Using 11.2.0.2 on Centos 5.4 x86_64, I get that entry all the time as top ADDM finding with 100% impact, whatever that means:
"Significant virtual memory paging was detected on the host operating system"
I'm unable to identify (eg with top) a process that could create significant swapping, or even consume any significant amount of memory. The box has 50G of RAM, 40G being allocated to the DB, managed using Automatic Memory Management. Current system state:
%free -m
total used free shared buffers cached
Mem: 52335 40957 11377 0 1383 27084
-/+ buffers/cache: 12489 39845
Swap: 32767 7689 25078
%vmstat
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
3 0 7875588 11631444 1416968 27729992 0 0 26 45 1 0 2 1 97 0 0
The "Pages Paged-out" metric indeed shows a few peaks at about 2000 pages per sec sometimes, but they are few and far between; moreover I'm unable to associate them with any particular cause.
Any idea what could be the cause, or how to indestigate this further?
Your help would be appreciated.
Chris