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Article #502

Re: adfsbuffers

#502
From: Frank Lancaster
Date: Wed, 23 Dec 1992 15:14
21 lines
1594 bytes
In article <1992Dec22.212234.2185@cs.aukuni.ac.nz> jwil1@cs.aukuni.ac.nz (TMOTA) writes:

>   ... you don't think, perhaps, that the significant improvement is due to
>   the fact that you are reading multiple files and writing to 1? And
>   that the more buffers you have, the more files can be buffered before
>   buffers have to be flushed?
>   Remember that read-buffers should make a difference if you're using a
>   FS that supoprts read-ahead...

No. I'm reading one file and writing another. The writing process is improved
a lot. Especially performance when large files are written to the archive 
is improved. If I have set adfsbuffers to 255 and a file of 100KB is written to
the archive, the writing routine returns immediately and the next file gets
read and compressed while the writing process to the archive continues
in the background.

The C file routines obviously at some point get translated to OS_GPBP
calls, so they are also influenced by adfsbuffers.

-- Frank Lancaster, fl@tools.de
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Message-ID: <FL.92Dec23141448@pierre.tools.de>
Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!Germany.EU.net!tools!fl
References: <1992Dec18.113330@informatik.uni-kl.de><1992Dec20.011534.5366@cs.aukuni.ac.nz> <FL.92Dec21130356@pierre.tools.de> <1992Dec22.212234.2185@cs.aukuni.ac.nz>

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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!Germany.EU.net!tools!fl
From: fl@tools.de (Frank Lancaster)
Newsgroups: comp.sys.acorn.tech
Subject: Re: adfsbuffers
Date: 23 Dec 92 15:14:47 GMT
Organization: Tools GmbH, Bonn, Germany
Lines: 21
Message-ID: <FL.92Dec23141448@pierre.tools.de>
References: <1992Dec18.113330@informatik.uni-kl.de><1992Dec20.011534.5366@cs.aukuni.ac.nz>
 <FL.92Dec21130356@pierre.tools.de>
 <1992Dec22.212234.2185@cs.aukuni.ac.nz>
NNTP-Posting-Host: pierre.tools.de
In-reply-to: jwil1@cs.aukuni.ac.nz's message of Tue, 22 Dec 1992 21:22:34 GMT