⚡ Optimize DeflateEncoder flush buffer allocation#373
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Replaced `output.resize(bound, 0)` with `try_reserve` and `unsafe { output.set_len(bound); }` in `src/stream.rs`. This avoids zero-filling the output buffer when resizing, which is unnecessary as the compressor overwrites the buffer.
This optimization improves throughput by ~24% for large buffers (1MB) in `DeflateEncoder` benchmarks, while maintaining correctness and safety. Small buffer performance remains neutral.
Co-authored-by: 404Setup <[email protected]>
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404Setup
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Optimize
DeflateEncoder::flush_bufferby avoiding zero-initialization of the output buffer.Replaced
output.resize(bound, 0)withtry_reserveandunsafe { output.set_len(bound); }. This avoids the overhead of zero-filling the newly allocated memory, which is immediately overwritten by the compression process.Benchmark Results:
DeflateEncoder LargeBuffer(1MB buffer): Time reduced from ~1.39ms to ~1.05ms (~24% improvement).DeflateEncoder(64KB buffer): Performance remains statistically similar (within noise margin).Safety:
try_reserveensures sufficient capacity beforeset_len.compress) accept&mut [MaybeUninit<u8>]and handle uninitialized memory correctly by writing to it before reading (if any).unsafeblock usage.PR created automatically by Jules for task 2557692597190885293 started by @404Setup