brent saner on 10 Jul 2015 15:23:06 -0700


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Re: [PLUG] swappiness and ssd

(sorry for top-posting; on mobile)

yes, you can echo redirect to change runtime swappiness (or anything else, for the most part- there are a few exceptions- in /proc and /sys).

sysctl's -w flag does this also.

set it in /etc/sysctl.conf (your distro may use something different, depending how new the kernel is, if it uses systemd vs sysvinit-style, etc.) to make it persistent across reboots.

On Fri, Jul 10, 2015, 18:16 Keith C. Perry <kperry@daotechnologies.com> wrote:

I know how to get usage but I didn't realize "swappiness" was a thing you could look up in proc.  That's pretty cool...

Even though, I leave swap off  :D

BTW, my swappiness still says 60- that's interesting.  Maybe that's actually control point too?  Can you do...

echo 80 > cat /proc/sys/vm/swappiness

?

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
Keith C. Perry, MS E.E.
Owner, DAO Technologies LLC
(O) +1.215.525.4165 x2033
(M) +1.215.432.5167
www.daotechnologies.com

----- Original Message -----
From: "brent timothy saner" <brent.saner@gmail.com>
To: plug@lists.phillylinux.org
Sent: Friday, July 10, 2015 6:10:54 PM
Subject: Re: [PLUG] swappiness and ssd

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On 07/10/2015 06:04 PM, Keith C. Perry wrote:
> Thanks for the update K.S..
>
> To be complete can you tell us how you measured your "swappiness"?
>

Not sure how he does it, but I do it via these:

cat /proc/sys/vm/swappiness will give current value.

(or sysctl vm.swappiness)

To test/monitor,

free | egrep '^Swap:'
will show usage.

If you want something more in-depth, vmstat(8).
(If you want the shell to spit out vmem usage every 1s, do "vmstat 1")
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