145 lines
6.7 KiB
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145 lines
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From exmh-workers-admin@redhat.com Wed Aug 28 18:49:09 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: Robert Elz <kre@munnari.OZ.AU>
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Cc: Chris Garrigues <cwg-dated-1030976555.34ad5b@DeepEddy.Com>,
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exmh-workers@redhat.com
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Subject: Re: New Sequences Window
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In-Reply-To: <22628.1030545866@munnari.OZ.AU>
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References: <1030544555.28815.TMDA@deepeddy.vircio.com>
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<1030028647.6462.TMDA@deepeddy.vircio.com>
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<1029945287.4797.TMDA@deepeddy.vircio.com>
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<1029882468.3116.TMDA@deepeddy.vircio.com> <9627.1029933001@munnari.OZ.AU>
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<1029943066.26919.TMDA@deepeddy.vircio.com>
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<1029944441.398.TMDA@deepeddy.vircio.com> <13277.1030015920@munnari.OZ.AU>
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<21099.1030543590@munnari.OZ.AU> <22628.1030545866@munnari.OZ.AU>
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Comments: In-reply-to Robert Elz <kre@munnari.OZ.AU> message dated "Wed,
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28 Aug 2002 21:44:26 +0700."
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From: Brent Welch <welch@panasas.com>
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List-Archive: <https://listman.spamassassin.taint.org/mailman/private/exmh-workers/>
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Date: Wed, 28 Aug 2002 10:32:42 -0700
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>>>Robert Elz said:
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> Date: Wed, 28 Aug 2002 09:22:34 -0500
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> From: Chris Garrigues <cwg-dated-1030976555.34ad5b@DeepEddy.Co
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m>
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> Message-ID: <1030544555.28815.TMDA@deepeddy.vircio.com>
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>
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>
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> | so I'll probably poke around at the sequences performance issues,
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>
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> Well, there's this wonderful piece of code in MhSeqExpand ...
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>
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> # Hack to weed out sequence numbers for messages that don't exist
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> foreach m $rseq {
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> if ![file exists $mhProfile(path)/$folder/$m] {
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> Exmh_Debug $mhProfile(path)/$folder/$m not found
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> set ix [lsearch $seq $m]
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> set seq [lreplace $seq $ix $ix]
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> } else {
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> # Real hack
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At least I'm up-front about my hacks :-)
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> break
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> }
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> }
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>
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> which is going to run slow if a sequence happens to start with a bunch
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> of messages that don't exist. I'm not sure why it is important that the
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> first message in the sequence returned exists, but not necessarily any
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> of the others, but I'm sure glad it is, as MhSeqExpand gets called lots,
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> and I don't know if I could cope if it were checking every file in the
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> sequences it is looking at, all the time...
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That was my thinking. My recollection about the first message being valid
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is that the ftoc code wants to find that message to start its highlighting,
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for example, or you are selecting a message to display.
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> It may help to keep a list of the valid message numbers for the current
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> folder (though that would then need to be verified against changes to the
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> directory). Does tcl have a directory read function? I assume so...
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glob -nocomplain $mhProfile(path)/$folder *
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will return an unsorted list of the directory's contents.
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But the thought of keeping an in memory list of valid messages is not fun.
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Exmh already maintains in-core lists of messages in sequences, which is
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already pretty tricky
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> Mh_Sequence also goes and rereads the files (.mh_sequences and the
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> context file) but I'm not sure how frequently that one is called.
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In some places I maintain caches of files by checking their modify time,
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but the sequence files are soo small that by the time you stat them to
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check their date stamp, you could just read them again. Also, now that
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we checkpoint message state on every message view, that file will change
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every time. In the old days exmh used to cache a bunch of state about
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the folder.
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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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