ARES-6 measures the execution time of JavaScript’s newest features, including symbols, for-of, arrow functions, Map/Set/WeakMap, let/const, classes, proxies, string interpolation, destructuring, default arguments, spread, tail calls, and generators.
+ARES-6 measures the execution time of JavaScript’s newest features, including symbols, for-of, arrow functions, Map/Set/WeakMap, let/const, classes, proxies, string interpolation, destructuring, default arguments, spread, tail calls, and generators. ARES-6 comprises two sub-tests: Air and Basic.
-Air is an ES2015 port of the WebKit B3 JIT’s Air::allocateStack phase. This code is a heavy user of Map, Set, classes, spread, and for-of. The benchmark runs allocateStack on hot function bodies from other popular JavaScript benchmarks: executeIteration from Octane/Gameboy, gaussianBlur from Kraken, and scanIdentifier from Octane/Typescript. Because metacircularity, the benchmark also runs allocateStack on the largest hot function in Air. Browse the source.
Air is an ES2015 port of the WebKit B3 JIT’s Air::allocateStack phase. This code is a heavy user of Map, Set, classes, spread, and for-of. The benchmark runs allocateStack on hot function bodies from other popular JavaScript benchmarks: executeIteration from Octane/Gameboy, gaussianBlur from Kraken, and scanIdentifier from Octane/Typescript. Air also runs allocateStack on a hot function from Air itself. Browse the source.
Basic is an ES2015 implementation of the ECMA-55 BASIC standard. BASIC was an interactive language from the start, so our implementation uses generator functions for the entire interpreter. When the BASIC program says INPUT, our interpreter says yield. This allows users of the interpreter to easily integrate it into a runloop. Basic also uses classes, Map, and WeakMap. The benchmark runs a handful of simple programs, the most complex of which finds prime numbers. Browse the source.
Each ARES-6 sample has 200 iterations of Air and 200 iterations of Basic. ARES-6 runs 10 samples, and reports the average with 95% confidence intervals. Each sample runs in a fresh iframe to simulate some of the effects of page navigation.
We like making JavaScript run faster, but we didn’t have any ES2015 code to optimize. ARES-6 is a collection of sample ES2015 code written by the WebKit JavaScript team, which we used to bootstrap our ES2015 optimization efforts.
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