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
https://github.com/joelseverin/linux-wasm/
- fast, buggy
- 把 linux 编译为 wasm
- 不是 emu 或者 vm
- binfmt_wasm
- https://news.ycombinator.com/item?id=45783074
https://github.com/webassembly/wasi-libc
cheerpx
- https://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: https://github.com/leaningtech/webvm
copy/v86
- 32bits x86
- 支持很多老的架构
- Rust, WASM
- 比 TinyEMU 快
- x86_64 https://github.com/copy/v86/issues/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 https://github.com/ktock/qemu-wasm

# 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

env/scale	500	1000	5000
macOS M2 MAX		0.01s	0.75s
alpine riscv64 TinyEMU		22s
alpine x86 v86	23s
linux-wasm		1s

abbr.	stand for	cn
COOP	Cross-Origin-Opener-Policy	跨源开放者政策
COEP	Cross-Origin-Embedder-Policy	跨源嵌入者政策

Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy: require-corp

c2w

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

c2w​

c2w