ZeroMQ

[cordite]

I recently had some pleasant experience with ZeroMQ, http://www.zeromq.org/

I do not have personal experience with MPI, though my associates have.

The only thing I know about ZeroMQ's internals when making a cmake build setup was that it uses C++ though its interface is C with opaque pointers and has status code functions.

ZeroMQ has in process, inter-process, and normal networked TCP communications as well as pragmatic multicasting with the same interface, how likely is it to have at least the first two on epiphany cores?

[fmotta]

[cordite]

I suppose there is some overhead with the sharing and all, though it's an awesome lib that has (for reasons why the name starts with zero) practically minimal overhead.
It uses lock free datastructures, so one thing that epiphany would need to support if this were to be ported to such an architecture is support for lock free instructions, like the CMPXCHG opcode from x86

[fmotta]

[cordite]

There does exist zero-copy stuff, but that's not the default, it will copy mostly.

The creators often talked about how they would like it if something like zeromq became part of the linux kernel (quite frankly it is amazingly simple to use) in the interviews.