py-spy is a sampling profiler that reads the process memory from the outside, so it is safe in production.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | # ====================================================================== # Q: A Celery worker or gunicorn process is stuck at 100% CPU or not responding. # What do you do? # # py-spy is a sampling profiler that reads the process memory from the outside, # so it is safe in production. The dump immediately shows whether the process is # waiting on a socket without a timeout (the usual culprit: requests without a # timeout to the ERP), on a database lock, or in an infinite loop. Once I have # the stack, I restart as mitigation. # ====================================================================== # stack of all threads without a restart and without changing code py-spy dump --pid 12345 # live top-like view: which functions eat CPU py-spy top --pid 12345 # flamegraph for 30s py-spy record -o profile.svg --pid 12345 --duration 30 # in a container SYS_PTRACE is required docker exec -it worker py-spy dump --pid 1 |
