Certain tasks (like generating grades) require a great deal of memory that isn't properly freed up. This creates a queue for such workers so that we can give them different configuration settings -- in this case, setting CELERYD_MAX_TASKS_PER_CHILD=1 to force workers to die after they process one job. Because these jobs tend to run for hours, the overhead is not a big deal.
Certain tasks (like generating grades) require a great deal of
memory that isn't properly freed up. This creates a queue for such
workers so that we can give them different configuration settings
-- in this case, setting CELERYD_MAX_TASKS_PER_CHILD=1 to force
workers to die after they process one job. Because these jobs tend
to run for hours, the overhead is not a big deal.

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