DragonFly On-Line Manual Pages

LAMNODES(1)                        LAM TOOLS                       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)

LAM 7.1.5b2                       June, 2008                       LAMNODES(1)