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LAMGROW(1) LAM COMMANDS LAMGROW(1)
lamgrow - Extend a LAM multicomputer.
lamgrow [-hv] [-c <bhost>] [-u <userid>] [<node>] <hostname>
-h Print useful information on this command.
-c <bhost> Update this boot schema.
-v Be verbose.
<hostname> Extend LAM with this host.
<node> Assign this ID to the new node.
-u <userid> Use this userid to access the new host.
An existing LAM session, initiated by lamboot(1), can be enlarged to include more nodes
with lamgrow. One new node is added for each invocation. At a minimum, the host name
that will run the new node is given on the command line. If a different userid is re-
quired to access the host, it is specified with the -u option.
It can be useful to update the original boot schema used by lamboot(1) with the new node
added by lamgrow. The -c option specifies a boot schema filename and causes lamgrow to
append the host name. The updated boot schema is ready to be used by wipe(1) to terminate
the extended LAM session. New nodes added by lamgrow will not be cleaned up by wipe(1) if
the original boot schema is used. They can be terminated individually, as always, with
The new node can be assigned any unused, non-negative identifier. If no identifier is
specified, the highest node identifier in the current LAM session plus one is used. Note
that lamboot(1) always assigns node identifiers consecutively from 0.
lamgrow can be run from any node. As a LAM command program it must be run from a node in
the existing LAM session. It cannot be run from the intended new host. Two invocations
of lamgrow should not run concurrently and the command attempts to detect this situation.
There is no protection against specifying the name of host that is already part of the us-
er's existing LAM session. This is not the proper use of lamgrow.
Resource managers will be the most common user of lamgrow. When hosts become idle and a
user has expressed a desire to the manager that extra cycles should be exploited, the man-
ager could invoke lamgrow and then launch the specified application process(es) on the new
lamgrow -v newhost
Start LAM on newhost and add it to the existing LAM session. Choose the next avail-
able node identifier and report about important steps as they are done.
lamgrow n30 newhost
Start LAM on newhost with node ID 30 and add it to the existing LAM session. Operate
$LAMHOME/etc/lam-conf.lam default configuration file for LAM nodes
lamboot(1), hboot(1), wipe(1), tkill(1), bhost(5), conf(5)
LAM 6.5.8 November, 2002 LAMGROW(1)
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