[the8472]

If you're on the same machine then pipes, unix sockets and shared memory are even faster options.

[fulafel]

Those are transport layers, a layer beneath a RPC protocol.

[numbsafari]

It wouldn’t really be an RPC, then would it?

[the8472]

It's not a normal procedure call within the same process.

[numbsafari]

Right. Those are methods for IPC. IPC doesn't have to deal with all the same issues as RPC, and so those techniques are going to be faster as a result. You can't really compare them.

It's like comparing communication between people physically located in the same room and people located on different continents.

[the8472]

RDMA shared memory muddies that distinction.