mpiexec.hydra

Launches an MPI job using the Hydra process manager.

Syntax

mpiexec.hydra <g-options> <l-options> <executable>

or

mpiexec.hydra <g-options> <l-options> <executable1> : <l-options> <executable2>

Arguments

<g-options>

Global options that apply to all MPI processes

<l-options>

Local options that apply to a single argument set

<executable>

./a.out or path/name of the executable file

Description

Use the mpiexec.hydra utility to run MPI applications using the Hydra process manager.

Use the first short command-line syntax to start all MPI processes of the <executable> with the single set of arguments. For example, the following command executes a.out over the specified processes and hosts:

$ mpiexec.hydra -f <hostfile> -n <# of processes> ./a.out

where:

  • <# of processes> specifies the number of processes on which to run the a.out executable

  • <hostfile> specifies a list of hosts on which to run the a.out executable

Use the second long command-line syntax to set different argument sets for different MPI program runs. For example, the following command executes two different binaries with different argument sets:

$ mpiexec.hydra -f <hostfile> -env <VAR1> <VAL1> -n 2 ./a.out : \
-env <VAR2> <VAL2> -n 2 ./b.out

Note

You need to distinguish global options from local options. In a command-line syntax, place the local options after the global options.

For more complete information about compiler optimizations, see our Optimization Notice.
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