From owner-freebsd-questions@FreeBSD.ORG  Mon Jun 20 18:47:08 2005
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Date: Mon, 20 Jun 2005 14:47:00 -0400 (EDT)
From: Francisco Reyes <lists@natserv.com>
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To: Dan Nelson <dnelson@allantgroup.com>
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Cc: FreeBSD Questions List <questions@freebsd.org>
Subject: Re: When does swap decreases
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On Mon, 20 Jun 2005, Dan Nelson wrote:

> When the system is low on memory, it will force the least used blocks
> of memory to swap.  It will not free the swap space until the process
> owning them exits (even if it pages that memory back into RAM), so at
> some point the system paged out 30MB of memory, some processes exited
> and freed up 20MB, and you probably have some long-lived processes that
> account for that remaining 10MB.

Makes sense.
Any way to find out which process is using the swap?