Single Threaded Application and ps -o thread command output

Guys,

I have Two instances of a single threaded application running on my AIX
5L server . I have varified that it is a single threaded application
using svmon -p command. Now the situation is that when i run " ps -o
THREAD -u commuser " then according to ps command manuals BND column
should return either 0 or 1 ( as it is a single threaded application so
either it should run on processor 0 or 1 ) but in my case BND column is
not shown ( only - is showing in BND column ; which means that all
application threads are not running on same processor )

How come it is possible that a single threaded application' thread is
logically divided to be able to run on two processors ( rather than
running on same processor )???

Please advice !! Am i wrong in my understanding??? Also please note
that whenever

Your thread can run on any proc you have on your system .. you have
something called processor affinity which tries to keep the threads on
the same proc as this aides perf in the long run, but once your thread
becomes runable the scheduler will work out what threads are runnable
and already scheduled to run on which run queue and at what priority
and then it will make a decision which run queue to place your thread
... this may or may not be the same cpu run queue as before.

So, unless you actually bind that proc to a processor (bindprocessor
subrouting / command) then its free to go to any proc ..

HTH
Mark Taylor