Boosting Performance: Removing fsync from Local Storage

Sat, 09 May 2026 15:58:12 +0000

Performance gains can be substantial when understanding and carefully tuning low-level I/O operations.

For decades, fsync() has been the bedrock of data durability in POSIX-compliant systems. It’s the grumpy gatekeeper of your data, ensuring that everything you’ve written isn’t just sitting in some volatile memory buffer, waiting to vanish with the next power hiccup. This unwavering commitment to safety, however, comes at a steep performance cost. For applications where raw speed is paramount, especially within custom storage engines, the question isn’t if fsync() is a bottleneck, but how profoundly it cripples throughput. We’re going to dive deep into the mechanics of bypassing this stubborn API for local storage, understanding the trade-offs, and identifying the specific scenarios where this aggressive optimization is not just viable, but potentially revolutionary.

Database Systems on The Coders Blog

Boosting Performance: Removing fsync from Local Storage