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lamhalt(1)


NAME

   lamhalt - Shutdown the LAM/MPI run-time environment.

SYNOPSIS

   lamhalt [-dhHv]

OPTIONS

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

   -h          Print the command help menu.

   -i          Return  immediately  (even before the LAM universe is fully
               halted); deprecated

   -H          Suppress printing the header message.

   -v          Be verbose.

DESCRIPTION

   The lamhalt tool terminates the LAM software on each of the nodes  that
   were  initially  booted  with  lamboot  and/or  lamgrow.  No additional
   command line arguments are necessary - lamhalt simply sends  a  message
   to  each remote node telling it to shut down.  Each remote node invokes
   tkill(1) locally to shut down.  See tkill(1) for a description  of  how
   LAM is terminated on each node.

   lamhalt  may  fail  if one of the remote nodes has failed, and does not
   respond to lamhalt's queries.  In this  case,  the  lamwipe(1)  command
   should be used to shut down LAM/MPI.  If lamwipe(1) fails, the user can
   manually invoke tkill(1) on the troubled node.  In extreme  cases,  the
   user may have to terminate individual LAM processes with kill(1).

   Older  versions  of  lamhalt would return 1-3 seconds before the entire
   LAM universe was shut down.  This caused problems for some  LAM  users,
   particularly  those  who  had  scripts that invoked lamboot immediately
   after lamhalt.  lamhalt has therefore been changed to  wait  until  the
   entire  LAM  universe is down before exiting.  This makes the execution
   of lamhalt take a few seconds (typically less than 5).

   For  users  who  want  the  old  lamhalt  behavior,  use  the  -i   (or
   "immediate")  switch,  which  will cause lamhalt to return immediately,
   likely before the entire LAM universe has been taken down.

EXAMPLES

   lamhalt -d
       Shutdown LAM on the machines and be verbose about its actions.

SEE ALSO

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



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