Gordon Sim created PROTON-659: --------------------------------- 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?) -- This message was sent by Atlassian JIRA (v6.3.4#6332)