Inko 0.2.3 released

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Inko 0.2.3 has been released.

This release is a fairly small release. For the most part this release includes various changes related to publishing releases. One change worth discussing more is the introduction of improved garbage collection performance when moving objects.

The garbage collector divides the heap into one or more buckets. The young generation has four buckets, while the mature generation only has a single bucket. Prior to 0.2.3, the garbage collector would lock the source and target buckets when moving objects. This means that only a single object can be promoted or evacuated in parallel, which results in pretty poor garbage collection performance.

With 0.2.3, bucket wide locking has been removed in favour of using atomic operations in various places. This allows garbage collector threads to promote and evacuate objects in parallel. Locking is still necessary when requesting a new block from the global allocator, but this is only necessary once every 1020 objects, as one block can hold 1020 objects. This new setup results in a performance improvement of about 2x compared to the old approach.

More information about these changes can be found in the merge request "Use atomic operations for allocating objects, and remove bucket wide locking".

The full list of changes can be found in the CHANGELOG.