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Example: Run a Job on a CPU if a GPU is not Available
=====================================================
Some jobs may be able to take advantage of GPU if one is available, but
can run on a CPU if there are no slots with GPUs immediately matchable.
The following submit file will match a job in this case, using
:subcom:`rank` to prefer a GPU when both are available.
.. code-block:: condor-submit
# This example comes from
# https://htcondor.readthedocs.io/en/latest/faq/users/prefer-gpu-to-cpu.html
## Execution section. You will need to change these for your job
executable = /bin/sleep
arguments = 600
## Requirements section. Also, probably needs customization.
request_CPUs = 1
request_Memory = 2G
request_Disk = 20G
require_GPUs = Capability > 4
## File transfer section.
should_transfer_files = true
transfer_input_files = input1, input2
## Magic section: don't change anything with rank or request_GPUs unless you
## understand why it works.
rank = RequestGPUs
# If your job requires more than one GPU, you may change both
# of the '1's in the next line to some other number.
request_GPUs = countMatches(RequireGPUs, AvailableGPUs) >= 1 ? 1 : 0
## Queue section.
queue 1
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