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Date:      Wed, 30 Apr 2003 21:45:03 -0400
From:      David Gilbert <dgilbert@velocet.ca>
To:        "Jin Guojun [DSD]" <j_guojun@lbl.gov>
Cc:        Michael Nottebrock <michaelnottebrock@gmx.net>
Subject:   Re: SWAP size
Message-ID:  <16048.31775.642709.140262@canoe.velocet.net>
In-Reply-To: <3EB05582.297F50AE@lbl.gov>
References:  <200304281054.48976.ryba@kompakt.pl> <20030430174616.E59039@lorax.ubergeeks.com> <3EB05582.297F50AE@lbl.gov>

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>>>>> "Jin" == Jin Guojun <[DSD]" <j_guojun@lbl.gov>> writes:

Jin> not have a lot of RAM, though ...")  if (1) no money to buy more
Jin> RAM, (2) no slot to put more RAM or (3) it is a server just favor
Jin> by every user to run their programs.

Jin> Swap space is prepared for too many processes outrunning the RAM.
Jin> It is not for improving performance, but exchange cost of disk
Jin> for RAM.  More swap space required means that more swap time
Jin> means slow.

Another thing working in favour of 2x swap is that disk has been
becoming that much cheaper.  With 1G and 2G disks, I was carefully
considering the 256M of swap (2x 128M of memory) that I configured.
With disks of 80G and more, I have been putting 1G of swap on every
spindle I install because it really doesn't make a difference and I'd
rather have 4x 1G swap partitions spread across spindles than only one
4G partition.

That's not to claim that I have 2G of RAM (I actually have 1G), but
disk space in general has become amazingly cheap.

Dave.

-- 
============================================================================
|David Gilbert, Velocet Communications.       | Two things can only be     |
|Mail:       dgilbert@velocet.net             |  equal if and only if they |
|http://daveg.ca                              |   are precisely opposite.  |
=========================================================GLO================



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