DorianZheng

#!/usr/bin/env python3
"""Run a custom FUSE filesystem inside a BoxLite VM."""

import asyncio
from pathlib import Path

import boxlite

HERE = Path(__file__).parent

DorianZheng

#!/usr/bin/env python3  # Shebang for direct execution
import asyncio  # Async runtime for SimpleBox
import boxlite  # BoxLite Python SDK
import textwrap  # Embed the guest-side FUSE script as a string

# Minimal FUSE filesystem served inside the box (as a multi-line string)
FUSE_SCRIPT = textwrap.dedent(r"""
    #!/usr/bin/env python3  # Guest-side shebang
    import os, sys, time, stat  # Stdlib imports inside guest
    from mfusepy import FUSE, Operations  # FUSE bindings inside guest

DorianZheng

Latency Comparison Numbers
--------------------------
L1 cache reference/hit                       1.5 ns                      4 cycles
Floating-point add/mult/FMA operation        1.5 ns                      4 cycles
L2 cache reference/hit                       5   ns                      12 ~ 17 cycles
Branch mispredict                            6   ns                      15 ~ 20 cycles
L3 cache hit (unshared cache line)          16   ns                      42 cycles
L3 cache hit (shared line in another core)  25   ns                      65 cycles
Mutex lock/unlock                           25   ns
L3 cache hit (modified in another core)     29   ns                      75 cycles