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Solver: Cache Concretization Results (#48198)

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Concretizer caching for reusing solver results
This commit is contained in:
John W. Parent
2025-02-28 13:42:00 -05:00
committed by GitHub
parent 4a5922a0ec
commit d234df62d7
12 changed files with 697 additions and 143 deletions
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51
lib/spack/docs/config_yaml.rst
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@@ -125,6 +125,8 @@ are stored in ``$spack/var/spack/cache``. These are stored indefinitely
by default. Can be purged with :ref:`spack clean --downloads
<cmd-spack-clean>`.
.. _Misc Cache:
--------------------
``misc_cache``
--------------------
@@ -334,3 +336,52 @@ create a new alias called ``inst`` that will always call ``install -v``:
aliases:
inst: install -v
-------------------------------
``concretization_cache:enable``
-------------------------------
When set to ``true``, Spack will utilize a cache of solver outputs from
successful concretization runs. When enabled, Spack will check the concretization
cache prior to running the solver. If a previous request to solve a given
problem is present in the cache, Spack will load the concrete specs and other
solver data from the cache rather than running the solver. Specs not previously
concretized will be added to the cache on a successful solve. The cache additionally
holds solver statistics, so commands like ``spack solve`` will still return information
about the run that produced a given solver result.
This cache is a subcache of the :ref:`Misc Cache` and as such will be cleaned when the Misc
Cache is cleaned.
When ``false`` or ommitted, all concretization requests will be performed from scatch
----------------------------
``concretization_cache:url``
----------------------------
Path to the location where Spack will root the concretization cache. Currently this only supports
paths on the local filesystem.
Default location is under the :ref:`Misc Cache` at: ``$misc_cache/concretization``
------------------------------------
``concretization_cache:entry_limit``
------------------------------------
Sets a limit on the number of concretization results that Spack will cache. The limit is evaluated
after each concretization run; if Spack has stored more results than the limit allows, the
oldest concretization results are pruned until 10% of the limit has been removed.
Setting this value to 0 disables the automatic pruning. It is expected users will be
responsible for maintaining this cache.
-----------------------------------
``concretization_cache:size_limit``
-----------------------------------
Sets a limit on the size of the concretization cache in bytes. The limit is evaluated
after each concretization run; if Spack has stored more results than the limit allows, the
oldest concretization results are pruned until 10% of the limit has been removed.
Setting this value to 0 disables the automatic pruning. It is expected users will be
responsible for maintaining this cache.