Running PyTorch fork-safe in Celery on macOS

📰 Dev.to · Sid Probstein

Run PyTorch safely in Celery on macOS by configuring the environment to avoid fork-safety issues

intermediate Published 1 Jun 2026
Action Steps
  1. Install the latest version of PyTorch using pip
  2. Configure the Celery worker to use the 'spawn' method instead of 'fork' by setting the CELERYD_FORCE_EXECV environment variable
  3. Run the Celery worker with the --without-mingle flag to prevent worker crashes
  4. Test the configuration by running a PyTorch task in Celery and verifying that it completes successfully
  5. Apply the same configuration to all Celery workers in your cluster to ensure consistency
Who Needs to Know This

Data scientists and engineers working with PyTorch and Celery on macOS will benefit from this solution to prevent process crashes and ensure stable task execution

Key Insight

💡 PyTorch is not fork-safe by default, but using the 'spawn' method and configuring the environment can prevent process crashes

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🚀 Run PyTorch safely in Celery on macOS! 🚀

Key Takeaways

Run PyTorch safely in Celery on macOS by configuring the environment to avoid fork-safety issues

Full Article

If you've ever seen this in your Celery logs: Process 'ForkPoolWorker-7' pid:32839 exited with...
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