build(deps-dev): bump async from 2.22.0 to 2.23.0

[dependabot]

Bumps async from 2.22.0 to 2.23.0.

Changelog

Sourced from async's changelog.

v2.23.0

• Rename ASYNC_SCHEDULER_DEFAULT_WORKER_POOL to ASYNC_SCHEDULER_WORKER_POOL.

Fiber Stall Profiler

After several iterations of experimentation, we are officially introducing the fiber stall profiler, implemented using the optional fiber-profiler gem. This gem is not included by default, but can be added to your project:

$ bundle add fiber-profiler

After adding the gem, you can enable the fiber stall profiler by setting the FIBER_PROFILER_CAPTURE=true environment variable:

$ FIBER_PROFILER_CAPTURE=true bundle exec ruby -rasync -e 'Async{Fiber.blocking{sleep 0.1}}'
Fiber stalled for 0.105 seconds
-e:1 in c-call '#<Class:Fiber>#blocking' (0.105s)
	-e:1 in c-call 'Kernel#sleep' (0.105s)
Skipped 1 calls that were too short to be meaningful.

The fiber profiler will help you find problems with your code that cause the event loop to stall, which can be a common source of performance issues in asynchronous code.

v2.21.1

Worker Pool

Ruby 3.4 will feature a new fiber scheduler hook, blocking_operation_wait which allows the scheduler to redirect the work given to rb_nogvl to a worker pool.

The Async scheduler optionally supports this feature using a worker pool, by using the following environment variable:

ASYNC_SCHEDULER_WORKER_POOL=true

This will cause the scheduler to use a worker pool for general blocking operations, rather than blocking the event loop.

It should be noted that this isn't a net win, as the overhead of using a worker pool can be significant compared to the rb_nogvl work. As such, it is recommended to benchmark your application with and without the worker pool to determine if it is beneficial.

v2.20.0

Traces and Metrics Providers

Async now has traces and metrics providers for various core classes. This allows you to emit traces and metrics to a suitable backend (including DataDog, New Relic, OpenTelemetry, etc.) for monitoring and debugging purposes.

To take advantage of this feature, you will need to introduce your own config/traces.rb and config/metrics.rb. Async's own repository includes these files for testing purposes, you could copy them into your own project and modify them as needed.

v2.19.0

Async::Scheduler Debugging

... (truncated)

Commits

• 671c5a6 Bump minor version.
• 3a08e13 Remove unused rescue.
• 2277c2d Fix coverage CI title.
• aeba0de Tidy up environment variable usage.
• a2b56e9 Add release notes for the fiber profiler.
• 18c33e8 Add optional support for the fiber-profiler gem. (#376)
• See full diff in compare view

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