README.md

wasm-coremark

CoreMark 1.0 ported to WebAssembly.

CoreMark is a simple, yet sophisticated benchmark that is designed specifically to test the functionality of a processor core. Running CoreMark produces a single-number score allowing users to make quick comparisons between processors.

Source: https://github.com/eembc/coremark

Online demo: here

Builds

• coremark.wasm - WASI app
• coremark-minimal.wasm - Simple wasm module with minimal runtime dependencies
• coremark-emcc.* - Emscripten build

Running WASI app

Ypu can use any WASI-compatible runtime to run it directly:

# Wasm3
wasm3 coremark.wasm

# kanaka/wac
wax coremark.wasm

# WAMR (wasm-micro-runtime)
iwasm coremark.wasm

# wasmtime
wasmtime --optimize coremark.wasm

# WAVM
wavm run coremark.wasm

# Wasmer
wasmer run --singlepass coremark.wasm
wasmer run --cranelift coremark.wasm
wasmer run --llvm coremark.wasm

# Webassembly.sh
wapm install coremark
coremark

# Wasmer-JS (V8)
wasmer-js run coremark.wasm

# V8 interpreter
node --wasm-interpret-all $(which wasmer-js) run coremark.wasm

An interesting way to run it, is to drag'n'drop it to webassembly.sh console, then just type:

coremark

Running Emscripten version

You can open it with your browser.

Or, if you need to run a local copy:

python3 -m http.server 8000
# visit http://localhost:8000/coremark-emcc.html

Using Node.js:

node coremark-emcc.js

Running minimal version

You can open it with your browser.

Or, if you need to run a local copy:

python3 -m http.server 8000
# visit http://localhost:8000/coremark-minimal.html

coremark-minimal.py is provided as an example of how to load and execute it with Wasm3 engine using pywasm3.

To run with any wasm runtime:

1. You need to provide an u32 env.clock_ms() function, which should return current time in milliseconds.
2. Call f32 run() function. It should take 12..20 seconds to execute and return a CoreMark result.

Build instructions

git clone https://github.com/eembc/coremark.git
cd coremark

# WASI build
make compile PORT_DIR=simple CC=wasicc  PORT_CFLAGS="-O3" EXE=.wasm

# Emscripten build
make compile PORT_DIR=simple CC=emcc    PORT_CFLAGS="-O3" EXE=-emcc.html

# Native 32-bit build, for comparison:
make compile PORT_DIR=simple PORT_CFLAGS="-O3" XCFLAGS="-m32" EXE=.elf

minimal build is more complex, and requires modification of core_main.c.

Toolchain versions

Builds were produced using:

# WASIENV
wasienv 0.5.4
wasi-sdk 12.0
clang version 11.0.0 (https://github.com/llvm/llvm-project 176249bd6732a8044d457092ed932768724a6f06)

# EMCC
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 1.39.12
clang version 11.0.0 (/b/s/w/ir/cache/git/chromium.googlesource.com-external-github.com-llvm-llvm--project eaa55590945a130131a47a4d2b89e3bbdfced79e)