Spall – WASM-based profiler for JavaScript and C and Odin
[I'm the author] Spall is a web-accessible profiler that I made to help my web-dev friends load gigabyte+ JSON traces without lunch-break-long load times. Recently, Spall got experimental support for auto-tracing with binary traces (along with an in-progress native-port, to give it more memory headroom), which was used to help track down and fix some hard-to-spot lock contention issues in the Odin-language compiler. I demoed it at the Handmade Seattle conference in October, https://guide.handmade-seattle.com/c/2022/spall/, with a head-to-head against Perfetto,…
In plain words
Spall is a web-based profiler designed to quickly load and analyze large JSON trace files for performance analysis. It supports JavaScript, C, and Odin, and features experimental binary trace auto-tracing capabilities. The tool was built to handle gigabyte-scale traces efficiently and has been used to identify performance issues like lock contention in compiler development. Spall runs in the browser and offers an alternative approach to other profiling tools.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
[I'm the author] Spall is a web-accessible profiler that I made to help my web-dev friends load gigabyte+ JSON traces without lunch-break-long load times. Recently, Spall got experimental support for auto-tracing with binary traces (along with an in-progress native-port, to give it more memory headroom), which was used to help track down and fix some hard-to-spot lock contention issues in the Odin-language compiler. I demoed it at the Handmade Seattle conference in October, https://guide.handmade-seattle.com/c/2022/spall/, with a head-to-head against Perfetto, another big web profiler. I'll be around to answer any questions. Thanks for looking at my project! If you like Spall, you can catch my other projects over at https://colrdavidson.github.io/. If you happen to be hiring I'd love to hear from you. Looking for something fun and new to do after a long sabbatical, working on cool open-source projects!
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