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From r..@ai.mit.edu (Robert S. Thau)
Subject Re: httpd patch P12 updated.
Date Fri, 10 Mar 1995 10:51:57 GMT
   Date: Fri, 10 Mar 1995 04:06:39 -0800
   From: Web Admin <www@steam.com>

   Shared-memory name server cache.

   rst has something like this, though its portability can't be
   guaranteed.  (There are things which claim to be Unix which don't
   support shared memory in any form).

   --- cliffs on Fri Mar 10 04:03:52 PST 1995 ---

   I question how much speed this will gain over running named localy
   to cache names.  It seems like a lot of trouble for a little gain.

   --- cliffs on Fri Mar 10 04;06;31 PST 1995 ---

On many Suns, namespace lookup goes through NIS before it even gets to
named, which effectively serializes the transactions, since NIS is
single-threaded (besides which, NIS is a pig under the best of
circumstances and NIS+ is worse).  In any case, lookup in the
shared-memory cache is quite a bit faster than than invoking named, no
matter what named itself does afterwards.

rst




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