I guess the core.async library creates a thead pool. In the library code:
(defonce the-executor
(Executors/newFixedThreadPool
(-> (Runtime/getRuntime)
(.availableProcessors)
(* 2)
(+ 42))
(conc/counted-thread-factory "async-dispatch-%d" true)))
On my machine it turns out to be 58.
On Monday, October 13, 2014 8:59:33 AM UTC-4, Nico Swart wrote:
>
> Hi Laurens,
>
> I am pretty sure (thread ...) only executes once. To check this I
> evaluated
>
> (dotimes [i 100] (log "foo"))
>
> in the REPL and the thread count goes from 23 to 80. On subsequent
> evaluations of (dotimes [i 100] (log "foo")), the count stays at 78.
>
>
> Thanks
> Nico.
>
>
> On Monday, October 13, 2014 8:43:51 AM UTC-4, Laurens Van Houtven wrote:
>>
>> Hi Nico,
>>
>>
>> Just to rule out the obvious: you’re not recompiling that namespace ever
>> time, right? Because if you call (thread …) a bunch of times, you’re gonna
>> get a bunch of threads :-)
>>
>>
>> cheers
>> lvh
>>
>>
>>
>> On 13 Oct 2014, at 14:21, Nico Swart <[email protected]> wrote:
>>
>> > I am experimenting with core.async and I am using some code from a Tim
>> Baldridge presentation:
>> >
>> > ;;;;; Logging Handler ;;;;;
>> >
>> > (def log-chan (chan))
>> >
>> > (thread
>> > (loop []
>> > (when-let [v (<!! log-chan)]
>> > (println v)
>> > (recur)))
>> > (println "Log Closed"))
>> >
>> >
>> > (close! log-chan)
>> >
>> > (defn log [msg]
>> > (>!! log-chan msg))
>> >
>> > (log "foo")
>> >
>> > If one executes (log "foo") a number of times the thread count of the
>> process increases every time this function is called. My expectation
>> > was that only one extra thread will be created in this code. Watching
>> the number of threads in Windows task manager, the threads of the process
>> > was 28, but after calling this function a number of times, the count
>> was up to 93. Is this expected behaviour ?
>> >
>> >
>> >
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