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Update characteristics of default context #16

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Merged
ysbaddaden merged 3 commits into from
Oct 31, 2025
Merged

Update characteristics of default context #16

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959085c
Update characteristics of default context
straight-shoota Oct 27, 2025
2756307
Revert "Update characteristics of default context"
straight-shoota Oct 30, 2025
b021a06
Add note about changes since RFC
straight-shoota Oct 30, 2025
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3 changes: 3 additions & 0 deletions text/0002-execution-contexts.md
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Expand Up @@ -201,6 +201,9 @@ It might be configured to run on one thread, hence disabling the parallelism of

**Note**: until Crystal 2.x the default execution context might be ST by default, to avoid breaking changes, and a compilation flag be required to choose MT by default (e.g. `-Dmt`).

> [!NOTE]
> 2025-10-27: The characteristics of the default context have been adjusted in [#16136](https://github.com/crystal-lang/crystal/pull/16136). See the [API docs](https://crystal-lang.org/api/Fiber/ExecutionContext.html#the-default-execution-context) for details.

## The additional execution contexts

Applications can create other execution contexts in addition to the default one. These contexts can have different behaviors. For example a context may make sure some fibers will never run in parallel or will have dedicated resources to run in (never blocking certain fibers). Even allow to tweak the threads' priority and CPU affinity for better allocations on CPU cores.
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