Hi!

Recently I started RocksDB optimization process with PGO and have interesting results: tikv/tikv#13990 (comment) I think it would be interesting to consider building RocksDB with PGO as a TiKV dependency.

Further discussions about PGO and RocksDB are here (see the mentioned Discord chat in the discussion - all activity is in Discord): https://groups.google.com/g/rocksdb/c/j9iMFskUnpA