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Process Engines
Once you have defined a workflow, there are different ways to run the
processes it consists of. The simplest way is to turn the workflow into
a Guile script that sets up the desired environment and then executes
the workflow processes on the current machine. This is what the
simple-engine
does.
The drmaa-engine
submits generated process scripts to an HPC
cluster scheduler implementing
DRMAA version 1, such as
the various incarnations of
Grid Engine or
Slurm. To use this engine you must
first set the environment variable GUILE_DRMAA_LIBRARY
to the
location of the libdrmaa.so shared library provided by your HPC
scheduler. Here is an example command from a system using Altair Grid
Engine:
export GUILE_DRMAA_LIBRARY=/opt/age-8.7.0/drmaa/lib/lx-amd64/libdrmaa.so
The grid-engine
is similar to the simple-engine
in that
it generates a shell script, with the difference that it also includes
resource variable definitions for submission to a Grid Engine
scheduling system. The resource variables are derived from the
process run-time
field. This process engine is deprecated in
favor of drmaa-engine
.