[X4U] how to view "pageouts?"

[David Ledger]

At 07:04 -0700 19/6/08, x4u-request at listserver.themacintoshguy.com wrote:
>From: Ed Gould <edgould1948 at comcast.net>
>Subject: Re: [X4U] how to view "pageouts?"
>To: "A place to discuss Mac OS X for the casual user."
>	<x4u at listserver.themacintoshguy.com>
>Message-ID: <A52EE988-4471-4769-810D-B2E655E32950 at comcast.net>
>Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

>On Jun 18, 2008, at 12:22 AM, David Ledger wrote:
>>  Every pageout indicates that a process needs memory that isn't
>>  available. To get it that memory the system has to page out some
>>  other process's memory page. If it happens a lot you're short of RAM.
>
>Yes/no (agree and  disagree) Pageouts do *NOT* necessarily mean you
>are out of it (or not enough). There are other reasons not just short
>that can cause a page out (at least on systems I am aware of).
>Depending on the sophistication of the OS there are other reasons for
>page outs. Its hard to say with MAC os as very little is externalized
>(documented).

Other than memory mapped file I/O I'd be interested to know what 
these other reasons are.

David


-- 
David Ledger - Freelance Unix Sysadmin in the UK.
HP-UX specialist of hpUG technical user group (www.hpug.org.uk)
david.ledger at ivdcs.co.uk
www.ivdcs.co.uk