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fix(celery): update worker concurrency defaults #1228

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Merged
mihow merged 2 commits into from
Apr 15, 2026
Merged

fix(celery): update worker concurrency defaults #1228

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44dd942
fix(celery): bump worker concurrency default to 16
mihow Apr 14, 2026
07a1c2b
chore(celery): lower default concurrency to 8, document prod override
mihow Apr 15, 2026
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7 changes: 7 additions & 0 deletions config/settings/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -393,6 +393,13 @@ def _celery_result_backend_url(redis_url):
CELERY_WORKER_PREFETCH_MULTIPLIER = 1
CELERY_WORKER_ENABLE_PREFETCH_COUNT_REDUCTION = True

# Worker concurrency (prefork pool size)
# https://docs.celeryq.dev/en/stable/userguide/configuration.html#worker-concurrency
# Default when unset is os.cpu_count(), which underutilises this workload because
# process_nats_pipeline_result is DB/Redis-bound and spends most of its time on I/O.
# Override via CELERY_WORKER_CONCURRENCY env var per deployment.
CELERY_WORKER_CONCURRENCY = env.int("CELERY_WORKER_CONCURRENCY", default=16)

# Cancel & return to queue if connection is lost
# https://docs.celeryq.dev/en/latest/userguide/configuration.html#worker-cancel-long-running-tasks-on-connection-loss
CELERY_WORKER_CANCEL_LONG_RUNNING_TASKS_ON_CONNECTION_LOSS = True
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