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From: davidsen@steinmetz.steinmetz.UUCP (William E. Davidsen Jr)
Newsgroups: comp.unix.xenix
Subject: Re: How is performance of ramdisk under SCO Xenix 2.2
Message-ID: <7603@steinmetz.steinmetz.UUCP>
Date: Mon, 12-Oct-87 13:11:54 EDT
Article-I.D.: steinmet.7603
Posted: Mon Oct 12 13:11:54 1987
Date-Received: Wed, 14-Oct-87 00:36:52 EDT
References: <522@drexel.UUCP>
Reply-To: davidsen@crdos1.UUCP (bill davidsen)
Organization: General Electric CRD, Schenectady, NY
Lines: 23

In article <522@drexel.UUCP> jeff@drexel.UUCP (Jeff White) writes:
|
|  We just received our upgrade of SCO Xenix to version 2.2 today, and I
|noticed in the manual that they now have a built in device driver for a 
|ramdisk.  However, at the end of the manual page, they say that performance
|can actually be WORSE, because the Xenix memory management can make better use
|of the memory.

The important thing is to have enough memory to avoid swapping. If you
have enough for user programs, and have physical memory left over, then
you can make use of the RAMdisk to speed up the initial execution of a
program. Note that if the program is already in memory running for
another user, the code will be shared (as far as I can tell). Loading a
large program when there is a copy in memory is demonstrably faster.

I would check to see if you have programs which are not used
continuously and which are used a lot. That sounds like utilities to me.
I don't have enough memory to use a large RAMdisk, so I can't really do
a lot of testing.
-- 
	bill davidsen		(wedu@ge-crd.arpa)
  {uunet | philabs | seismo}!steinmetz!crdos1!davidsen
"Stupidity, like virtue, is its own reward" -me