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I am actually using it in production as an easy mechanism to add non critical rpc calls between services. The only thing I can say about it is that zeromq hasn't given me a reason to look for a replacement. Yet.

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I believe that zeromsg does not support true zero-copy messaging which might be a reason to look at nanomsg or nng if you need every last ounce of performance.

nice, we're also using it for rpc calls using protobuffs.

Did exactly the same in a previous job but used flatbuffers for serialization instead.

I wasn't a part of the initial decision making but was pretty happy with how easy it was to work with both zmq and flatbuffers.

The fact that it just works, and very easy to add endpoints, made it a no-brainer. I might not leave it alone with my kids but it works great as an RPC pipe.

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