cafrun.1.md
cafrun - Coarray Fortran executable launcher for OpenCoarrays
cafrun [-s] -np <N> </path/to/coarray-executable> [arg1 [arg2 ...]]
cafrun is wrapper script which will launch Coarray Fortran
executables across <N> images using the appropriate parallel
runtime that OpenCoarrays was compiled against, (e.g.,
mpiexec(1)). cafrun ensures the correct flags are passed to the
parallel runtime job launcher, as determined by system introspection
at OpenCoarrays build time. Advanced users may compile their Coarray
Fortran code however they please, but we recommend using the caf(1)
compiler wrapper script for a more user friendly experience.
To see the default command run by cafrun, add the -s or --show
flags. To see how a specific command would be executed, simply
construct the command you plan to use to launch your job, and add
-s or --show as the very first flag after cafrun, e.g.,
cafrun -s ... to see how cafrun is translating your invocation for
the parallel runtime job launcher (e.g., mpiexec(1)).
--help, -h
Print a brief help/usage message and return without
performing any substantive action.
-np <N>
Mandatory flag with argument to specify the number of Coarray
Fortran images to be spawned. <N> must be a positive integer.
--reenable-auto-cleanup
If OpenCoarrays is built supporting failed images, which requires
GFortran >= 7.0 and an MPI implementation with user level failure
mitigation support (ULFM) and NOT disabling it at build time, then
cafrun turns OFF mpi auto cleanup, and handles cleanup in the
OpenCoarrays library. This is required to properly support failed
images. --reenable-auto-cleanup re-enables the parallel runtime's
auto cleanup features which breaks the failed images functionality
but provides more robust error detection and application
aborting. If failed images support was not enabled at OpenCoarrays
build time, then this flag is a noop.
--show, -s
Print the default invocation of the underlying parallel
runtime's job launcher (e.g., mpiexec), including what flags are
passed, etc. This also functions as a dry-run for executing a
specific cafrun command, showing the user how the compiler would
be called with the additional files and arguments passed by the
user.
--version, -V, -v
Print OpenCoarrays version and copyright information and exit.
--wrapping, --wraps, -w
Report the version of the parallel runtime cafrun is wrapping and exit.
For a list of bugs currently affecting OpenCoarrays, or to report a new one, please report any bugs to the OpenCoarrays project at https://github.com/sourceryinstitute/OpenCoarrays/issues
Izaak Beekman [email protected]
caf(1), mpiexec(1), gfortran(1), OpenCoarrays project page, OpenCoarrays website
