Re:Show HN: Ultra-fast, embedded KV store in pure Rust
by mehrant on Saturday August 23, 2025 @03:29PM
(#44998469)
The real value isn't just raw speed - it's efficiency.
When your KV operations take 200ns instead of 20μs, you're using 100x less CPU time per operation. This translates to:
- Running the same workload on smaller/cheaper instances
- Serving 100x more users on the same hardware
- Lower cloud bills and better multi-tenancy
For desktop apps, this means your KV store barely touches the CPU, leaving resources for the actual application. For servers, it means one instance can handle what previously required a fleet.
The durability tradeoff makes sense when you realize most KV workloads are derived data that can be rebuilt. Why pay 100x the CPU cost for fsync-level durability on data that doesn't need it?
When your KV operations take 200ns instead of 20μs, you're using 100x less CPU time per operation. This translates to:
For desktop apps, this means your KV store barely touches the CPU, leaving resources for the actual application. For servers, it means one instance can handle what previously required a fleet.The durability tradeoff makes sense when you realize most KV workloads are derived data that can be rebuilt. Why pay 100x the CPU cost for fsync-level durability on data that doesn't need it?