intr using Swap
dweimer at dweimer.net
Wed Feb 17 18:51:46 UTC 2016
On 2016-02-17 11:36 am, Efraín Déctor wrote:
> This past few days, on a dedicated server I'm seeing that swap space
> is being used while there are plenty of RAM to be used:
> Mem: 14G Active, 39G Inact, 7723M Wired, 504M Cache, 1864M Buf, 593M
> Swap: 8192M Total, 1567M Used, 6625M Free, 19% Inuse, 108K In
> After investigating, I swa that the process using swap is intr:
> Result of ps ax | grep W:
> 12 - WL 937:48.07 [intr]
> uname -a:
> FreeBSD edh.hyrule.mx 10.1-RELEASE-p24 FreeBSD 10.1-RELEASE-p24 #0:
> Mon Nov 2 12:17:28 UTC 2015
> root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64
> Is there any reason for intr to be using swap space? Is this normal?
I believe you are incorrectly reading it, the first character of the
state line being a W Marks an idle interrupt thread, W only means
swapped out if its an additional character in the section.
state The state is given by a sequence of characters, for example,
``RWNA''. The first character indicates the run state of
W Marks an idle interrupt thread.
Additional characters after these, if any, indicate
W The process is swapped out.
Even when there is available memory if an item has already been swapped
it wont return to physical memory until the process needs access that
memory. Its not uncommon to see systems that had a brief memory
constraint leave some swap long after the memory has been cleared up.
Dean E. Weimer
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