FWIW, I have seen a UniVerse process jump from one CPU to another on a
dual-CPU box running NT 4. It was a big process and we were logging
system monitors to identify bottlenecks -- Rich Taylor might (or might
not, as it was years ago) remember helping us with our investigation.
A quick search shows how to set processor affinity permanently for an
application if the opposite behavior is desired:
http://searchwin2000.techtarget.com/tip/1,289483,sid1_gci778853,00.html
Date: Tue, 25 Oct 2005 19:48:31 -0500
From: "David Wolverton" <[EMAIL PROTECTED]>
Subject: RE: [U2] UniData and multi-core chips.
For Windows the processes float? Interesting!! I was just reporting what
we were told eons ago -- that Processes were bound to a CPU on on startup on
a Windows MultiProcessor... If that's not the case, even better ...
Information in this area is hard to come by -- any authoritative information
is welcome!! Where can we find more information on this?
"When you start up, in the case of a dual/quad-processor, my understanding
is that process is 'bound' to whatever CPU the OS kicked it off on... So, in
theory, you do get some advantage of multiple processors, but the load is
not dynamically balanced based on usage.
....
This is NOT how it works. The OS is able to start a process on a particular
CPU and then can move the process on to other CPU's as it sees fit, to
manage the load. E.g. does dynamically balance based on usage. There are OS
commands to "bind" processes to CPUs, but these should not normally
required, you are best to leave it up to the OS!
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