mpiexec
Run an MPI program
Synopsis
mpiexec args executable pgmargs [ : args executable pgmargs ... ]
where args are command line arguments for mpiexec (see below),
executable is the name of an executable MPI program, and pgmargs
are command line arguments for the executable. Multiple executables
can be specified by using the colon notation (for MPMD - Multiple Program
Multiple Data applications). For example, the following command will run
the MPI program a.out on 4 processes:
mpiexec \-n 4 a.out
The MPI standard specifies the following arguments and their meanings:
- -n <np>
- Specify the number of processes to use
- -host <hostname>
- Name of host on which to run processes
- -arch <architecture name>
- Pick hosts with this architecture type
- -wdir <working directory>
- cd to this one before running executable
- -path <pathlist>
- use this to find the executable
- -soft <triplets>
- comma separated triplets that specify requested numbers
of processes (see the MPI-2 specification for more details)
- -file <name>
- implementation-defined specification file
- -configfile <name>
- file containing specifications of host/program,
one per line, with # as a comment indicator, e.g., the usual
mpiexec input, but with ":" replaced with a newline. That is,
the configfile contains lines with \-soft, \-n etc.
Additional arguments that are specific to the MPICH implementation
are discussed below.
Note that not all of these parameters are meaningful for all
systems. For example, the gforker version of mpiexec creates all
processes on the same system on which it is running; in that case, the
\-arch and \-host options are ignored.
The colon character (:) may be used to separate different executables
for MPMD (multiple program multiple data) programming. For example,
to run the program ocean on 4 processes and air on 8 processes, use:
mpiexec \-n 4 ocean : \-n 8 air
MPICH-Specific Arguments
Many of the implementations of process managers in MPICH support the
following arguments to mpiexec:
- -np <num>
- A synonym for the standard \-n argument
- -env <name> <value>
- Set the environment variable <name> to <value> for
the processes being run by mpiexec
- -envnone
- Pass no environment variables (other than ones specified with
other \-env or \-genv arguments) to the processes being run by mpiexec.
By default, all environment
variables are provided to each MPI process (rationale: principle of
least surprise for the user)
- -envlist <list>
- Pass the listed environment variables (names separated
by commas), with their current values, to the processes being run by
mpiexec.
- -genv <name> <value>
- The \-genv options have the same meaning as their
corresponding \-env version, except they apply to all executables, not just
the current executable (in the case that the colon syntax is used to specify
multiple execuables).
- -genvnone
- Like \-envnone, but for all executables
- -genvlist <list>
- Like \-envlist, but for all executables
- -usize <n>
- Specify the value returned for the value of the attribute
MPI_UNIVERSE_SIZE.
- -l
- Label standard out and standard error (stdout and stderr) with
the rank of the process
- -maxtime <n>
- Set a timelimit of <n> seconds.
- -exitinfo
- Provide more information on the reason each process exited if
there is an abnormal exit
Environment variables for mpiexec
The following environment variables are understood by some versions of
mpiexec. The command line arguments have priority over these; that is,
if both the environment variable and command line argument are used, the
value specified by the command line argument is used.
- MPIEXEC_TIMEOUT
- Maximum running time in seconds. mpiexec will
terminate MPI programs that take longer than the value specified by
MPIEXEC_TIMEOUT.
- MPIEXEC_UNIVERSE_SIZE
- Set the universe size
- MPIEXEC_PORT_RANGE
- Set the range of ports that mpiexec will use
in communicating with the processes that it starts. The format of
this is <low>:<high>. For example, to specify any port between
10000 and 10100, use 10000:10100.
- MPICH_PORT_RANGE
- Has the same meaning as MPIEXEC_PORT_RANGE and
is used if MPIEXEC_PORT_RANGE is not set.
- MPIEXEC_PREFIX_DEFAULT
- If this environment variable is set, output
to standard output is prefixed by the rank in MPI_COMM_WORLD of the
process and output to standard error is prefixed by the rank and the
text (err); both are followed by an angle bracket (>). If
this variable is not set, there is no prefix.
- MPIEXEC_PREFIX_STDOUT
- Set the prefix used for lines sent to standard
output. A %d is replaced with the rank in MPI_COMM_WORLD; a %w is
replaced with an indication of which MPI_COMM_WORLD in MPI jobs that
involve multiple MPI_COMM_WORLDs (e.g., ones that use MPI_Comm_spawn or
MPI_Comm_connect).
- MPIEXEC_PREFIX_STDERR
- Like MPIEXEC_PREFIX_STDOUT, but for standard error.
Return Status
mpiexec returns the maximum of the exit status values of all of the
processes created by mpiexec.
Location:/tmp/E4EAqJnlG0/mpich-3.1rc3/src/env/mpiexec.txt