ASF GitHub Bot commented on ARROW-2458:

pitrou commented on issue #1893: ARROW-2458: [Plasma] Use one thread pool per 
URL: https://github.com/apache/arrow/pull/1893#issuecomment-381332975
   In other words, I think the right way of improving the plasma client here 
would be to have some global thread pool policy for Arrow. That global policy 
can provide two separate thread pools, one for CPU-bound tasks (e.g. memcpy, 
hashing or compression) and one for IO-bound tasks (such as file or network 
tasks). The CPU-bound threadpool should have, by default, the machine's number 
of HW threads (*). The IO-bound threadpool can have a multiple of that number 
(e.g. 5x).
   (*) e.g. through 

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> [Plasma] PlasmaClient uses global variable
> ------------------------------------------
>                 Key: ARROW-2458
>                 URL: https://issues.apache.org/jira/browse/ARROW-2458
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Plasma (C++)
>    Affects Versions: 0.9.0
>            Reporter: Philipp Moritz
>            Assignee: Philipp Moritz
>            Priority: Major
>              Labels: pull-request-available
> The threadpool threadpool_ that PlasmaClient is using is global at the 
> moment. This prevents us from using multiple PlasmaClients in the same 
> process (one per thread).

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