------------------------<snip>-----------------------
Source : RMF Report
Earlier CPU Contention was around 99%.(when CPU Usage was 100%). Post
CPU Upgradation CPU Contention reduced to around 20%. However CPU Usage
is still hardlt 50% tht time ... what all factors contribute for CPU
Contention ?
Ideally speaking if CPU Usage is not 100% then there should not be CPU
Contention.
---------------------<unsnip>------------------------
On what part of that report do you base the conclusion that you HAVE CPU
contention?
Also, keep in mind that if multiple tasks become "In,Ready" at the same
instant, you may well have a contention situation, even if overall usage
is less than 100%. This might easily happen if an I/O operation is
fielded by interrupt, then other I/O ops are fielded via the TPI
instruction. The basic fact that CPU contention may occur isn't
necessarily bad; what's more important is how long a task has to wait
for CPU service, and how often. Both of these are much harder to measure
than the fact that 5 tasks might be waiting for service on any of 4
"engines" within the processor. And the very nature of the workload can
have a HUGE effect on all these issues. Not to mention your WLM settings.
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
