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appschema(5)


NAME

   appschema - LAM application schema format

SYNTAX

   #
   # comments
   #
   [<where>] [-np #] [-s <where>] [-wd <dir>] [-x <env>] <program> [<args>]
   [<where>] [-np #] [-s <where>] [-wd <dir>] [-x <env>] <program> [<args>]
    ...

DESCRIPTION

   The application schema is an ASCII file containing a description of the
   programs which constitute an application.  It  is  used  by  mpirun(1),
   MPI_Comm_spawn, and MPI_Comm_spawn_multiple to start an MPI application
   (the MPI_Info key "file" can be  used  to  specify  an  app  schema  to
   MPI_Comm_spawn  and  MPI_Comm_spawn_multiple).   All  tokens  after the
   program name will be passed  as  command  line  arguments  to  the  new
   processes.   Ordering  of the other elements on the command line is not
   important.

   The meaning of the options is  the  same  as  in  mpirun(1).   See  the
   mpirun(1)  man  page  for a lengthy discussion of the nomenclature used
   for <where>.  Note, however, that if -wd is  used  in  the  application
   schema  file,  it  will override any -wd value specified on the command
   line.

   For each program line, processes will be created on LAM nodes according
   to the presence of <where> and the process count option (-np).

   only <where>  One process is created on each node.

   only -np      The  specified  number  of processes are scheduled across
                 all LAM nodes/CPUs.

   both          The specified number of processes  are  scheduled  across
                 the specified nodes/CPUs.

   neither       One process is created on the local node.

   Program Transfer
   By  default,  LAM  searches  for executable programs on the target node
   where a particular instantiation will run.  If the file system  is  not
   shared, the target nodes are homogeneous, and the program is frequently
   recompiled, it can be convenient to have LAM transfer the program  from
   a  source  node  (usually  the local node) to each target node.  The -s
   option specifies this behaviour and identifies the single source node.

EXAMPLE

   #
   # Example application schema
   # Note that it may be necessary to specify the entire pathname for
   # "master" and "slave" if you get "File not found" errors from
   # mpirun(1).
   #
   # This schema starts a "master" process on CPU 0 with the argument
   # "42.0", and then 10 "slave" processes (that are all sent from the
   # local node) scheduled across all available CPUs.
   #
   c0 master 42.0
   C -np 10 -s h slave

SEE ALSO

   mpirun(1),        MPI_Comm_spawn(2),        MPI_Comm_Spawn_multiple(2),
   MPIL_Spawn(2), introu(1)



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