/tmp-serde-112-bin-increase

Primary LanguageWebAssembly

Binary size increase w/ serde_json 1.0.111 vs 1.0.112

Repro repo that compiles a minimal Wasm binary compiled with 1.0.111 vs 1.0.112.

Prereq:

  • cargo-wasi: cargo install cargo-wasi
  • optionally wasm-tools: cargo install wasm-tools

Build & useful commands:

  • Build both versions: (cd serde_json-111 && cargo wasi build --release) && (cd serde_json-112 && cargo wasi build --release)
  • Filesize: find . -name serde-float.wasm | xargs du -h
  • Copy the WAT and Wasm so they're checked-in: 
    cp ./serde_json-111/target/wasm32-wasi/release/serde-float.wasm serde-111.wasm &&
  cp ./serde_json-112/target/wasm32-wasi/release/serde-float.wasm serde-112.wasm &&
  wasm2wat serde-111.wasm > serde-111.wat && 
  wasm2wat serde-112.wasm > serde-112.wat

Observations:

  • 111 is 83kb, 112 is 92kb
  • 111 has more instructions, but a much smaller DATA segment