Re: how can run linux (kernel and gui from ram)
couse the big uptimes of debain (some times for weekes without
rebooting) i can mount all root (expect /home) to memory and to gain
read/write much faster.
the files are cped from my harddrive (i thouth using cron to backup the /usr and / ).
isn't 1gb of ram enuth for KDE + OpenOffice?
On 8/17/06,
Roberto C. Sanchez <roberto@familiasanchez.net> wrote:
On Thu, Aug 17, 2006 at 10:51:12PM +0200, Jabka Atu wrote:
> Hello..
> im going to buy a new pc with 4gb ram .
> id like to run whole system from ram :
> at boot that files will be cpd to ram disk and then the kernal will load
> from ramdisk :
> sevrel Question :
> can i some how change loaded kernal path :
> after boot remount it from other place.
> will Kde (or Xfce ) run faster if i run it from mem? (no read/write
> needed time).
>
I don't mean to be negative, but your scheme makes little sense. The
*only* thing that you will accomplish by running from RAM is that
read/write times will be reduced. Now, you can't do this for all writes
since you really need pretty much all of /var on disk so that a system
or power failure does not completely trash every bit of your system
state. Additionally, in the grand scheme things, you read from disk
much more often that you write. You generally only write when some
state is being saved to disk or when you save a file. Beyond that,
nearly every other interaction with disk is loading programs, libraries
or other files into memory.
The Linux kernel has a very good memory manager. When you first start
up your machine things like KDE and OpenOffice will probably take a bit
of time to load. Now, if you leave your machine running all the time,
then Linux will keep everything cached in memory. Since you generally
only use a small percentage of what is installed on your system this
works out quite well.
What you want to do is give up much of your very fast RAM (I am guessing
around 3 GB) to store your / and /usr at least) so that when you go to
use something is quickly transfered from one part of RAM to another. Of
course, you will now have much less RAM and Linux will spend time
clearing out things from the remaining 1 GB to make room for other
things that are loaded. Then the images for the new programs and
libraries must be transferred back and forth. I would argue that you
would lose overall performance.
Regards,
-Roberto
--
Roberto C. Sanchez
http://familiasanchez.net/~roberto
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