Slow -main function termination by pmap

[Jacek Grzebyta]

Hi,

I have multi -mains project. Thus the execution looks like:

java -cp location/file.jar some.method ......

One -main method looks like:

(defn -main
  [& args]
  (let [validated (validate-args args)]
    (if (:msg validated)
      (println (st/join \newline (:msg validated)))
      (run validated))
    (log/debug "finish")))

There is nothing special in that except in the run time I have displayed the last log "finish" and the program termination is done after ~1 min later what is annoying. I found it is caused by deeply hidden pmap even if it is wrapped by doall. I thought after pmap returns results all threads are finished i.e. the main thread waits until all sub threads will be finished. If I am right what else can cause the delay? The threads pool manager?

Tanks a lot,

Jacek

[Justin Smith]

any Clojure program that uses the built in thread pools (future, agent, pmap, core.async, etc.) should call (shutdown-agents) if prompt exit is needed

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[Timothy Baldridge]

Sometimes there's some weird interop with stuff like pmap and program termination. What happens if you end your program with this function: https://clojuredocs.org/clojure.core/shutdown-agents

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“One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.”
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[Jacek Grzebyta]

That solved my problem! Thanks l lot!

Jacek

[Mike]

last line in -main should be (System/exit 0) or (shutdown-agents).

1 min awaiting it is documented behaviour of clojure.

вторник, 19 декабря 2017 г., 23:08:09 UTC+3 пользователь Justin Smith написал:

[Andy Fingerhut]

Well, this behavior is documented _somewhere_, but not in the doc string or on clojure.org that I know of (happy to be corrected if I'm wrong there).

On the ClojureDoc.org web site, the docs for pmap: http://clojuredocs.org/clojure.core/pmap

suggest looking at the docs for future for info about a 1-minute wait and how to avoid it, where there are lots of details: http://clojuredocs.org/clojure.core/future

Andy

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