qard

@nodejs core contributor, founded tracing (now diagnostics) working group. I hack on compilers and VMs.

Funding Links: https://github.com/sponsors/Qard

Name: Stephen Belanger
Location: Vancouver, BC, Canada
Company: Datadog
Kind: user
Followers: 417
Following: 71
Total stars: 1099
Repositories count: 240
Created at: 2022-11-02T16:38:20.044Z
Updated at: 2024-05-20T14:11:19.041Z
Last synced at: 2024-05-20T14:11:15.909Z

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.