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Ran 21 Oct 2020 09:22PM UTC

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Build # 36092

Build Type

push

travis-ci-com

Committed by

web-flow

Commit Message

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

This option controls the concurrency of each Pex subprocess. 

We had set the default low to 2 because—before we added the single resolve optimization—it was common to build multiple PEXes at the same time. This resulted in exhaustion / an OOM issue for Toolchain, which was tricky to figure out.

Now, the user normally builds no more than 1-3 PEXes at a time, unless running `./pants package ::` or does not use a constraints file so we can't use a single resolve. So, our default is missing out on performance.

PEX's normal default is `cpu_count`. Instead, we use `cpu_count / 2` to try to balance performance vs. safety.

[ci skip-rust]
[ci skip-build-wheels]

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Jobs

ID	Job ID	Ran	Files	Coverage
4	36092.4 (PANTS_CONFIG_FILES="${TRAVIS_BUILD_DIR}/pants.travis-ci.toml" PANTS_DYNAMIC_UI=false LC_ALL="en_US.UTF-8" AWS_BUCKET=ci-public.pantsbuild.org BOOTSTRAPPED_PEX_KEY_PREFIX=daily/${TRAVIS_BUILD_NUMBER}/${TRAVIS_BUILD_ID}/pants.pex NATIVE_ENGINE_SO_KEY_PREFIX=monthly/native_engine_so PYENV_PY27_VERSION=2.7.18 PYENV_PY36_VERSION=3.6.10 PYENV_PY37_VERSION=3.7.7 PYENV_PY38_VERSION=3.8.3 PYENV_ROOT_OSX=${HOME}/.pants_pyenv PYENV_ROOT="${PYENV_ROOT:-${PYENV_ROOT_OSX}}" PATH="${PYENV_ROOT}/shims:${PATH}" AWS_CLI_ROOT="${HOME}/.aws_cli" AWS_ACCESS_KEY_ID__TO_BE_REEXPORTED_ON_DEPLOYS=AKIAV6A6G7RQ2HFZ5KP7 AWS_SECRET_ACCESS_KEY=[secure] RUST_BACKTRACE="all" BOOTSTRAPPED_PEX_KEY_SUFFIX=py36.linux PANTS_REMOTE_CA_CERTS_PATH=/usr/lib/google-cloud-sdk/lib/third_party/grpc/_cython/_credentials/roots.pem CACHE_NAME=python_tests.py36)	21 Oct 2020 09:22PM UTC	0	0.0	Travis Job 36092.4

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