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Re: [Nmh-workers] Slowdown with a Populated Folder.

From: Ken Hornstein
Subject: Re: [Nmh-workers] Slowdown with a Populated Folder.
Date: Tue, 31 Dec 2013 14:06:57 -0500

>A couple of points come from it...  Why does mark(1) above have to read
>the folder when it's just doing a list of the .mh_sequences?  Is it
>verifying the sequence's content against what still sits in the folder?

Short answer: yes.  It calls folder_read(), which is calling readdir()
(but not stat()) to get every filename.  That's how invalid sequence
information gets cleaned up silently.  Most nmh programs call
folder_read() at some point.

>`mark -s foo -d all' gives an error if sequence foo doesn't exist, at
>least with this old version.  Consequently, another mark is needed
>first, the one above, to detect if the sequence exists.  A more useful
>interface would cut the number of userspace commands that need to run,
>and thus the number of getdents.

It looks like "mark -s foo -zero -d all" does what you want?  Which is
a bit inelegant, okay ... but if it makes you feel any better, the
sequence isn't actually created on-disk in that case if it doesn't
exist; the creation/deletion step is all internal.


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