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Zhengchao An
21 lines
1.2 KiB
Markdown
21 lines
1.2 KiB
Markdown
# Performance Lens
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- For added clones/allocations on request/object/block paths, quantify copied
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data and frequency. Recommend borrowing, move, `Bytes`/`Arc`, `Cow`, or
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capacity reservation only for a concrete repeated cost.
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- Route every new sync/flush through the durability-mode and bucket override
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gates; mode `none` must not pay the new fsync.
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- Keep blocking filesystem/CPU work off async runtime threads, but do not split
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one small operation into many `spawn_blocking` round trips.
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- Measure lock hold time across I/O and compare acquisition order for ABBA.
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- Keep cleanup, extra stat/rename, and diagnostics out of the PUT commit critical
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section when they need not be there.
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- Detect per-item serial I/O/RPC in batch APIs and accidental quadratic scans;
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use a gate or bounded concurrency when the concrete fan-out warrants it.
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- Count buffer growth and byte copies in EC/bitrot paths; preserve pool gauge
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balance and avoid repeated metadata decode/fetch per object.
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- Repetitive success logs stay at `trace`; metrics/instrumentation on hot paths
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require an existing gate.
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- Claims of no impact on PUT/GET/commit/erasure paths need relevant benchmark or
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A/B evidence, especially for 4 KiB objects.
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