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)