Herdtools 
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Simplified user-level management of a "herd" of machines

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The Herdtools are a set of Perl scripts which perform various "job parallel"
functions so that you can control a "herd", or cluster, of machines from
one connection.  In most cases, the Herdtools use rsh or ssh to actually
do the work for you; in other cases, they may connect to Rob Brown's
procstatd to collect some information; in still other cases, they may
simply read a file on disk and report information back to you.

In any event, the idea is to provide a consistent interface for selecting
relevant groups of machines:  all machines in the "cow" cluster, or all
machines that have F90 compilers, or all machines except those with the
"mem512" tag.


cl_hosts	prints the list of hosts that will be used
cl_exec		run a command, in parallel, on multiple machines
cl_sig		sends a signal to all named programs on multiple machines
cl_kill		sends the KILL signal to all names programs on mult machines
cl_cp		copies a file from a global file-space to a local file-space
cl_ipcs		shows Unix IPC items on remote machines
cl_ipcrm	cleans up Unix IPC items on remote machines
cl_sudo		run a command, in parallel, on multiple machines as super-user

cl_ps		contacts the remote procstatd to perform a ps
cl_proc		contacts the remote procstatd and dumps all info
cl_quik		contacts the remote procstatd and gets some quick info

cl_stat		prints the current cluster status (from webwatchd)
cl_motd		prints the motd for the cluster

webwatchd	periodically connects to all procstatd's and dumps info
		to a web page
kick_web	can be used to give webwatchd a "kick" and re-connect to
		the machines

cl_bcast	EXPERIMENTAL: copies a file to remote machines using a 
		binary tree broadcast
dirsync		EXPERIMENTAL: intelligently copies the files in a directory 
		to remote machines; only copies changed files
cl_multirun	EXPERIMENTAL: intelligently runs a command on multiple input
		data sets on multiple machines


30 January 2002, John Pormann, Duke University, [email protected]