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Increase default [python-setup].resolver_jobs to cpu_count / 2 #11006

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Oct 21, 2020
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Increase default [python-setup].resolver_jobs to cpu_count / 2 #11006

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5 changes: 3 additions & 2 deletions src/python/pants/python/python_setup.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
# Licensed under the Apache License, Version 2.0 (see LICENSE).

import logging
import multiprocessing
import os
import subprocess
from enum import Enum
Expand Down Expand Up @@ -110,11 +111,11 @@ def register_options(cls, register):
register(
"--resolver-jobs",
type=int,
default=2,
default=multiprocessing.cpu_count() // 2,
advanced=True,
help=(
"The maximum number of concurrent jobs to build wheels with. Because Pants "
"can run multiple subprocesses in parallel, the total parallelism will be "
"can run multiple subprocesses in parallel, the maximum total parallelism will be "
"`--process-execution-{local,remote}-parallelism x --python-setup-resolver-jobs`. "
"Setting this option higher may result in better parallelism, but, if set too "
"high, may result in starvation and Out of Memory errors."
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It didn't seem worth it to mention the edge cases where you want this low vs. high. Way too much detail.

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