Oleg Kalnichevski commented on HTTPCORE-509:

{quote}Now, I'm wondering if I should file an issue with HTTP Components Async 
Client asking for a system parameter.
@[~elijah] You could but you would end up talking to the same bunch of people 
(us). There is no need to do anything about HttpAsyncClient. One can just 
upgrade its HttpCore dependency.


> AVAIL_PROCS is autoconfigured based on core count
> -------------------------------------------------
>                 Key: HTTPCORE-509
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-509
>             Project: HttpComponents HttpCore
>          Issue Type: Improvement
>          Components: HttpCore NIO
>    Affects Versions: 4.4.9
>            Reporter: Elijah Zupancic
>            Priority: Major
> In [IOReactorConfig:39|
> https://github.com/apache/httpcomponents-core/blob/92c4c6ff64a9a4a0b0677338c03ebd24bfe1b219/httpcore-nio/src/main/java/org/apache/http/impl/nio/reactor/IOReactorConfig.java#L39
> ], the default value for thread count is based on the detected cores on the 
> system. This is usually acceptable. However, if the library is being run 
> within a container where the reported number of CPUs does not match the 
> actual amount of CPU available, you will see too many threads created in the 
> pool leading to performance degradation.
> Of course a direct user of this library will be able to set this value to a 
> sensible number. However, you will typically see httpcore-nio 4-5 steps down 
> the dependency graph and it is being used by other open source components 
> which in turn are being used by other components.
> I would suggest that we optionally read a system parameter for the value of 
> AVAIL_PROCS. If that system parameter is not available, then we use the value 
> of Runtime.getRuntime().availableProcessors();

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