swaitsandClaude Opus 4.6
a5e3e5f63b
Benchmarking & comparison: - Add criterion benchmarks (ucobs vs cobs 0.3 vs corncobs 0.1) - Add Python cobs benchmark script - Add performance comparison section to README with full results Performance: - Rewrite encode to scan-and-bulk-copy via copy_from_slice - Rewrite decode to bulk-copy via copy_from_slice - ~2-4x throughput improvement; now matches corncobs on most workloads Quality hardening: - Add #![forbid(unsafe_code)], #![warn(missing_docs)], #[must_use] - Add [lints.rust] unsafe_code = "forbid" in Cargo.toml - Add rust-version (MSRV) = "1.56" - Add docs.rs metadata - 106 tests: 80 unit/corpus + 25 property tests (25k cases each = 625k total) - External test vectors from: Wikipedia, Cheshire & Baker paper, nanocobs, cobs-c, cobs2-rs, Jacques Fortier, Python cobs package - Add fuzz_small_dest fuzz target (encode/decode with undersized buffers) - Improve doc examples to show sentinel append/strip convention Infrastructure: - Add justfile with test (nextest), check, bench, fuzz, miri, fmt targets - cargo-nextest for parallel test execution - Update .gitignore for Python cache files Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
#!/usr/bin/env python3
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"""Benchmark Python cobs encode/decode vs ucobs (reference timing only).
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Requires: pip install cobs
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"""
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import time
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def payload_zeros(n: int) -> bytes:
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return b"\x00" * n
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def payload_nonzero(n: int) -> bytes:
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return bytes((i % 255 + 1) for i in range(n))
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def payload_mixed(n: int) -> bytes:
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return bytes(i % 256 for i in range(n))
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def bench(func, data, iterations=10_000):
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start = time.perf_counter()
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for _ in range(iterations):
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func(data)
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elapsed = time.perf_counter() - start
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return elapsed
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def main():
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try:
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from cobs import cobs as cobs_mod
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except ImportError:
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print("ERROR: python cobs package not installed. Run: pip install cobs")
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return
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sizes = [0, 1, 10, 64, 254, 255, 256, 1024, 4096]
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payloads = [
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("zeros", payload_zeros),
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("nonzero", payload_nonzero),
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("mixed", payload_mixed),
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]
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iterations = 10_000
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print(f"{'operation':<30} {'size':>6} {'iters':>7} {'total_ms':>10} {'per_op_us':>10} {'MB/s':>10}")
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print("-" * 80)
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for name, make in payloads:
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for size in sizes:
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data = make(size)
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# Encode
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elapsed = bench(cobs_mod.encode, data, iterations)
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per_op_us = (elapsed / iterations) * 1_000_000
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mbps = (size * iterations / elapsed / 1_000_000) if elapsed > 0 and size > 0 else 0
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print(f"{'python-cobs encode/' + name:<30} {size:>6} {iterations:>7} {elapsed*1000:>10.2f} {per_op_us:>10.3f} {mbps:>10.1f}")
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# Decode
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encoded = cobs_mod.encode(data)
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elapsed = bench(cobs_mod.decode, encoded, iterations)
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per_op_us = (elapsed / iterations) * 1_000_000
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mbps = (size * iterations / elapsed / 1_000_000) if elapsed > 0 and size > 0 else 0
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print(f"{'python-cobs decode/' + name:<30} {size:>6} {iterations:>7} {elapsed*1000:>10.2f} {per_op_us:>10.3f} {mbps:>10.1f}")
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if __name__ == "__main__":
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main()
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