Clifford Jansen created PROTON-2130:
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Summary: Improve epoll_wait processing in epoll proactor
Key: PROTON-2130
URL: https://issues.apache.org/jira/browse/PROTON-2130
Project: Qpid Proton
Issue Type: Improvement
Components: proton-c
Affects Versions: proton-c-0.29.0
Reporter: Clifford Jansen
Assignee: Clifford Jansen
Change epoll proactor to use epoll_wait() more efficiently and more canonically.
Old way: each thread without work called epoll_wait() for 1 event.
New: when known work exhausted, only one thread calls epoll_wait for N events
and schedules work for the other threads to execute.
The downside to the old way is that for each event, all threads in epoll_wait()
are woken up but only one "wins" (obtaining the event to process) while the
rest go back to sleep.
In addition to wasteful use of cpu, this behavior also shows up in performance
monitoring tools and clutters the analysis of profiling data and flame graphs.
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