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The primary change introduced in this commit is partitioning of the `TaggedCache`, with each partition being indepedent of each other, making it possible to potentially perform multiple cache operations in parallel. In particular, the `sweep` operation is now parallelized by default on systems with at least four cores present. The `TaggedCache` could also be instantiated in 'key-only' mode which complicated the interface significantly but was only used by a single consumer (the `FullBelowCache`). This commit splits the 'key-only' functionality of `TaggedCache`, and incorporates directly into `FullBelowCache`, resulting in simple and cleaner interfaces for both `TaggedCache` and `FullBelowCache` but at a cost: some code duplication. Lastly, this commit includes a medley of changes, including the restructuring of `Transaction`, reducing its size by 48 bytes.
These are modules and sources that support our CMake build.
== FindBoost.cmake ==
In order to facilitate updating to latest releases of boost, we've made a local copy of the FindBoost cmake module in our repo. The latest official version can generally be obtained here.
The latest version provided by Kitware can be tailored for use with the version of CMake that it ships with (typically the next upcoming CMake release). As such, the latest version from the repository might not work perfectly with older versions of CMake - for instance, the latest version might use features or properties only available in the version of CMake that it ships with. Given this, it's best to test any updates to this module with a few different versions of cmake.