Question: When we create a channel with a transducer, who is actually doing the computation specified by the transducer? The thread that PUT to the channel? Or the thread that TAKES from the channel?

the simplest answer is the producer

the producer's logical thread (because if it is a go block it may actually get suspended and restarted elsewhere if the channel is full)

Okay, so it sounds like you’re saying that when I put a value to a channel, that operation takes care of processing the xform. And there isn’t some magical thread associated with a channel that takes care of this kind of stuff?

nope

okay, thank you!