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python312Packages.numpyro: reduce number of pytest parallel workers to reduce RAM usage #372111

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Jan 9, 2025
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python312Packages.numpyro: reduce number of pytest parallel workers to reduce RAM usage #372111

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3 changes: 3 additions & 0 deletions pkgs/development/python-modules/numpyro/default.nix
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Expand Up @@ -64,6 +64,9 @@ buildPythonPackage rec {
pythonImportsCheck = [ "numpyro" ];

pytestFlagsArray = [
# Tests memory consumption grows significantly with the number of parallel processes (reaches ~200GB with 80 jobs)
"--maxprocesses=8"

# A few tests fail with:
# UserWarning: There are not enough devices to run parallel chains: expected 2 but got 1.
# Chains will be drawn sequentially. If you are running MCMC in CPU, consider using `numpyro.set_host_device_count(2)` at the beginning of your program.
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