WebVM

• container2wasm/container2wasm
  • c2w-net-proxy
  • RISC-V (riscv64): Recommended, faster emulation with TinyEMU
    • 单线程
  • x86_64: Slower, uses Bochs emulator
  • QEMU Mode: --to-js for Emscripten output with JIT (larger but faster)
    • 支持 MTTCG
• bjorn3/browser_wasi_shim
• mame/xterm-pty
• containers/gvisor-tap-vsock
• joelseverin/linux-wasm
  • fast, buggy
  • 把 linux 编译为 wasm
  • 不是 emu 或者 vm
  • binfmt_wasm
  • HN #45783074
• webassembly/wasi-libc
• cheerpx
  • cheerpx.io
  • 虚拟化引擎
  • 闭源
  • x86 -> wasm jit compiler
  • virtual block fs
  • Linux syscall emulator
  • Free
    • ❌ Self-Hosting not allowed
    • ❌ OEM/Redistribution
  • Small
    • £100 per developer per month
• WebVM: leaningtech/webvm
• copy/v86
  • 32bits x86
  • 支持很多老的架构
  • Rust, WASM
  • 比 TinyEMU 快
  • x86_64 copy/v86#133
• TinyEMU
  • riscv64, x86
  • 解释器, 10k LOC
• ptitSeb/box64
  • MIT, C
  • Linux Userspace x86_64 Emulator with a twist, targeted at ARM64, RV64 and LoongArch Linux devices
• Bochs
  • x86_64
• QEMU TCG JIT
  • QEMU WASM ktock/qemu-wasm
• userland-run/nano
  • tiny RISC-V user-mode Linux interpreter
  • nodejs+busybox 130MB

# 简单性能测试
# 精度为 1000 位小数
# 4*arctan(1) -> π
time sh -c 'echo "scale=1000; 4*a(1)" | bc -lq' > /dev/null

# linux-wasm 不支持 vfork
date +%s
echo "scale=1000; 4*a(1)" | bc -lq > /dev/null
date +%s

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c2w

• c2w-net-proxy
  • browser fetch
  • gvisor-tap-vsock
• c2w-net
  • delegate websocket
  • gvisor-tap-vsock