From:	CSBVAX::CSBVAX::MRGATE::"SMTP::CRVAX.SRI.COM::RELAY-INFO-VAX"  9-FEB-1989 06:49
To:	MRGATE::"ARISIA::EVERHART"
Subj:	Cluster-wide show users (CLUSTER_WHO).


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Date: 8 Feb 89 23:13:45 GMT
From: quanta.eng.ohio-state.edu!kcgl1.eng.ohio-state.edu!JONESD@tut.cis.ohio-state.edu  (David Jones)
Organization: Ohio State University
Subject: Cluster-wide show users (CLUSTER_WHO).
Message-Id: <1729@quanta.eng.ohio-state.edu>
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I wrote a cluster-wide show user utility that displays all users logged in
on all nodes of a cluster.  It works by having a detached process periodically
(2 min.) poll the system and pass that information via DECnet and the
distributed lock manager to the daemons on the other nodes.  When the user
runs the same image as a client, CLUSTER_WHO queries the local daemon for the
latest information, formats it, and writes it to sys$output.

The utility has three major features:

    > Low system overhead.  CPU utilization is below 1% for a 5 node
      cluster with 20-50 concurrent users.

    > Quick response to client requests.  Obtaining the list of
      cluster-wide users takes the same amount of time as a normal
      SHOW USER command.

    > The utility is self configuring.  The node list is built up
      using the lock manager and DECnet transactions.

The source is written in FORTRAN and will be posted in 3 parts as encoded data.
Concatenate the 3 pieces together and invoke as a command procedure.  Decoding
of the data is done entirely in DCL, so it is very slow (2 hrs on a microvax).
Once decoded, however, you'll have a compressed text library containing the
source and a command procedure to build the image from the source.


David L. Jones               |      Phone:    (614) 292-6929
Ohio State Unviversity       |      Internet:
1971 Neil Ave. Rm. 406       |               jonesd@kcgl1.eng.ohio-state.edu
Columbus, OH 43210           |               jones-d@eng.ohio-state.edu

Disclaimer: A repudiation of a claim.