Date: Wed, 29 Jul 2015 22:00:12 -0700 From: Doug Hardie <bc979@lafn.org> To: Chris H <bsd-lists@bsdforge.com> Cc: freebsd-stable@freebsd.org Subject: Re: Swap Usage Message-ID: <DE6B4BB1-7863-42E2-8EC9-EB4239CD7C91@lafn.org> In-Reply-To: <f4a3f3c22a83638087162328c5c8702b@ultimatedns.net> References: <BCA67F7E-676A-4226-83A0-84229948895E@lafn.org> <f4a3f3c22a83638087162328c5c8702b@ultimatedns.net>
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> On 29 July 2015, at 18:57, Chris H <bsd-lists@bsdforge.com> wrote: > > On Wed, 29 Jul 2015 17:41:33 -0700 Doug Hardie <bc979@lafn.org> wrote > >> I have several FreeBSD 9.3 systems that are using swap and I can’t figure >> out what is doing it. The key system has 6GB swap and currently it has over >> 2GB in use. ps shows only a kernel module [intr] with a W status. Obviously >> that isn’t using the space. No other process shows a W in its status. I >> suspect this is somewhat related to the use of mmap in one application. >> However, all of the mmaps in that application are file backed and thus >> shouldn’t use swap. How do I figure out what that swap space is being used >> for? > Maybe top(1)? > top -P > for example. At least you could see who's chewing all your memory. Which > should be a good clue as to who's responsible for swap usage. UFS although I don’t see how that could make a difference. Swap doesn’t use a regular file system. However, the kernel must track the actual usage using something like a simple file system. There must be a way to investigate it. Top doesn’t show anything unusual. The most VM used is by the process that uses a lot of mmap space that is all file backed. If it was another process that was partially swapped then the ps status should show a W. Only the one does.
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