wasm-inflate

Minimal inflate example in WebAssembly (wasm).

Build with:

wasm-pack build --target web

Then serve index.html with your static server of choice.

Reproduce the "Big slow-down in WebAssembly" #55 issue

I am referencing here issue #55 in the inflate crate.

1. Download the file at https://dumps.wikimedia.org/enwiki/latest/enwiki-latest-all-titles-in-ns0.gz for "somewhat" benchmarking.
2. Rename it data.gz and place it at the root of this repository.
3. Ungzip it into a data file which should be around 300MB.
4. Remove file data.gz and cargo run --release --bin prepare which will use libflate to deflate data into a new data.gz file of roughly 90MB.
5. cargo run --release --bin rustnative for benchmark with native compilation
6. wasm-pack build --target web will generate an wasm code.
7. Load index.html page with the server of your choice (python -m http.server 8080).
8. Open console in dev tools and use the file loader in the page to start wasm benchmark.

Bench results

On my computer, with rustc 1.36.0, inflate 0.4.5, libflate 0.1.25, wasm-bindgen 0.2.47, I have the following results with native rust compilation:

Elapsed (inflate_bytes): Ok(2.85300905s)
Elapsed (DeflateDecoder): Ok(3.021417847s)
Elapsed (DeflateDecoderBuf): Ok(2.992962828s)
Elapsed (InflateStream): Ok(2.565384845s)
Elapsed (InflateWriter): Ok(2.905209633s)
Elapsed (libflate): Ok(2.312502443s)

And in wasm with Firefox 67.0.4 I got:

inflate_bytes: 9991 milliseconds.
deflate_decoder: 9434 milliseconds.
deflate_decoder_buf: 9258 milliseconds.
inflate_stream: 7964 milliseconds.
inflate_writer: 8848 milliseconds.
libflate: 4902 milliseconds.