tmux Batches Terminal Output: One Write() Per Event Loop Iteration
Every byte tmux sends to a terminal goes through one function that appends to a per-client buffer, and that buffer is flushed with a single write() per event loop iteration.
Performance
PostgreSQL Computes Page Checksums Fast: Thirty-Two Parallel FNV-1a Hashes
The page checksum runs 32 FNV-1a hashes in parallel over a 32-column view of the page to hide multiply latency — and 32 is baked into the on-disk format.
PostgreSQL Deduplicates B-Tree Entries: Posting Lists and In-Place Splits
B-tree leaves store one posting list tuple per distinct key instead of one entry per row, and an over-long list is split in place inside the insert’s critical section.
PostgreSQL Does Async I/O with io_uring: A Closed-Loop Read-Ahead Controller
PostgreSQL 20’s AIO subsystem has an io_uring backend plus a read-ahead controller that doubles its look-ahead distance only when the backend actually had to wait for I/O.
tmux Redraws Only What Changed: Five Layers of Less Work
tmux never redraws ’the screen’ — it redraws the difference.