qard user
@nodejs core contributor, founded tracing (now diagnostics) working group. I hack on compilers and VMs.
Funding Links: https://github.com/sponsors/Qard
Stephen Belanger · Vancouver, BC, Canada · Datadog · 417 followers · 1,099 stars · 240 repositories · joined November 2022
GitHub Sponsors Profile
I'm currently contributing to Node.js and V8 full-time, working on diagnostics-related features. In the last year:
I introduced executionAsyncResource()
I contributed to parts of AsyncLocalStorage
I create the incoming diagnostics_channel feature
I significantly improved the performance of async_hooks in promise-heavy applications by avoiding GC-tracking of promises where no destroy hook is in-use
I fixed PromiseHook support for thenables in V8, allowing context tracking with AsyncLocalStorage, or similar systems built on top of async_hooks, to correctly propagate context when using thenables, which are commonly used in database libraries
I'm currently working on a rewrite of the PromiseHook support in V8 to use JSFunctions rather than C++, which eliminates many expensive barrier hops between generated code, runtime functions, and external C++. This should improve PromiseHook performance and therefore also async_hooks performance quite dramatically.
In the future, I hope to rewrite many parts of async_hooks to trigger lifecycle functions from within JavaScript, wherever possible, further eliminating barrier hops and being much friendlier to the optimizer in V8.
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