Lorenz Quack created QPID-6697:
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Summary: Give IO thread pools a minimum/maximum size and provide
advice to user to help them select sensible values
Key: QPID-6697
URL: https://issues.apache.org/jira/browse/QPID-6697
Project: Qpid
Issue Type: Improvement
Components: Java Broker
Reporter: Lorenz Quack
Priority: Critical
Informal performance tests against the Java Broker revealed that on a machine
with a small number of cores, we needed to raise the number of threads in the
virtualhost IO pool to allow the performance of the system to match that of
0.32. For this use case/hardware defaulting to numberOfCores is a poor choice.
We recognize that there is no algorithm that will select the ideal thread
pool size for all use-cases on all hardware.
We want to:
* Replace current pool size attribute with two attributes minimum and maximum
thread pool sizes for the Broker/Virtualhost IO pool sizes defaulted from
context vars. defaulted as follows: For VH minPoolSize =
Math.min(numberOfCores, 8)... max = Math.max(numberOfCores*2, 64), for Ports
default to min=2, max=8.
* Extend the Port and Virtualhost UI to allow these values to be changed. The
UI changes should be extended to the Http Ports too.
* document the settings + give the information the user needed to adjust these
values sensibly.
* append the number of cores to the platform message (BRK-1010 : Platform ...
cores : x) and extend the Broker model to have a new derived attribute
numberOfCores. We will use this information is support calls to help advise
customer to raise/lower pool sizes.
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