Filter async modes
Options for parallelism both in DART and in the model advances:
Simplest case, async=0:
This is a single MPI executable, with each call to the
model being simply a subroutine call from each MPI task.
To the DART mpi intro document
Parallel advance, async=2:
The filter executable is one MPI program, and the model is a
single, sequential executable. Each MPI task uses the
unix "system()" call to invoke a shell script (advance_model.csh)
which runs the models as independent programs.
To the DART mpi intro document
Other views of how the async=2 option is structured; these
may be more or less helpful.
Parallel advance, async=2:
Parallel advance, async=2, second version:
Parallel model advance, async=2, showing how data is communicated
between filter and the model thru intermediate files.
IC are 'initial condition' files, UD are 'updated' files.
Parallel model advance, async=4:
The filter executable is one MPI program, and the model is also
an MPI program. The filter executable communicates with the
runme_filter shell script, which sequentially invokes mpirun
to advance each of the model runs, one per ensemble member,
still using advance_model.csh.
To the DART mpi intro document
Parallel model advance, async=4, showing how data is communicated
between filter and the model thru intermediate files.
IC are 'initial condition' files, UD are 'updated' files.
Terms of Use
DART software - Copyright UCAR. This open source software is provided
by UCAR, "as is", without charge, subject to all terms of use at
http://www.image.ucar.edu/DAReS/DART/DART_download
Contact: | Nancy Collins, Jeff Anderson |
Revision: | $Revision$ |
Source: | $URL$ |
Change Date: | $Date$ |
Change history: | try "svn log" or "svn diff" |