Cliff Jansen created PROTON-1550:
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Summary: 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
Affects Versions: proton-c-0.18.0
Environment: Linux
Reporter: Cliff Jansen
Fix For: proton-c-0.18.0
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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