Hi All, I've got sth I don't understand. When I define async-get-page as follows:

(defn async-get-page [i]
    (let [c (as/chan)]
      (org.httpkit.client/get (format "" i)
                              (fn [ret]
                                (as/go (as/>! c i))))
      (as/<!! c)))
  

(dotimes [i N]
    (as/go (async-get-page i)))
  

@joachim You're calling a blocking operation <!! within the calling context of a go. That blocks the go thread, of which there are only 8

return the channel from async-get-page, then call <! from within your go block

Also, (as/go (as/>! c i)) is semantically the same as (as/put! c i) except the latter is much faster and requires less memory overhead.

Right, makes sense. Thanks a lot!

you shouldn't have a go block just to put i in to a channel

(if you read the docs and look at examples, besides blocking, it is called out as the one thing not to do)

get rid of the go block there and use >!!(my preference) or put!(another option)