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Mention how to build for maximum performance

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hauntsaninja 2023-01-02 14:30:28 -08:00
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README.md
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@ -396,6 +396,9 @@ You can pass options to Python's `configure` and compiler flags to customize the
see [_Special environment variables_ in Python-Build's README](plugins/python-build/README.md#special-environment-variables)
for details.
**NOTE:** If you'd like a faster interpreter at the cost of longer build times,
see [_Building for maximum performance_ in Python-Build's README](plugins/python-build/README.md#building-for-maximum-performance).
**NOTE:** If you want to use proxy for download, please set the `http_proxy` and `https_proxy`
environment variables.

15
plugins/python-build/README.md
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@ -164,6 +164,21 @@ the version(s) installed with `--enable-shared`.
$ env PYTHON_CONFIGURE_OPTS="--enable-shared" pyenv install 2.7.9
```
### Building for maximum performance
Building CPython with `--enable-optimizations` will result in a faster
interpreter at the cost of significantly longer build times. Most notably, this
enables PGO (profile guided optimization). While your mileage may vary, it is
common for performance improvement from this to be in the ballpark of 30%.
```sh
env PYTHON_CONFIGURE_OPTS='--enable-optimizations --with-lto' PYTHON_CFLAGS='-march=native -mtune=native' pyenv install 3.6.0
```
You can also customize the task used for profile guided optimization by setting
the `PROFILE_TASK` environment variable, for instance, `PROFILE_TASK='-m
test.regrtest --pgo -j0'` will run much faster than the default task.
### Checksum verification
If you have the `shasum`, `openssl`, or `sha256sum` tool installed, python-build will