A modern (database) engine that does millions of IOPS and uses a single (or a few) IO completion polling threads, typically pinned on dedicated CPUs, instead of having all CPUs busy handling “random” IO completion interrupts. Such apps tend to use thread-per-core architecture and have their own IO queues and dispatchers built in the app layer.
Examples: ScyllaDB, RedPanda. Both are using the Seastar framework for scheduling and IO.
