42048
Superseded by:......................View fix details for PTF MF99011
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C2279710


System i Support

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Document Information

Modified date:
11 May 2012