mpiexec(1) HYDRA mpiexec(1) NAME 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 ar- guments for the executable. Multiple executables can be specified by using the colon notation (for MPMD - Multiple Program Multiple Data applica- tions). For example, the following command will run the MPI program a.out on 4 processes: mpiexec -n 4 a.out The MPI standard suggests 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 -wdir <working directory> - cd to this one before running executable -configfile <name> - file containing command-line options. The lines are of the form separated by the colons in the commandline form: mpiexec {<option arguments>} : {...} : {...} : ... : {...} Lines beginning with # are comments, and lines may be continued by terminating the partial line with . The following options are reserved by the MPI standard, but they are not supported by MPICH (hydra): -arch <architecture name> - Pick hosts with this architecture type -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 Additional arguments that are specific to the MPICH implementation are discussed below. The colon character ( : ) may be used to separate different executa- bles for MPMD (multiple program multiple data) programming. For ex- ample, to run the program ocean on 4 processes and air on 8 processes, use: mpiexec -n 4 ocean : -n 8 air MPICH-SPECIFIC ARGUMENTS MPICH implements a few process managers. Here we list a general set of ar- guments that many of the implementations support. More detailed options that are supported by a particular implementation, e.g. hydra, are avail- able via: mpiexec -h Many of the implementations of process managers in MPICH support the fol- lowing 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 executables). -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_UNI- VERSE_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 pro- grams 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. RETURN STATUS mpiexec returns the maximum of the exit status values of all of the processes created by mpiexec . LOCATION /var/tmp/vc8XKeIJUJ/mpich-5.0.1/src/pm/hydra/mansrc/mpiexec.txt 4/10/2026 mpiexec(1)
NAME | SYNOPSIS | MPICH-SPECIFIC ARGUMENTS | ENVIRONMENT VARIABLES FOR MPIEXEC | RETURN STATUS | LOCATION
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