mandelbrot

simple Mandelbrot set fractal visualiser

building

native binary

use plain cargo build

wasm target

you need Emscripten sdk
and a emscripten rust target

rustup target add wasm32-unknown-emscripten

then to build run

cargo rustc --target=wasm32-unknown-emscripten --release

benchmarks

I was using sp-wasm to run WASM binary.
Benchmarks are run on iMac, Intel Core i7, 4 GHz

$ bench '~/git/sp-wasm/target/release/wasm-sandbox -I x -O x -o out.png \
>  -w target/wasm32-unknown-emscripten/release/mandelbrot.wasm \
>  -j target/wasm32-unknown-emscripten/release/mandelbrot.js \
>  0.2 0.35 0.6 0.45 1000 1000' '~/git/mandelbrot/target/release/mandelbrot 0.2 0.35 0.6 0.45 1000 1000' 
benchmarking bench/~/git/sp-wasm/target/release/wasm-sandbox -I x -O x -o out.png \
  -w target/wasm32-unknown-emscripten/release/mandelbrot.wasm \
  -j target/wasm32-unknown-emscripten/release/mandelbrot.js \
  0.2 0.35 0.6 0.45 1000 1000
time                 1.261 s    (1.218 s .. 1.285 s)
                     1.000 R²   (1.000 R² .. 1.000 R²)
mean                 1.276 s    (1.268 s .. 1.281 s)
std dev              8.042 ms   (1.371 ms .. 10.49 ms)
variance introduced by outliers: 19% (moderately inflated)

benchmarking bench/~/git/mandelbrot/target/release/mandelbrot 0.2 0.35 0.6 0.45 1000 1000
time                 337.2 ms   (NaN s .. 338.6 ms)
                     1.000 R²   (1.000 R² .. 1.000 R²)
mean                 336.7 ms   (336.2 ms .. 336.9 ms)
std dev              361.0 μs   (41.75 μs .. 461.3 μs)
variance introduced by outliers: 19% (moderately inflated)

As we can see WASM execution takes ~4x longer.