Gordon Sim created PROTON-659:
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Summary: if protons internal buffer gets large, performance can
suffer
Key: PROTON-659
URL: https://issues.apache.org/jira/browse/PROTON-659
Project: Qpid Proton
Issue Type: Improvement
Components: proton-c
Affects Versions: 0.7
Reporter: Gordon Sim
Priority: Minor
In doing some performance investigations using qpid::messaging over 1.0, in
particular as message size got larger, I saw much lower throughput and lots of
cpu used. From callgrind it looked like this was from shuffliing up the buffer
in pn_dispatcher_output. Because of the threading in qpid::messaging, it was
possible for the application to generate too much output using the top-half of
the engine API before the IO was done for the bottom half. Fixing that in
qpid:messaging improved performance.
There may perhaps be something that proton could do to make users more aware of
this (e.g. a log message if the buffer exceeds a certain size? or just
documentation?)
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