Re: 10046, Unaccounted for Time, Aix 5.3 -- How to Determine Process Pre-Emption

  • From: John Kanagaraj <john.kanagaraj@xxxxxxxxx>
  • To: elkinsl <elkinsl@xxxxxxxxx>
  • Date: Wed, 2 Dec 2009 17:45:00 -0800

Hi Larry,

> What is being looked for by the “SA’s” is something along the lines of
> strace, truss, ptrace, trace, whatever, and how those could be used by the
> SA’s to see if pre-emption is occurring. They aren’t sure of the best
> way/tool to use, and I don’t have a recommendation for them, though plenty
> of examples, especially tied into Oracle, for flavors other than AiX.

Did the SAs look at sar and vmstat? I don't have access to AIX to see
the various options, but I ask because vmstat/sar -quw should show CPU
queue lengths, CPU usage and Context switches (among the many other
columns) which should give them a fair indication of the *extent* (but
not specifics) of the issue. For specifics, you might want to look at
the various PRI (priority) values for selected processes to understand
if there are some processes that are getting a priority that they
should not be getting :) Again, there may be AIX specifics, the way
LPARs are created/configured, etc., which the SAs will have to
consider in view of this data.....

John Kanagaraj <>< (Sorry - not an Oracle blog!)
** The opinions and facts contained in this message are entirely mine
and do not reflect those of my employer or customers **

Other related posts: