Date: Wed, 5 Jan 2005 23:00:55 GMT From: Bruce Campbell <bruce@engmail.uwaterloo.ca> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/75855: getpwent functions on 5.3 with large password file extremely slow Message-ID: <200501052300.j05N0tl7099298@freefall.freebsd.org>
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The following reply was made to PR kern/75855; it has been noted by GNATS.
From: Bruce Campbell <bruce@engmail.uwaterloo.ca>
To: freebsd-gnats-submit@FreeBSD.org
Cc:
Subject: Re: kern/75855: getpwent functions on 5.3 with large password file extremely slow
Date: Wed, 5 Jan 2005 17:54:58 -0500
One of my co-workers appears to be on to something...
----- Forwarded message from Paul McKone <pdmckone at engmail uwaterloo ca> -----
After a bit of reading:
in /etc/nsswitch.conf
passwd: compat
produces lots and lots of lseek's
passwd: files
produces the expected number
"compat" is the compatibility database method for nis and stuff, or something
like that, called by nsdispatch, which is called by getpwent.c
"files" just looks at /etc/passwd and /etc/master.passwd
I've changed the entries for group and passwd in ecserv14's /etc/nsswitch.conf
group: files
passwd: files
and the output from "truss -f /root/a.out | & wc -l" has grone from 16341 to 119
lines.
We are onto something here. I don't know what's going on, but it's tied into
"nsdispatch" and "compat" somehow.
PDM
--
Paul McKone Engineering Computing Waterloo Unlimited
BASc Systems Manager Development Team
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Bruce Campbell
Engineering Computing
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University of Waterloo
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