Mailinglist Archive: opensuse (5100 mails)
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Re: [SLE] Name Service Cache Daemon
- From: "Linda A. W." <suse@xxxxxxxxx>
- Date: Wed, 30 Jun 2004 15:17:00 -0700
- Message-id: <40E33BDC.1030704@xxxxxxxxx>
It caches names from /etc/passwd and /etc/group in memory so library
routines that look up username and group entries won't have to look in the
disk file.
It _shouldn't_ take anytime (virtually), at all, to load unless you have a
very large /etc/password or /etc/group file. Doesn't sound like you would
in your situation.
You could try "chkconfig nscd off" (as root) to turn it off during boot
and see if you notice a performance impact. I can't think of any reason
why it would be as slow as you described. It's configuration file is in
/etc/nscd.conf. Note that host-caching is known to be insecure is
probably toggled off. I've reduced the number of threads from 6 to 4 on
my system since I only have 2 processors -- there shouldn't be that much
"pounding" of the nscd service on a single user system. I also reduced my
"suggested-size" from 211 down to 137 since I only have about 80 entries
in each of my group and passwd files. 97 might also work in my case (I
note that the value of "211" is a prime number and that may be a useful
property in choosing the value of the number of entries -- I don't know,
but I decided to choose 137 (or 97) because they were also primes (see
"factor" command line util or man page).
-l
Dennis J. Tuchler wrote:
routines that look up username and group entries won't have to look in the
disk file.
It _shouldn't_ take anytime (virtually), at all, to load unless you have a
very large /etc/password or /etc/group file. Doesn't sound like you would
in your situation.
You could try "chkconfig nscd off" (as root) to turn it off during boot
and see if you notice a performance impact. I can't think of any reason
why it would be as slow as you described. It's configuration file is in
/etc/nscd.conf. Note that host-caching is known to be insecure is
probably toggled off. I've reduced the number of threads from 6 to 4 on
my system since I only have 2 processors -- there shouldn't be that much
"pounding" of the nscd service on a single user system. I also reduced my
"suggested-size" from 211 down to 137 since I only have about 80 entries
in each of my group and passwd files. 97 might also work in my case (I
note that the value of "211" is a prime number and that may be a useful
property in choosing the value of the number of entries -- I don't know,
but I decided to choose 137 (or 97) because they were also primes (see
"factor" command line util or man page).
-l
Dennis J. Tuchler wrote:
<>What does the Name Service Cache Daemon do? My installation is a solo
installation and one of the computers I use stops for about a minute to load
that daemon. If I don't need it, what do I amend to keep that thing from
loading?
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