Re: Swap

Could you please give your suggestion for my questions (based on SSD) ?
On 05-Feb-2016 11:59 AM, "Jos Collin" <[email protected]> wrote:

> I have 120GB HDD with 3.8GB swap at the moment. I have monitored the swap
> usage for sometime, running frequently used applications and then
> hibernate. It uses around 175MB even after hibernation. My new SSD is 120GB
> and I'm having 4GB RAM now. So as per the discussion with you, I'm planning
> to have a swap space of 5 - 6 GB (considering the worst case). I have the
> following questions:
>
> 1. Will the use of swap file instead of a swap partition affect
> performance ? I feel that if it was a swap file, I can change the size of
> it anytime I want and it is easier.
> 2. Allocating swap in an SSD is a bad idea ? Some people says it affects
> the life of the SSD. Please see the following urls.
>
> http://askubuntu.com/questions/652337/why-no-swap-partitions-on-ssd-drives
> http://www.makeuseof.com/tag/optimize-linux-ssds/
>
> Please suggest.
>
> Thanks.
>
> On 02/05/2016 11:27 AM, Leslie S Satenstein wrote:
>
> What percentage of your hard disk size is that if the swap partition?
> 8gigs of a 300gig drive? or 8 gigs of a 1 terrabyte drive?  Playing with
> swap sizes will not make your system faster. The oonsideration for a swap
> file regarding performance is a) place it next to / partition, and make
> sure it is contigious on the disk.  This is hard to do if it is allocated
> after system updates.
> A dedicated swap partition guarantees that the space allocated is
> contigious.
>
> Is it time to move to more important topics.
>
> Regards
>
>
> *  Leslie *
> *Mr. Leslie Satenstein*
> *Montréal Québec, Canada*
>
>
>
> ------------------------------
> *From:* Jos Collin <[email protected]> <[email protected]>
> *To:* [email protected]; [email protected]
> *Sent:* Thursday, February 4, 2016 11:35 AM
> *Subject:* Re: Swap
>
> I think that's a good idea. I will create a swap file instead of a swap
> partition, so that I can monitor and change it easily at a later point of
> time. In that case, I will partition my SSD as a single 120GB ext4, which
> is having a 5gb swap file.
> On 04-Feb-2016 9:50 PM, "[email protected]" <[email protected]> wrote:
>
> Hi,
>
> swap space is crucial if you suspend or hibernate your system. If you want
> to be able to do that, your swap should be at least the same size of your
> RAM. That said, the old rule "RAM size x 2" had sense some time ago, with
> much smaller sizes than nowadays. Nowaday it's not really needed. In your
> case, if you want to be able to suspend and hibernate you need at least
> 4GB, but 8GB wouldn't make much sense. I'd go with 5 GB, or 6 if you work
> with software that requires an awful lot of RAM.
>
> For more infos, see also https://wiki.debian.org/Swap
>
> FG
>
> ---- Messaggio originale ----
> Da : [email protected]
> Data : 04/02/2016 - 16:42 (CET)
> A : [email protected]
> Oggetto : Swap
>
> Hello,
> How much swap space does 4GB ram ideally requires ? I have been using the
> rule "RAM size x 2" for calculating the size of swap. But as the RAM sizes
> are bigger nowadays, is this a wrong calculation ? I mean, is it okay if I
> use 1 GB of swap space (or lesser) for a 4gb RAM ?
> (I use to suspend my system everyday by pressing  alt+shutdown menu in
> gnome 3)
> Please suggest.
> Thanks,
> Jos Collin
>
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