Hi all, The SpiderMonkey (JS) team has been working on a significant update to our JITs called WarpBuilder (or just Warp) [0,1]. Before we enable Warp by default in Nightly (hopefully next cycle in 83) we need your help dogfooding it.
Warp improves performance by reducing the amount of internal type information that is tracked, optimizing for a broader spectrum of cases, and by leveraging the same CacheIR optimizations used by last year’s BaselineInterpreter work [2]. As a result, Warp has a much simpler design and improves responsiveness and page load performance significantly (we're seeing 5-15% improvements on many visual metrics tests). Speedometer is about 10% faster with Warp. The JS engine also uses less memory when Warp is enabled. To enable Warp in Nightly: 1. Update to a recent Nightly 2. Go to about:config and set the "javascript.options.warp" pref to true 3. Restart the browser We're especially interested in stability issues and real-world performance problems. Warp is currently slower on various synthetic JS benchmarks such as Octane (which we will continue investigating in the coming months) but should perform well on web content. If you find any issues, please file bugs blocking: https://bugzilla.mozilla.org/show_bug.cgi?id=1613592 If you notice any improvements, we'd love to hear about those too. Finally, we want to thank our amazing contributors André Bargull and Tom Schuster for their help implementing and porting many optimizations. Turning Warp on is only our first step, and we expect to see a lot of new optimization work over the next year as we build on this. We are excited for what the future holds here. Thanks! The Warp team [0] WarpBuilder still utilizes the backend of IonMonkey so we don't feel it has earned the WarpMonkey name just yet. [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1613592 [2] https://hacks.mozilla.org/2019/08/the-baseline-interpreter-a-faster-js-interpreter-in-firefox-70/ _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
