Greptime Blog | Greptime

Engineering•2026-08-06

Just One Function, 10x Faster? Reading a Rust Performance PR

A walkthrough of a GreptimeDB performance PR that rewrites a single function on the Prometheus remote read path. Borrowing from Arrow arrays instead of materializing strings, and moving allocation from per-row to per-series, made the RecordBatch to TimeSeries conversion 4-16x faster.

Just One Function, 10x Faster? Reading a Rust Performance PR

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