Direct I/O Boosts HedgeDB Performance by Bypassing the Page Cache
Direct I/O (O_DIRECT) bypasses the Linux page cache, eliminating extra memory copies and asynchronous flushes. Benchmarks on HedgeDB show ~26% higher IOPS and lower tail latency compared to buffered I/O, making storage performance more predictable. The article explains the trade‑offs and how to configure the system.