What’s the difference between the Seastar model and the reactive programming model?

Seastar futures/promises/continuations (f-p-c) are a subset of reactive programming.

Seastar performance derives from the sharded, cooperative, non-blocking, micro-task scheduled design, and f-p-c are a friendlier way of feeding tasks to the scheduler.

Seastar’s f-p-c do have some optimizations relative to other f-p-c designs. They trade off thread safety, which is unneeded due to the sharded design, for scheduling efficiency, and have a very low memory footprint.

How is Seastar different from mTCP?

mTCP is a user-level TCP stack written over DPDK (or netmap). It aims to solve many of the same problems that Seastar does, including CPU-locality of connections, unnecessary locks and sharing, and system call overhead. mTCP provides a new application API, but does not provide a new framework to manage asynchrony the way that Seastar does.

What version of DPDK does Seastar work with?

Seastar requires DPDK version 1.8.0 or later.

Is Seastar available as a package for any Linux distributions?

Not yet. If you are interested in packaging Seastar for your favorite distribution, please post to the list.

What is the Seastar license?

Seastar is open source, and released under the Apache License, Version 2.0.

Where can I ask a question not covered here?

Post to the seastar-dev mailing list.