Template:Teaching OS
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| System | Lines of code | Kernel type | Language | Hardware environment | Lacks (vs others) |
|---|---|---|---|---|---|
| xv6 | ~10k | Monolithic | C | x86 / RISC-V | POSIX layer, user-space drivers |
| Pintos | ~25k | Monolithic | C | x86 (typically under QEMU/Bochs) | SMP support, user-space drivers |
| Nachos | ~15k | No kernel. User-space OS simulator | C++ | MIPS simulator | Real hardware, paging, SMP |
| Minix | ~100k+ | Microkernel | C | x86 | — |
| Xinu | ~10k | Monolithic | C | x86 / ARM | Paging, VM, SMP |
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