Ken Giusti created DISPATCH-2251:
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Summary: optimize qd_compose_insert_string_iterator
Key: DISPATCH-2251
URL: https://issues.apache.org/jira/browse/DISPATCH-2251
Project: Qpid Dispatch
Issue Type: Improvement
Components: Router Node
Affects Versions: 1.17.0
Reporter: Ken Giusti
Assignee: Ken Giusti
Fix For: 1.18.0
Attachments: qdr_perf_worker_134462_134462.svg,
qdr_perf_worker_38506_38506.svg
Analysis of perf data for the receive path of a inter-router connection
downstream router shows that qd_compose_insert_string_iterator calls are
expensive. This is due to the way qd_compose_insert_string_iterator copies
data from the iterator: byte by byte.
Refactoring qd_compose_insert_string_iterator to use qd_iterator_copy and
qd_compose_insert_string_n will leverage memmove semantics and will improve
performance (see attached flamegraphs: 134462 current vs 38506 w/optimization)
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