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- From: jwil1@cs.aukuni.ac.nz (TMOTA)
- Newsgroups: comp.sys.acorn.tech
- Subject: Re: adfsbuffers
- Message-ID: <1992Dec20.011534.5366@cs.aukuni.ac.nz>
- Date: 20 Dec 92 01:15:34 GMT
- References: <1992Dec18.113330@informatik.uni-kl.de>
- Sender: jwil1@cs.aukuni.ac.nz (TMOTA)
- Organization: Computer Science Dept. University of Auckland
- Lines: 27
-
- m_sattle@informatik.uni-kl.de (Matthias Sattler) writes:
-
- >What are adfsbuffers really good for?
-
- >They should speed up the (hard)disc access but in fact they don't.
- >I tried many different tests (hd-speed tests, compiling c programs, ...)
- >on the harddisc of my A540 (RO2) with adfsbuffers 0 and adfsbuffers 256k.
- >EVERY test with adfsbuffers configured was slightly slower than the test
- >without adfsbuffers.
- >Hmmmmmm... funny isn't it?
-
- Nope... not really... if you read the manual/help info on adfsbuffers, it states
- that it sets the "number of 1024 byte buffers" used by ADFS. That is, I
- get the impression that setting a large value for ADFSBuffers will NOT
- have ANY effect on a SINGLE file, but using (e.g.) 256 buffers will allow
- up to 256 files to be buffered simultaneously.
- A value like 8 or 16 will probably be plenty - this will allow pretty much
- all the files you ca expect to be open at any time to be buffered.
-
- As you may now see, the true test of how well ADFS buffers works is to open
- lots of files for read/writing, and see how different ADFS buffers values
- affect this sort of operation...
-
- --
- _________________ "I'd like to answer this question in two ways:
- /____ _ _/_ __ First in my normal voice, and then
- // / //_//_ /_/ in a silly, high-pitched whine." (Monty Python)
-