Re: Swap

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]>
>     *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] <mailto:[email protected]>"
>     <[email protected] <mailto:[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] <mailto:[email protected]>
>                 Data : 04/02/2016 - 16:42 (CET)
>                 A : [email protected]
>                 <mailto:[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
>
>
>
>
>
>