140 lines
6.4 KiB
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140 lines
6.4 KiB
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From exmh-workers-admin@redhat.com Thu Aug 29 15:08:59 2002
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To: Brent Welch <welch@panasas.com>
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Cc: Robert Elz <kre@munnari.OZ.AU>, exmh-workers@spamassassin.taint.org
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Subject: Re: New Sequences Window
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From: Chris Garrigues <cwg-exmh@DeepEddy.Com>
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Date: Thu, 29 Aug 2002 09:00:08 -0500
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--==_Exmh_948625160P
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Content-Type: text/plain; charset=us-ascii
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> From: Brent Welch <welch@panasas.com>
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> Date: Wed, 28 Aug 2002 22:40:21 -0700
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>
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> Well, I've used the check-the-modify-time cache trick for files in
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> many places (not just exmh) so some part of me certainly thinks it
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> is effective. However, it occurred to me that if we do checkpoint
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> state, then aren't we modifying the sequences file for the current
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> folder on every message read? Perhaps we look at the sequences file
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> more than once per message view?
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As I'd written the code a few months ago, we were reading the sequences file
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first to see what sequences were in it and then once per sequence. This
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happens anywhere that we look at sequences, most notably in Ftoc_ShowSequences.
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That seemed to be an obvious lose performancewise, but I wanted my abstraction to
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have a separate call for "what sequences are in this folder?" and "what
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messages are in this sequence?". One option would have been to add another
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call to get the data off of disk, but I felt that the check-the-modify-time
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technique would be less error-prone.
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I think the biggest gains would be from augmenting Ftoc_ShowSequences to allow
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a finer specification of what needs to be updated in the ftoc so that the
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current code would only be run when we really do have to update all sequences
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for all messages. I described these thoughts in an email message yesterday.
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And again, if it can wait a few weeks, I'm willing to do it.
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Chris
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--
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Chris Garrigues http://www.DeepEddy.Com/~cwg/
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virCIO http://www.virCIO.Com
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716 Congress, Suite 200
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Austin, TX 78701 +1 512 374 0500
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World War III: The Wrong-Doers Vs. the Evil-Doers.
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--==_Exmh_948625160P
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Comment: Exmh version 2.2_20000822 06/23/2000
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--==_Exmh_948625160P--
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_______________________________________________
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