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https://issues.apache.org/jira/browse/PROTON-1550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justin Ross closed PROTON-1550.
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Resolution: Not A Problem
> Epoll proactor performance improvement
> --------------------------------------
>
> Key: PROTON-1550
> URL: https://issues.apache.org/jira/browse/PROTON-1550
> Project: Qpid Proton
> Issue Type: Improvement
> Components: proton-c
> Environment: Linux
> Reporter: Cliff Jansen
> Assignee: Cliff Jansen
> Labels: perf
> Fix For: proton-c-0.19.0
>
>
> While stress testing and evaluating performance of the epoll proactor there
> have been indications that as the number of connections increase, the
> throughput increases more slowly than overall cpu use.
> Instrumenting and profiling suggest that, at least for applications like
> qpid-dispatch, there can be a large number of simultaneous pending
> pn_connection_wake() requests for thread-safe handoff of messages from one
> connection context to another.
> As the number of connections rise, the use of adaptive spin locks for this
> purpose is suspected to be an inefficient strategy, perhaps resulting in a
> lock convoy. A trial use of one or more lockless queues could yield
> substantial performance gain or at least better understanding of current hot
> spots.
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