Don't save data on immutable files to per-project disk cache #8802
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yuehuang010
reviewed
May 31, 2023
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rainersigwald
approved these changes
Jun 6, 2023
This was referenced Jun 16, 2023
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Contributes to #8635
Context
With #8688 we no longer need to cache data on immutable framework files on disk as obtaining this information is cheap and does not require I/O.
Changes Made
Made
SystemState(the RAR cache) not add such files to the per-instance dictionary. This dictionary is serialized to disk as<project-file>.AssemblyReference.cacheso the change effectively makes the cache file smaller, saving on serialization and deserialization time.Also refactored
DeserializeCacheinto a generic method instead of taking aTypeparameter.For a simple ASP.NET Core app with one project reference and one package reference, the size of the cache file is reduced from 142 kB to 2 kB. Projects with no references other than the SDK will not have the cache file created at all.
Testing
Existing unit tests, manual measurements.
Notes
The actual "Don't read the file if the data is already in memory" change will be in a separate upcoming PR.