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@github-actions github-actions released this 12 May 22:21
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0.9.0
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Learn about vigilant mode.

  • motoko (moc)

    • For beta testing: Add a new incremental GC, enabled with new moc flag --incremental-gc (#3837).
      The incremental garbage collector is designed to scale for large program heap sizes.

      The GC distributes its workload across multiple steps, called increments, that each pause the mutator
      (user's program) for only a limited amount of time. As a result, the GC work can fit within the instruction-limited
      IC messages, regardless of the heap size and the object structures.

      According to GC benchmark measurements, the incremental GC is more efficient than the existing copying, compacting,
      and generational GC in the following regards:

      • Scalability: Able to use the full heap space, 3x more object allocations on average.
      • Shorter interruptions: The GC pause has a maximum limit that is up to 10x shorter.
      • Lower runtimes: The number of executed instructions is reduced by 10% on average (compared to the copying GC).
      • Less GC overhead: The amount of GC work in proportion to the user's program work drops by 10-16%.

      The GC incurs a moderate memory overhead: The allocated WASM memory has been measured to be 9% higher
      on average compared to the copying GC, which is the current default GC.

      To activate the incremental GC under dfx, the following command-line argument needs to be specified in dfx.json:

      ...
  "type" : "motoko"
  ...
  "args" : "--incremental-gc"
...

    • bugfix: array.vals() now returns a working iterator for mutable arrays (#3497, #3967).

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