Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!bbn!ulowell!m2c!wpi!dseah
From: dseah@wpi.wpi.edu (David I Seah)
Newsgroups: comp.sys.apple
Subject: Re: Which is better? Disk Caching with CDA or NDA?
Keywords: CDA, NDA, Cache, Accessory
Message-ID: <1032@wpi.wpi.edu>
Date: 26 Feb 89 20:56:34 GMT
References: <296@tahoma.UUCP>
Reply-To: dseah@wpi.wpi.edu (David I Seah)
Organization: Worcester Polytechnic Institute, Worcester, MA. USA
Lines: 25

I haven't used the AECache program in a long time (because DiversiCache was
better).   I would expect that it would be redundant to have on a GSOS system
disk.  I used to have the version of AECache that you had to run before
booting a disk, then I got the version that was loaded along with the tools. 
Since the NDA Cache program gets loaded too, AECache is just so much extra
baggage. 

If you run DiversiCache and the GSOS cache at the same time, you may get added
performance.  It usually shaves from 5-10 seconds off the boot time of my GSOS
system disk.  I think the reason this is so is because DiveriCache is a track
oriented cache, while the GSOS one is a last-block-read oriented cache.  I
usually set DiversiCache to a 0K buffer, but this still lets it read an ENTIRE
track into its cache.  GSOS caches the directory, thus eliminating those
annoying journeys from directory to file to directory to file...Another bonus
is that DiveriCache can be tacked onto the end of the ProDOS file (the little
4 block one).  DiversiCache also stays in memory when you do a ctrl-OA-reset,
while AECache goes away.  

Does the GSOS Set Cache NDA actually contain the cache, or does it just
provide an interface to some internal cache that GSOS has inside it?


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