LAMWIPE(1)                         LAM TOOLS                        LAMWIPE(1)


       lamwipe - Shutdown LAM.


       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" sec-
                   tion, 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

       -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.


       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  ter-
       minates  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  termi-
       nate 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 mod-
       ules.  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> ar-
       gument 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 PB-
           SPro / 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

       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 correspond-
       ing environment variables before running lamwipe.  The form of the  en-
       vironment 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 en-
       vironment  variable  --  they are not checked (by lamwipe) for correct-
       ness.  Illegal or incorrect <value> arguments may or may not be report-
       ed -- 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.


       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.


       recon(1), lamboot(1), tkill(1), bhost(5),  lam-helpfile(5),  lamssi(7),

LAM 7.1.1                       September, 2004                     LAMWIPE(1)

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