I am trying to optimise the RocksDB performance but I don’t know where the option files are.

I am looking for the Options file that contains:

This is a RocksDB option file.

For detailed file format spec, please refer to the example file
in examples/rocksdb_option_file_example.ini

DBOptions
compaction_readahead_size=0
strict_bytes_per_sync=false
bytes_per_sync=1048576
max_background_jobs=10
avoid_flush_during_shutdown=false
max_background_flushes=-1
delayed_write_rate=16777216
max_open_files=512
max_subcompactions=1

etc…

I found a couple of files within the /tmp/blockchain/chains/name/db/full called OPTIONS-OOOXX
but these files contains default settings only preset for the startup.