nonblocking - ZeroMQ pattern for load balancing work across workers based on idleness -


i have single producer , n workers want give work when they're not processing unit of work , i'm struggling find zeromq pattern.

1) req/rep

the producer requestor , creates connection each worker. tracks worker busy , round-robins idle workers

problem:

  • how notified of responses , still able send new work idle workers without dedicating thread in producer each worker?

2) push/pull

producer pushes 1 socket workers feed off, , workers push socket producer listens to.

problem:

  • has no concept of worker idleness, i.e. work gets stuck behind long units of work

3) pub/sub

non-starter, since there no way make sure work doesn't lost

4) reverse req/rep

each worker req end , requests work producer , sends request when completes work

problem:

  • producer has block on request work until there work (since each recv has paired send ). prevents workers respond work completion
  • could fixed separate completion channel, producer still needs polling mechanism detect new work , stay on same thread.

5) pair per worker

each worker has own pair connection allowing independent sending of work , receipt of results

problem:

  • same problem req/rep requiring thread per worker

as zeromq non-blocking/async under hood, cannot find pattern allows code asynchronous well, rather blocking in many many dedicated threads or polling spin-loops in fewer. not use case zeromq?

your problem solved load balancing pattern in zmq guide. it's flow control whilst being able send , receive messages. producer send work requests idle workers, whilst workers able send , receive other messages @ times, e.g. abort, shutdown, etc.


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