Date: Wed, 29 Jan 1997 10:41:24 -0500 (EST) From: Charles Henrich <henrich@crh.cl.msu.edu> To: freebsd-questions@freebsd.org Subject: INN .overview and FFS on FreeBSD Message-ID: <199701291541.KAA04537@crh.cl.msu.edu>
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According to the INN FAQ:
2. (this is more important than #1) Move the .overview files out of
the /var/spool/news hierarchy.
[snip]
Why does doing all this speed up overchan? overchan works by opening
the proper ".overview" file, appending 1 line to it, then closing the
file. If you have the ".overview" file in the same directory as 10000
articles then opening the ".overview" file will take a huge amount of
time. The open() call literally searches though about 5000 (half of
10000) file names to find ".overview". If you move your ".overview"
files so that each one is in it's own directory, (say,
/usr/spool/news/over.view/{group}/{name}/.overview) then open() is
searching through 3 files ( ".", "..", and ".overview") to find 1
file. ( O(N/2) where N=10000 vs. N=3... and you thought those first
year CS classes would never be useful!)
Does this hold true with FreeBSD?
-Crh
Charles Henrich Michigan State University henrich@msu.edu
http://pilot.msu.edu/~henrich
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