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kcu1500 -> PGPReader -> N*Worker -> Ric's TEB -> Collector
                                    ^^^^^^^^^-- (TEB/MEB stuff on another node)

Ideally, replace Worker threads with Worker processes
BUT, RIC's (complicated) infiniband stuff is all multithreaded

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kcu1500 -> PGPReader -> N*Worker -> Ric's TEB -> Collector
                                    ^^^^^^^^^-- (TEB/MEB stuff on another node)

each Worker has a bidirectional pipe to a separate psana process
(behaves like shmem again) where dgrams go back-and-forth: psana is
given a "raw" dgram, psana returns a "fex" dgram, e.g. with list-of-photons

Worker <---> psana

Could use zmq? bidirectional pipe? or something similar.

Advantage:
- only have to support 1 DRP

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