freebsd stable - Feb 2018 - 50 percent swap used, but "ps auxww" output shows no processes swapped out

Hi all,

I've got an amd64 system running 11.1-STABLE r325027, with something
like 20G of swap. "swapinfo" shows that half the swap is used.

So of course I'm curious to know which processes have been swapped
out. I'm not using any "tmpfs" filesystems; no ZFS, no huge
amounts of
wired-down memory. The system's got 16 processors and 128G of RAM. "ps
auxww" output shows *no* processes that are swapped out (2nd character
in "STAT" field is "W"). Not a single one. The only process
with a W in
the stat field at all is the "[intr]" kernel thread.

What is using the swapspace?

Please educate me.

Thanks,

--MCV.

Swapping whole processes out is not really a thing any more. Individual
pages are paged to/from memory; if a memory page has no backing file, it
will be allocated a block in swap space as its backing storage.

(I'm not sure "W" status even means swap; I thought whole-process
swapping
wasn't even supported any more.)

On Sat, Feb 3, 2018 at 4:14 PM, Michael Voorhis <mvoorhis at mcvau.net>
wrote:
> Hi all,
>
> I've got an amd64 system running 11.1-STABLE r325027, with something
> like 20G of swap. "swapinfo" shows that half the swap is used.
>
> So of course I'm curious to know which processes have been swapped
> out. I'm not using any "tmpfs" filesystems; no ZFS, no huge
amounts of
> wired-down memory. The system's got 16 processors and 128G of RAM.
"ps
> auxww" output shows *no* processes that are swapped out (2nd character
> in "STAT" field is "W"). Not a single one. The only
process with a W in
> the stat field at all is the "[intr]" kernel thread.
>
> What is using the swapspace?
>
> Please educate me.
>
> Thanks,
>
> --MCV.
> _______________________________________________
> freebsd-stable at freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-stable
> To unsubscribe, send any mail to "freebsd-stable-unsubscribe at
freebsd.org"
>


-- 
brandon s allbery kf8nh                               sine nomine associates
allbery.b at gmail.com                                  ballbery at
sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net

04.02.2018 4:14, Michael Voorhis wrote:
> I've got an amd64 system running 11.1-STABLE r325027, with something
> like 20G of swap. "swapinfo" shows that half the swap is used.
> 
> So of course I'm curious to know which processes have been swapped
> out. I'm not using any "tmpfs" filesystems; no ZFS, no huge
amounts of
> wired-down memory. The system's got 16 processors and 128G of RAM.
"ps
> auxww" output shows *no* processes that are swapped out (2nd character
> in "STAT" field is "W"). Not a single one. The only
process with a W in
> the stat field at all is the "[intr]" kernel thread.
> 
> What is using the swapspace?
These 10G may be just several pages of several processes.
Please show output of "top -ores -d1".