Re: Mount and Unmount

From: Derek Broughton <news(at)pointerstop.ca>
Date: Fri Aug 31 2007 - 19:32:42 EDT

John L Fjellstad wrote:

> "D. Lam" <lam.dna@gmail.com> writes:
>

>> Perhaps he wants a ramdisk?
>> If so, add this to /etc/fstab:
>> /dev/ram        /media/ramdisk  tmpfs,user  rw 0 0

>
> Isn't it pretty silly to put swap on you ramdisk? Swap is used when you
> run out of memory. You are using memory to do the swap. So basically,
> the OS will swap things out of memory and into swap which is already
> memory. Wouldn't you be better off not using the swap-in-memory, and
> then the OS wouldn't swap in the first place since the memory would
> still be available?
>

You have it backwards. tmpfs puts a temporary filesystem (ramdisk) on your _swap_, not vice versa.

By default /var/lock, /var/run, /dev/shm and udev are all in tmpfs already. I used to keep all of /tmp there when I used Debian (making the swap partition much larger than necessary for actual swapping), but it seems inconsistent with Ubuntu's defaults and I never worked out what I'd need to do that now.

-- 
derek


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Received on Sat Sep 1 09:25:53 2007