31 lines
1.1 KiB
Python
31 lines
1.1 KiB
Python
import os
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import psutil
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def get_worker_count(worker_kind_name, multiplier, minimum=None, maximum=None):
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""" Returns the number of gunicorn workers to run for the given worker kind,
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based on a combination of environment variable, multiplier, minimum (if any),
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and number of accessible CPU cores.
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"""
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minimum = minimum or multiplier
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maximum = maximum or (multiplier * multiplier)
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# Check for an override via an environment variable.
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override_value = os.environ.get('WORKER_COUNT_' + worker_kind_name.upper())
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if override_value is not None:
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return max(override_value, minimum)
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override_value = os.environ.get('WORKER_COUNT')
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if override_value is not None:
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return max(override_value, minimum)
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# Load the number of CPU cores via affinity, and use that to calculate the
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# number of workers to run.
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p = psutil.Process(os.getpid())
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try:
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cpu_count = len(p.cpu_affinity())
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except AttributeError:
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# cpu_affinity isn't supported on this platform. Assume 2.
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cpu_count = 2
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return min(max(cpu_count * multiplier, minimum), maximum)
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