---------- Forwarded message ----------
From: Carruth, Rusty <Rusty.Carruth@smartm.com>
Date: Tue, Mar 1, 2016 at 10:26 AM
Subject: RE: swapiness
To: Main PLUG discussion list <plug-discuss@lists.phxlinux.org>
Cc: "bmike1@gmail.com" <bmike1@gmail.com>

Beware the sudo side effect! ;-)

When you type this:

Sudo cmd > file

The CMD is run as root, but the write to file is done as you!

You need to do this:

Sudo ‘cmd > file’

Or something like.

Also, don’t append to the file (don’t use >>), just overwrite (>).

Rusty

Again, only you will see this due to my IT department’s email rewriting rule that I haven’t spent the time to create a workaround for…)

A reply-all will, however, send to both me AND the list – which will be seen.

From: plug-discuss-bounces@lists.phxlinux.org [mailto:plug-discuss-bounces@lists.phxlinux.org] On Behalf Of Michael
Sent: Monday, February 29, 2016 11:10 PM
To: Main PLUG discussion list
Subject: Re: swapiness

fyi: when I attempted to save it in gedit it gave me the permission denied error.

On Tue, Mar 1, 2016 at 1:08 AM, Michael <bmike1@gmail.com> wrote:

What am i doing incorrectly?

$ sudo cat /proc/sys/vm/swappiness

bmike1@MikesBeast ~ $ sudo cat 30>> /proc/sys/vm/swappiness

bash: /proc/sys/vm/swappiness: Permission denied

bmike1@MikesBeast ~ $ sudo gedit

bmike1@MikesBeast ~ $ sudo gedit /proc/sys/vm/swappiness

** (gedit:10639): WARNING **: Hit unhandled case 13 (Error writing to file: Invalid argument) in parse_error.

bmike1@MikesBeast ~ $ sudo cat >> /proc/sys/vm/swappiness<<eof

> 1

> eof

bash: /proc/sys/vm/swappiness: Permission denied

bmike1@MikesBeast ~ $ sudo cat >> /proc/sys/vm/swappiness<<eof

eof

bmike1@MikesBeast ~ $ sudo cat /proc/sys/vm/swappiness

WHATEVER! lol

On Tue, Mar 1, 2016 at 12:43 AM, Michael <bmike1@gmail.com> wrote:

have a desktop. in any case I searched google this swapiness question and here is what it says:

After rebooting the swappiness is set to 10. This can be checked by

running the following command in a terminal: sudo cat /proc/sys/vm/swappiness.
The swap tendency can have a value of 0 (fully off) to 100 (swap is constantly used).
A workable and practical rule for changing the swappiness can be:
1 GB or more RAM: 10
Less than 1 GB of RAM: 1
Tip:
Your computer has less than 512 MB of RAM? Try to change the swap tendency to 0 (zero). With lower amount of memory installed, this might even give a better result then changing the swap tendency to 1.

Why is 0 better than 1?

On Tue, Mar 1, 2016 at 12:38 AM, Kevin Fries <kevin@fries-biro.com> wrote:

Linux is not Windows. Linux can, and will run without using swap if it can. Linux will remain RAM resident unless it has to. So, what they are telling you is this... If you don't need swap, don't define it.

There is one exception to this rule, since you are using a laptop. There are two instant on technologies, sleep and hibernate. One of the will stash the state to RAM, the other to swap. I forget which is which. But if it needs to go to swap, you will need a swap file equal to RAM if you use that feature.

Kevin

On Feb 29, 2016 10:32 PM, "Michael" <bmike1@gmail.com> wrote:

swapiness=..... 0? Remember; I am computer-illiterate!

On Mon, Feb 29, 2016 at 11:47 PM, Todd Millecam <tyggna@gmail.com> wrote:

Disable swap. Never activate it on boot. If you start reaching oom conditions, turn it back on.

On Mon, Feb 29, 2016 at 9:38 PM, Michael <bmike1@gmail.com> wrote:

What do you recommend you reduce swapiness to for machines that have plenty of memory that will probably never be filled?

--

:-)~MIKE~(-:

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Todd Millecam

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