Re: [PLUG] swappiness and ssd

[Anthony Martin <anthony.j.martin142@gmail.com>]

We had a discussion about this on the G+ page. There really isn't a need for a large amount of swap in most cases nowadays since we have so much physical ram. Also as both Rich and Rich said the small performance increase you would get isn't really worth the damage to you SSD.

Anthony Martin

Jr Linux System Administrator

(M) 609-410-1168
anthony.j.martin142@gmail.com

On Thu, Apr 16, 2015 at 10:21 AM, Rich Mingin (PLUG) <plug@frags.us> wrote:

Rich Prime beat me to it.

Increase swappiness for a small increase in performance and a variable to large amount of write wear on the SSD.

Reduce swappiness to minimum for a small potential decrease in performance (depends on available memory), but minimizes wear on the SSD.

On Thu, Apr 16, 2015 at 10:19 AM, Rich Freeman <r-plug@thefreemanclan.net> wrote:

On Thu, Apr 16, 2015 at 10:01 AM, K.S. Bhaskar <bhaskar@bhaskars.com> wrote:
> The default swappiness on Ubuntu systems is 60, and presumably takes into
> consideration the relative performance of writes to and reads from the swap
> file / partition.  The ratio of write performance to read performance would
> be higher for SSDs than rotating media, since SSD reads are truly random
> whereas writes are in pages (in rotating media, seek and latency times would
> tend to apply to both).  Therefore, it seems to me that if swap is located
> on SSD, we should increase swappiness, to encourage less frequently used
> pages to be written out, since they can be brought back in very fast when
> needed.  Does that seem reasonable or am I missing something?  Thanks.

That completely makes sense, though keep in mind that swap on SSD is
likely to increase wear.

--
Rich
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___________________________________________________________________________
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