Hi Maatary,
On Sun, Oct 11, 2015 at 9:27 PM, Maatary Okouya <[email protected]>
wrote:
> Hi,
>
> As I understood that the fork-join-executor is the default dispatcher
> when non is provided when creating the actor system
> Can someone explain me the following:
>
>
> 1. fork-join-executor {
> 2. # Min number of threads to cap factor-based parallelism number to
> 3. parallelism-min = 8
> 4.
> 5. # The parallelism factor is used to determine thread pool size
> using the
> 6. # following formula: ceil(available processors * factor). Resulting
> size
> 7. # is then bounded by the parallelism-min and parallelism-max values.
> 8. parallelism-factor = 3.0
> 9.
> 10. # Max number of threads to cap factor-based parallelism number to
> 11. parallelism-max = 64
> 12.
> 13. # Setting to "FIFO" to use queue like peeking mode which "poll" or
> "LIFO" to use stack
> 14. # like peeking mode which "pop".
> 15. task-peeking-mode = "FIFO"
> 16. }
>
>
> ALthough i understand each word, i don't understand the full semantic of
> what is explained here.
>
>
> - What does mean ceil ? in ceil(available processors * factor)
>
In short: "Rounded up":
https://www.google.se/search?q=ceil
> - What means factor-based parallelism ?
>
It means that the factor given in "parallelism-factor" will be what the
available number of processors will be multiplied with.
Scenario:
available processors = 4
parallelism-factor = 0.6
ceil(4 * 0.6) == 3
this means that the resulting desired parallelism is 3
Does that make sense?
>
> Can someone overall explain to me in english what means the configuration
> above. By reading many post here and there, i had somewhat understood that
> by default, akka, would set up a threadPoolexecutor that allocate and
> thread per core. Hence if you have 2 two core processor, you would end up
> with 4 threads. Which is how much parallel you can really be anyway. Above
> that it is concurrent but not full strictly speaking parallel. Although
> that is another issue.
>
>
> So if someone could explain the above configuration in term of processor
> and core and the resulting number of threads with 2 examples of machine
> (per their processor configuration) that would be great.
>
> --
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--
Cheers,
√
--
>>>>>>>>>> Read the docs: http://akka.io/docs/
>>>>>>>>>> Check the FAQ:
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
>>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user
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