Caucus System Requirements

This page describes the technical and system requirements necessary to run Caucus on a Unix host server.

Caucus must be installed on the same host that is running a compatible web server.  Caucus must have its own userid, which owns and contains all of the Caucus data files and programs.  Caucus uses the "setuid" bit to control and protect access to its conference data files.  (Caucus does not run as setuid 'root'.)

The rest of this page describes specific system requirements and resource usage.

Caucus runs on the following Unix platforms (and in principle, can run on any unix server):

Web Server Requirements:
Caucus is compatible with most full-featured Web servers.  (See "What Web Servers Does Caucus Work With?".)

Other Software Requirements:
Some of Caucus' extended features require MySQL, although it will run without it.

Disk Space Requirements:
The Caucus kit requires approximately 25 megabytes to install.  (That is the maximum size, some systems may need less.)  We recommend, however, starting with 100MB of space to allow room for growth of the conferences.

Memory Requirements:
Caucus has run on systems as small as an Intel 486 with 16MB of memory.  A more typical "modern" linux system with a Penitum processor would have at least 128M.  Caucus uses approximately (N + 1) * 0.6 MB of memory, where N is the number of simultaneous Caucus users.

Process Requirements:
Each simultaneous Caucus user gets one dedicated "daemon" or server process for the duration of their session.  In addition, the request for each Caucus page involves two other processes: an httpd (web server) process, and a temporary lightweight process called "swebsock". 

Thus, the process load for N simultaneous Caucus users varies from N to 3 * N, depending on how rapidly Caucus requests are being served.  A typical number is about 1.5 * N.

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