Path: utzoo!utgpu!water!watmath!clyde!att!ulysses!hector!ekrell
From: ekrell@hector.UUCP (Eduardo Krell)
Newsgroups: comp.unix.wizards
Subject: Re: What are the ramifications of increasing NGROUPS?
Message-ID: <10573@ulysses.homer.nj.att.com>
Date: 2 Sep 88 23:55:34 GMT
References: <21258@tut.cis.ohio-state.edu>
Sender: netnews@ulysses.homer.nj.att.com
Reply-To: ekrell@hector.UUCP (Eduardo Krell)
Organization: AT&T Bell Laboratories
Lines: 20

In article <21258@tut.cis.ohio-state.edu> karl@triceratops.cis.ohio-state.edu (Karl Kleinpaste) writes:

>I am inclined to send NGROUPS up quite a ways, possibly to 100 or
>higher.
>Can I get away with recompiling just the kernel and
>/bin/login?

I don't think so since the groups are kept in the user structure.
You would have to recompile anything that depends on the size of the user
structure.

>I have never examined the implementation of BSD's multiple groups
>concept closely; this is my first serious approach to this area.

You should consider the fact that it's just an array that gets searched
lineary. Linear search is OK with 8 or 20 groups, but 100?
    
Eduardo Krell                   AT&T Bell Laboratories, Murray Hill, NJ

UUCP: {att,decvax,ucbvax}!ulysses!ekrell  Internet: ekrell@ulysses.att.com