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From Brian Behlendorf <br...@wired.com>
Subject Harvest cache now available as an ``httpd accelerator'' (fwd)
Date Wed, 05 Apr 1995 00:36:05 GMT

Have fun with this, kids.....

	Brian

---------- Forwarded message ----------
Date: Tue, 4 Apr 1995 18:30:13 -0600
From: Mike Schwartz <schwartz@latour.cs.colorado.edu>
To: http-wg%cuckoo.hpl.hp.com@hplb.hpl.hp.com
Subject: Harvest cache now available as an ``httpd accelerator''

Hi.  I'm posting this message to the HTTP Working Group mailing list
because I think you may be interested in our generic approach to improving
HTTPD performance.
 - Mike Schwartz
   Principal Investigator, Harvest project
-------------------------------------------------------------------------------
The Harvest "httpd accelerator" is a specially configured Harvest object
cache that intercepts incoming HTTP requests, quickly returning those
requests that have already been cached.  The accelerator resolves cache
misses and dynamically evaluated queries by contacting your real HTTP
server to evaluate the incoming request.

The httpd accelerator is compatible with both CERN httpd and NCSA httpd
(it may work with other httpds as well).  It is easily installed, and is
available for SunOS 4.1.x, Solaris 2.x, OSF/1 2.0 and 3.0, Linux, HP-UX,
AIX, and IRIX (note that at present we only support the first 3 of these
platforms, however).

The httpd accelerator services cache hits blazingly fast because it:
        - runs as a single (threaded) process that never forks,
        - is implemented with non-blocking I/O,
        - keeps meta data and especially hot objects cached in RAM,
        - caches DNS lookups,
        - supports non-blocking DNS lookups, and
        - implements negative caching both of objects and of DNS lookups.

Our measurements indicate that the NCSA httpd (running in standalone
mode) can handle 3 requests per second, while cache hits to the Harvest
httpd accelerator are serviced at 200 requests per second.

For more information about the httpd accelerator, see
http://harvest.cs.colorado.edu/harvest/httpd_accel.html

For information about Harvest (including demos, papers,
software, and documentation) see http://harvest.cs.colorado.edu/


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