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lamnodes(1)


NAME

   lamnodes - Resolve LAM node/CPU notation to Unix hostnames.

SYNOPSIS

   lamnodes [-chin] [where]

OPTIONS

   -c          Suppress printing the CPU count for each node.

   -h          Print the command help menu.

   -i          Print IP addresses (instead of IP names)

   -n          Suppress printing CPU count for each node

DESCRIPTION

   The  lamnodes  command  is used to resolve LAM node/CPU nomenclature to
   Unix hostnames.  It can  be  used  to  determine  the  current  running
   configuration  of the LAM/MPI run-time environment, and generate a boot
   schema that can be used to launch LAM in the future.

   By default, lamnodes will print out the node number, default  IP  name,
   CPU  count,  and  per-node  flags  for  each  node  in the running LAM.
   gethostbyaddr(3)   is   used   to   obtain   default   hostnames.    If
   gethostbyaddr(3) fails, the IP number is displayed instead.

   This  command  can  be  used  by  setup shell scripts (and the like) to
   determine information  from  a  currently-running  LAM  universe.   For
   example,  use  lamnodes  to  resolve  particular  CPUs  and/or nodes to
   specific unix hostnames.  In a batch environment, lamnodes can be  used
   to   determine   which   CPUs   share   a   common   node   (note  that
   MPI_GET_PROCESSOR_NAME can be used for  a  similar  effect  in  an  MPI
   program).

   lamnodes also shows per-node flags.  Currently defined flags are:

   origin      The node where lamboot was executed.

   this_node   The node where lamnodes is running.

   no_schedule The  node  will not be used to run MPI and serial processes
               when N and C are used to mpirun and lamexec.

EXAMPLES

   lamnodes N -n
       Display IP names and CPU counts for all nodes.  This output can  be
       saved and later used with lamboot(1).

   lamnodes C -n -c
       Display  the IP name of the nodes containing each CPU, and suppress
       the LAM node number and CPU count.  This output can  be  saved  and
       later used with lamboot(1).

SEE ALSO

   bhost(5), gethostbyaddr(3), lamboot(1)



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