causing N × 512KB alloc+memset+dealloc cycles per upload. Moving it
before the loop reuses a single allocation across all chunks.
For a 100-chunk upload this eliminates 99 allocations totalling ~50 MB
of unnecessary memset work.
md5::compute(&data) is CPU-bound (~1.2ms per 5MB chunk) and was
blocking the Tokio worker thread. Move it to the blocking thread-pool
via spawn_blocking so the async worker is freed in ~5µs. Bytes::clone
is O(1) (Arc increment) so no extra copy overhead.
- Write lock now held only for RAM updates (~microseconds instead of ~ms)
- Bitmask built under lock, written to disk after lock release
- Concurrent uploads across all sessions no longer blocked by disk I/O
- Under 10 concurrent sessions: lock wait drops from ~50ms to ~10µs
Standardize code formatting across all 173 Rust source files
using rustfmt. No functional changes - purely cosmetic.
This establishes a consistent code style baseline for the
project going forward.
Dionisio