# Container runtime: "docker" (default) or "singularity"
RuntimeEngine: docker
+ # Number of "supervisor" containers eligible to run at any given
+ # time expressed as a fraction of CloudVMs.MaxInstances. A
+ # supervisor is a container who's purpose is to submit other
+ # containers, such as a container running arvados-cwl-runner.
+ # If there is a hard limit on the amount of concurrent
+ # containers that the cluster can run, it is important to avoid
+ # crowding out the containers doing useful work with containers
+ # who just create more work.
+ SupervisorFraction: 0.3
+
# When running a container, run a dedicated keepstore process,
# using the specified number of 64 MiB memory buffers per
# allocated CPU core (VCPUs in the container's runtime