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>]

-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.

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.

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 <value>s 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.

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.

lamwipe -v mynodes

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

laminstalldir/etc/lam-bhost.def

default boot schema file, where "laminstalldir" is the directory where LAM/MPI was installed.