lamwipe - Online in the Cloud

PROGRAM:

NAME

lamwipe - Shutdown LAM.

SYNOPSIS

lamwipe [-b] [-d] [-h] [-v] [-nn] [-np] [-n #] [-prefix /lam/install/path] [-prefix
/lam/install/path/] [-sessionprefix value] [-sessionsuffix value]
[-withlamprefixpath value] [-ssi key value] [bhost]

OPTIONS

-b Assume local and remote shell are the same. This means that only one remote
shell invocation is used to each node. If -b is not used, two remote shell
invocations are used to each node.

-d Turn on debugging mode. This implies -v.

-h Print the command help menu.

-n # Lamwipe only the first # nodes.

-prefix Use the LAM installation specified in /lam/install/path/

-ssi key value
Send arguments to various SSI modules. See the "SSI" section, below.

-v Be verbose.

-nn Don't add "-n" to the remote agent command line

-np Do not force the execution of $HOME/.profile on remote hosts

-session-prefix value
Set the session prefix, overriding LAM_MPI_SESSION_PREFIX.

-session-suffix value
Set the session suffix, overriding LAM_MPI_SESSION_SUFFIX.

-withlamprefixpath value
Override the internal installation path. For internal use only, do not use
unless you know what you are doing.

DESCRIPTION

This command has been deprecated in favor of the lamhalt command. lamwipe should only be
necessary if lamhalt fails and is unable to clean up the LAM run-time environment
properly. The lamwipe tool terminates the LAM software on each of the machines specified
in the boot schema, bhost. lamwipe is the topology tool that terminates LAM on the
UNIX(tm) nodes of a multicomputer system. It invokes tkill(1) on each machine. See
tkill(1) for a description of how LAM is terminated on each node.

The bhost file is a LAM boot schema written in the host file syntax. CPU counts in the
boot schema are ignored by lamwipe. See bhost(5). Instead of the command line, a boot
schema can be specified in the LAMBHOST environment variable. Otherwise a default file,
bhost.def, is used. LAM searches for bhost first in the local directory and then in the
installation directory under etc/.

lamwipe does not quit if a particular remote node cannot be reached or if tkill(1) fails
on any node. A message is printed if either of these failures occur, in which case the
user should investigate the cause of failure and, if necessary, terminate LAM by manually
executing tkill(1) on the problem node(s). In extreme cases, the user may have to
terminate individual LAM processes with kill(1).

lamwipe will terminate after a limited number of nodes if the -n option is given. This is
mainly intended for use by lamboot(1), which invokes lamwipe when a boot does not
successfully complete.

SSI (System Services Interface)
The -ssi switch allows the passing of parameters to various SSI modules. LAM's SSI
modules are described in detail in lamssi(7). SSI modules have direct impact on MPI
programs because they allow tunable parameters to be set at run time (such as which boot
device driver to use, what parameters to pass to that driver, etc.).

The -ssi switch takes two arguments: key and value. The key argument generally specifies
which SSI module will receive the value. For example, the key "boot" is used to select
which RPI to be used for starting processes on remote nodes. The value argument is the
value that is passed. For example:

lamboot -ssi boot tm
Tells LAM to use the "tm" boot module for native launching in PBSPro / OpenPBS
environments (the tm boot module does not require a boot schema).

lamboot -ssi boot rsh -ssi rsh_agent "ssh -x" boot_file
Tells LAM to use the "rsh" boot module, and tells the rsh module to use "ssh -x" as
the specific agent to launch executables on remote nodes.

And so on. LAM's boot SSI modules are described in lamssi_boot(7).

The -ssi switch can be used multiple times to specify different key and/or value
arguments. If the same key is specified more than once, the values are concatenated with
a comma (",") separating them.

Note that the -ssi switch is simply a shortcut for setting environment variables. The
same effect may be accomplished by setting corresponding environment variables before
running lamwipe. The form of the environment variables that LAM sets are:
LAM_MPI_SSI_key=value.

Note that the -ssi switch overrides any previously set environment variables. Also note
that unknown key arguments are still set as environment variable -- they are not checked
(by lamwipe) for correctness. Illegal or incorrect value arguments may or may not be
reported -- it depends on the specific SSI module.

Remote Executable Invocation
All tweakable aspects of launching executables on remote nodes during lamwipe are
discussed in lamssi(7) and lamssi_boot(7). Topics include (but are not limited to):
discovery of remote shell, run-time overrides of the agent use to launch remote
executables (e.g., rsh and ssh), etc.

EXAMPLES

lamwipe -v mynodes
Shutdown LAM on the machines described in the boot schema, mynodes. Report about
important steps as they are done.

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