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  1. Qpid Proton
  2. PROTON-659

if protons internal buffer gets large, performance can suffer

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    Details

    • Type: Improvement
    • Status: Open
    • Priority: Minor
    • Resolution: Unresolved
    • Affects Version/s: proton-0.7
    • Fix Version/s: None
    • Component/s: proton-c
    • Labels:

      Description

      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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              • Assignee:
                astitcher Andrew Stitcher
                Reporter:
                gsim Gordon Sim
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                • Created:
                  Updated: