Ted Ross created PROTON-1687:
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Summary: Improve efficiency of the transport output buffer
Key: PROTON-1687
URL: https://issues.apache.org/jira/browse/PROTON-1687
Project: Qpid Proton
Issue Type: Improvement
Components: proton-c
Affects Versions: proton-c-0.18.0
Reporter: Ted Ross
As the size of the transport output buffer grows due to production of
deliveries sent through pn_link_send, the amount of time that the CPU spends in
memmove becomes a problem.
It appears (dispatcher.c - pn_dispatcher_output) that whenever a block of data
is removed from the buffer, the remainder of the data in the buffer is shifted
down using memmove. If the buffer contains a large amount of data (100s of
megabytes), the sending process may spend several minutes doing almost nothing
but running memmove.
Some data:
(credit window of 250, unlimited session window, 1 MB payload)
- 10 messages, .251 sec, 40 deliveries/sec
- 20 messages, 1.267s, 16 dlv/s
- 40 messages, 6s, 7 dlv/s
- 80 messages, 28s, 3 dlv/s
- 160 messages, 138s, ~1 dlv/s
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