[petermattis]

Yes. So far performance was worse in experiments, and the durability improvements are questionable because it is extremely difficult to get a clear understanding of the durability semantics of direct IO. If you can find a pointer to clear documentation of what those semantics are I'd be extremely interested in reading it.

[dis-sys]

RocksDB supports using Direct IO for flush and compaction (use_direct_io_for_flush_and_compaction), enabling that can improve write throughput for my workload in RocksDB. Any plan to do that in pebble?

[petermattis]

Direct IO is on our radar, though when I experimented with enabling direct IO in RocksDB it only hurt CockroachDB benchmarks. This was several years ago. I believe newer releases of RocksDB have made improvements in this area.