To swap or not to swap ;-) (was RE: To lvm or not to lvm)

[Stephen Partington]

YEah, So I always consider installing at least a GB or two for swap and
setting swappiness to 0 for that. It also might explain why Mr Butash still
can see a difference in performance on what he does when swap is there or
not.

On Mon, Sep 24, 2018 at 9:44 AM Carruth, Rusty <Rusty.Carruth at smartm.com>
wrote:

> Wow, that quote is very interesting.
>
>
>
> Thanks!
>
>
>
> (google found the reference for me.  One of them (possibly the original
> reference others are using) is
> https://www.kernel.org/doc/gorman/html/understand/understand014.html )
>
>
>
> I read it, and it appears that the reference is talking primarily about
> what the kernel does.  I kept searching and couldn’t find any definitive
> statement that a PROGRAM could request this, however apparently some JVM
> somewhere can do something with memory that almost requires there be swap
> to keep the JVM from getting killed by the OOM monster…  er, killer… er,
> task.. er, whatever.
>
>
>
>
>
> Rusty
>
>
>
> *From:* PLUG-discuss [mailto:plug-discuss-bounces at lists.phxlinux.org] *On
> Behalf Of *Stephen Partington
> *Sent:* Sunday, September 23, 2018 12:18 AM
> *To:* Main PLUG discussion list
> *Subject:* Re: To swap or not to swap ;-) (was RE: To lvm or not to lvm)
>
>
>
> I have found some applications use swap with direct calls.
>
>
>
> "A significant number of the pages referenced by a process early in its
> life may only be used for initialisation and then never used again. It is
> better to swap out those pages and create more disk buffers than leave them
> resident and unused."
>
>
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-- 
A mouse trap, placed on top of your alarm clock, will prevent you from
rolling over and going back to sleep after you hit the snooze button.

Stephen
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