Ramdisk Size

Greg Lindahl lindahl at keyresearch.com
Mon Sep 22 17:52:54 EDT 2003


On Mon, Sep 22, 2003 at 02:34:04PM -0400, Jeffrey B. Layton wrote:

>   Check out Warewulf: warewulf-cluster.org. Very cool cluster
> distribution that uses a very small Ramdisk to hold the necessary
> parts of the OS. I've just started to use it and it's very slick.

That's how Scyld Beowulf works, too.

>   What's the difference between tmpfs and a ramdisk created through
> the kernel? Is there a speed difference?

I believe that tmpfs is dynamically sized, and the Linux ramdisk
device is not.

>   If you are happy with the speed improvement of using a ram disk
> to store the database, you might want to consider squashfs

If he's doing things like gene comparisons, the work of uncompressing
the database would be a huge performance loss.

-- greg

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