SWAP Question?

[Midnite Mac (.com)]

Thank you, Roy!

On Aug 12, 2009, at 2:19 AM, Roy Sigurd Karlsbakk <roy at karlsbakk.net>  
wrote:

> On 10. aug.. 2009, at 23.28, Michael S. Mason wrote:
>
>> Hello All,
>>
>> My name is Michael,
>>
>> I have a new Dell Server that I am about to install Ubuntu 9.04  
>> Server
>> AMD64 onto. I have 4 GB's of RAM. My question? Is there any need  
>> for a
>> SWAP partition with 4GB's of RAM?
>
>
> Hi
>
> I see you have gotten a few answers from others, mostly saying "you
> don't need swap" or similar.
>
> Given the fact that memory requirements increase while available
> memory increases, although the availability may rise quicker, the old
> thumb of rule is still a good one: Use memory size as a base for swap
> size and make the swap 1-2x memory size. Swap used to be a last effort
> in case of (almost) full memory. Newer methods of swapping mechanisms,
> such as those in recent Linux kernels, have changed this. Setting the
> sysctl vm.swappiness variable to 100 makes Linux start swapping out
> earlier, which is good for most systems. Swapping out memory not
> currently in use (that is, malloc()ed and written to and forgotten) is
> good, since it means the system can use its memory for something
> useful, such as caching. Disabling swap altogether is not recommended,
> since a standard linux build relies on swap. You can build a linux
> kernel without swap support, but I don't really see the point.
>
> My advice: with 4 gigs of memory, make a swap partition of 4 gigs,
> perhaps more if you're paranoid. Disk space are so cheap these days,
> that space will cost you less than a dollar. Also - set vm.swappiness
> = 100 in /etc/sysctl.conf (that is /proc/sys/vm/swappiness) to make
> Linux start swapping out early. It will just swap out all those pages
> not regularly referenced, which is good.
>
> roy
> --
> Roy Sigurd Karlsbakk
> (+47) 97542685
> roy at karlsbakk.net
> http://blogg.karlsbakk.net/
> --
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