Jens Reimann created PROTON-1911:
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Summary: Performance issue in EncoderImpl#writeRaw(String)
Key: PROTON-1911
URL: https://issues.apache.org/jira/browse/PROTON-1911
Project: Qpid Proton
Issue Type: Improvement
Components: proton-j
Affects Versions: proton-j-0.28.0, proton-j-0.22.0
Reporter: Jens Reimann
Attachments: qpid_encode_1.png, qpid_encode_2.png, qpid_encode_3.png,
qpid_encode_4.png
While digging into performance issues in the Eclipse Hono project I noticed a
high consumption of CPU time when encoding AMQP messages using proton-j.
I made a small reproducer and threw the same profiler at it, here are the
results:
As you can see in the attach screenshot (the first is the initial run with the
current code) most of the time is consumed in EncoderImpl#writeRaw(String).
This due to the fact that is call "put" for every byte it want to encode.
The following screenshots are from a patched version which uses a small thread
local buffer to locally encode the raw data and then flush it to the buffer in
bigger chunks.
Screenshot 3 and 4 show the improve performance, but also show that the memory
consumption stays low.
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