Elijah Zupancic created HTTPCORE-509:
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Summary: 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: Bug
Components: HttpCore NIO
Affects Versions: 4.4.9
Reporter: Elijah Zupancic
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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