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From: slavenbg@prle2.UUCP (Gert Slavenburg)
Newsgroups: net.micro.atari16
Subject: Re: Ram disks - Ram Cache?
Message-ID: <5@prle2.UUCP>
Date: Thu, 13-Mar-86 05:54:21 EST
Article-I.D.: prle2.5
Posted: Thu Mar 13 05:54:21 1986
Date-Received: Sun, 16-Mar-86 10:44:57 EST
References: <12267320@ee.UUCP> <500044@iuvax.UUCP> <442@ccivax.UUCP>
Reply-To: slavenbg@prle2.UUCP (PUT YOUR NAME HERE)
Organization: Philips Research Laboratories Eindhoven
Lines: 28

Can anyone tell me what exactly a RAM cache is. I am the person who 
originally made the 520ST RAMdisk, and am thinking about also making a
RAMcache if such proves usefull. However, I have never seen one (though
I can guess a lot) and need some ideas on the functionality.

What I guessed is :
  write through (keep disks updated)
  cache on read miss
  cache on write
  adjustable size cache

What I don't know is :
  do you want it to be completely invisible (no commands)
  how pessimistic should it be about disk exchanges

I can imagine the usefullness of such a tool. However, you still also need
a smaller RAMdisk, since a lot of time goes into write & verify of intermediate
files for C compilers etc. 

Any experience and suggestions please DIRECTLY to me, I'll summarize on the
net.

Gert Slavenburg
..mcvax!prle1!prle2!slavenbg
"mcvax!prle1!prle2!slavenbg"@seismo.ARPA
gert@su-pescadero.ARPA