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SCOUG-HELP Mailing List Archives

Return to [ 08 | June | 2003 ]

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Date: Sun, 8 Jun 2003 14:13:38 PDT7
From: "Steven Levine" <steve53@earthlink.net >
Reply-To: scoug-help@scoug.com
To: scoug-help@scoug.com
Subject: SCOUG-Help: HDD cache size choice with OS/2

=====================================================
If you are responding to someone asking for help who
may not be a member of this list, be sure to use the
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In <3EE31726.12355.CE5F0DF@localhost>, on 06/08/03
at 10:58 AM, "Dave Watson" said:

>This is an old thread, but my recollection is we were wondering if cache
>was operating system dependent. Bigger cache probably improves things
>in some situations. But does it have different effects on different
>operating systems, especially detriments to OS2?

The effect of a cache is dependent on lot of factors. Peter covered most
of them. Keep in mind that a cache is only effective if it contains the
data that needed at a moment in time. In the case of sequential reads, of
a large file the cache that does not do lookahead reads is not going
improve performance much, if at all. If the file access is essentially
randon, lookahead reads might actually degrade performance. The drive
might be busy doing a lookahead read and this will delay the random read.

Steven

--
---------------------------------------------------------------------
"Steven Levine" MR2/ICE 2.37 #10183 Warp4/FP15/14.085_W4
www.scoug.com irc.webbnet.org #scoug (Wed 7pm PST)
---------------------------------------------------------------------

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The Southern California OS/2 User Group
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Copyright 2001 the Southern California OS/2 User Group. ALL RIGHTS RESERVED.

SCOUG, Warp Expo West, and Warpfest are trademarks of the Southern California OS/2 User Group. OS/2, Workplace Shell, and IBM are registered trademarks of International Business Machines Corporation. All other trademarks remain the property of their respective owners.