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Mention how to build for maximum performance
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@ -396,6 +396,9 @@ You can pass options to Python's `configure` and compiler flags to customize the
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see [_Special environment variables_ in Python-Build's README](plugins/python-build/README.md#special-environment-variables)
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for details.
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**NOTE:** If you'd like a faster interpreter at the cost of longer build times,
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see [_Building for maximum performance_ in Python-Build's README](plugins/python-build/README.md#building-for-maximum-performance).
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**NOTE:** If you want to use proxy for download, please set the `http_proxy` and `https_proxy`
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environment variables.
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@ -164,6 +164,21 @@ the version(s) installed with `--enable-shared`.
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$ env PYTHON_CONFIGURE_OPTS="--enable-shared" pyenv install 2.7.9
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```
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### Building for maximum performance
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Building CPython with `--enable-optimizations` will result in a faster
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interpreter at the cost of significantly longer build times. Most notably, this
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enables PGO (profile guided optimization). While your mileage may vary, it is
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common for performance improvement from this to be in the ballpark of 30%.
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```sh
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env PYTHON_CONFIGURE_OPTS='--enable-optimizations --with-lto' PYTHON_CFLAGS='-march=native -mtune=native' pyenv install 3.6.0
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```
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You can also customize the task used for profile guided optimization by setting
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the `PROFILE_TASK` environment variable, for instance, `PROFILE_TASK='-m
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test.regrtest --pgo -j0'` will run much faster than the default task.
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### Checksum verification
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If you have the `shasum`, `openssl`, or `sha256sum` tool installed, python-build will
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