28706699908
96%

Ran 04 Jul 2026 12:50PM UTC

Jobs 1

Files 28

Run time 1min

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Committed 04 Jul 2026 12:41PM UTC coverage: 96.714% (+0.005%) from 96.709%

Build # 28706699908

Build Type

push

github

Committed by

floatdrop

Commit Message

mem: cache-line-pad per-worker Pool headers and AccessLogs

main allocated the per-worker Pool headers (~32 bytes: free list head,
free count) and AccessLogs as plain arrays, so adjacent workers' mutable
state shared cache lines — the same false sharing the metrics sharding
removed, in a smaller dose. Invisible under keep-alive (a pool header
moves only at connection setup), but under connection churn every
request does an acquire/release on a line a neighbor worker also owns.

New src/mem/cache_line.zig: Padded(T) over-aligns the value to
std.atomic.cache_line (128: adjacent-line prefetcher), which also rounds
the array stride, so neighbors can never share a line — asserted at
comptime. The metrics shards move onto the same wrapper (drops their
hand-rolled padding field); main wraps the pools and accesses arrays.

Gate (perf stat, user-space HITM on the zoxy process, R=20k churn via
Connection: close, 8s windows, 3 alternating rounds): load xsnp_hitm
32,030/32,122/32,064 (HEAD — constant across runs = systematic
contention) -> 368/529/726 padded, ~50x; store-side RFO snoop-hitm
6.5-12.3k -> 1.0-4.0k, bands separated. Keep-alive latency/throughput
bands unchanged (p50 136-190us both, ~29.9k/s both). 150/150 tests,
sim seeds 0..200 OK.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Coverage Stats

7063 of 7303 relevant lines covered (96.71%)

0.97 hits per line

Jobs

ID	Job ID	Ran	Files	Coverage
1	28706699908.1	04 Jul 2026 12:50PM UTC	28	96.71	GitHub Action Run

floatdrop / zoxy / 28706699908
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