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@jezdez jezdez released this 30 Oct 16:37
· 3 commits to 23.10.x since this release
23.10.0
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✨ Special announcement ✨

With this 23.10.0 release we are changing the default solver of conda to conda-libmamba-solver! 🥳 🚀

The previously "classic" solver is based on pycosat/Picosat and will remain part of conda for the foreseeable future, a fallback is possible and available.

Why are we switching the solver?

In short: to make conda faster and more accurate.

A "solver" is the core component of most package managers; it calculates which dependencies (and which version of those dependencies) to install when a user requests to install a package from a package repository. To address growth-related challenges within the conda ecosystem, the conda maintainers, alongside partners Anaconda, Quansight and QuantStack, introduced a new conda dependency solver based on the Mamba project in December 2022.

Since July 2023, the conda-libmamba-solver plugin has been included in all major conda ecosystem installers (miniforge, miniconda, mambaforge and Anaconda Distribution), but was disabled by default. As soon as these installers are updated to contain conda 23.10.0 or later, they will automatically default to using the conda-libmamba-solver plugin.

What can I do if this update doesn't work for me?

If the new solver is not working as you expect:

  • Check if the behavior you are observing is a known issue or a deliberate change.
  • If that's not the case, please consider submitting a bug report or feature request in the conda-libmamba-solver repository.
  • If necessary, you can go back to using the classic solver without modifying your conda installation:
    • When possible, pass the command line option --solver=classic to your conda calls.
    • Otherwise (e.g. for conda build ... or constructor ...), set the environment variable CONDA_SOLVER=classic.
    • For permanent changes, use the conda configuration system: conda config --set solver classic.

Where can I learn more about conda-libmamba-solver?

The documentation of the conda-libmamba-solver plugin can be found on conda.github.io/conda-libmamba-solver.

For more information about the conda-libmamba-solver rollout plan, please also see our blog post from earlier this year.

Changelog

Enhancements

  • Provide --platform and --subdir flags to create environments for non-native platforms, remembering that choice in future operations. (#11505 via #11794)
  • IMPORTANT: Set solver: libmamba as the new default solver. (#12984)

Bug fixes

  • Check name of symlink, not its target against valid configuration file names (condarc, .condarc, or *.yml/yaml). (#12956)
  • Have conda doctor ignore blank lines in ~/.conda/environments.txt. (#12984)

Deprecations

  • Mark conda.cli.main.generate_parser as pending deprecation. Use conda.cli.conda_argparse.generate_parser instead. (#13144)
  • Mark conda.auxlib.collection.firstitem as pending deprecation. (#13144)
  • Mark conda.auxlib.collection.call_each as pending deprecation. (#13144)
  • Mark conda.auxlib.compat.NoneType as pending deprecation. (#13144)
  • Mark conda.auxlib.compat.primative_types as pending deprecation. (#13144)
  • Mark conda.auxlib.compat.utf8_writer as pending deprecation. (#13144)
  • Mark conda.auxlib.exceptions.AuthenticationError as pending deprecation. (#13144)
  • Mark conda.auxlib.exceptions.NotFoundError as pending deprecation. (#13144)
  • Mark conda.auxlib.exceptions.InitializationError as pending deprecation. (#13144)
  • Mark conda.auxlib.exceptions.SenderError as pending deprecation. (#13144)
  • Mark conda.auxlib.exceptions.AssignmentError as pending deprecation. (#13144)
  • Mark conda.auxlib.type_coercion.boolify_truthy_string_ok as pending deprecation. (#13144)
  • Mark conda.auxlib.type_coercion.listify as pending deprecation. (#13144)
  • Mark conda.models.dist.IndexRecord as pending deprecation for removal in 24.9. (#13193)
  • Mark conda.exports.fetch_index as pending deprecation for removal in 24.9. Use conda.core.index.fetch_index instead. (#13194)

Other

  • Constrain minimum conda-build version to >=3.27. (#13177)

Contributors

Contributors

jezdez, dholth, and 5 other contributors
Assets 2