131 lines
5.7 KiB
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131 lines
5.7 KiB
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From exmh-workers-admin@redhat.com Mon Sep 2 12:33:34 2002
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X-Mailer: exmh version 2.5.9 07/25/2002 with nmh-1.0.4
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To: Chris Garrigues <cwg-dated-1031061610.7c4931@DeepEddy.Com>
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Cc: Robert Elz <kre@munnari.OZ.AU>, exmh-workers@example.com
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Subject: Re: New Sequences Window
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In-Reply-To: <1030629610.14240.TMDA@deepeddy.vircio.com>
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References: <1030629610.14240.TMDA@deepeddy.vircio.com>
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Comments: In-reply-to Chris Garrigues <cwg-dated-1031061610.7c4931@DeepEddy.Com>
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message dated "Thu, 29 Aug 2002 10:00:08 -0400."
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From: Brent Welch <welch@panasas.com>
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Date: Fri, 30 Aug 2002 16:58:19 -0700
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>>>Chris Garrigues said:
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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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>
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> As I'd written the code a few months ago, we were reading the sequences
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> file
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> first to see what sequences were in it and then once per sequence. This
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>
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> happens anywhere that we look at sequences, most notably in
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> Ftoc_ShowSequences.
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> That seemed to be an obvious lose performancewise, but I wanted my
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> 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
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> another
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> call to get the data off of disk, but I felt that the
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> check-the-modify-time
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> technique would be less error-prone.
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I like the check-the-modify-time technique.
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> I think the biggest gains would be from augmenting Ftoc_ShowSequences to
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> allow
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> a finer specification of what needs to be updated in the ftoc so that
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> the
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> current code would only be run when we really do have to update all
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> sequences
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> for all messages. I described these thoughts in an email message
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> yesterday.
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>
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> And again, if it can wait a few weeks, I'm willing to do it.
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OK - I've yet to dive into the latest round of changes, but I plan to.
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I can say I'll make any progress, but I may dabble. Thanks again for
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all your work in this area. Generalized sequence support has been on
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my to do list for about 8 years.
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--
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Brent Welch
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Software Architect, Panasas Inc
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Pioneering the World's Most Scalable and Agile Storage Network
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www.panasas.com
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welch@panasas.com
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