Clifford Jansen created PROTON-2146:
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Summary: Reduce memory per connection
Key: PROTON-2146
URL: https://issues.apache.org/jira/browse/PROTON-2146
Project: Qpid Proton
Issue Type: Improvement
Components: proton-c
Affects Versions: proton-c-0.29.0
Reporter: Clifford Jansen
Assignee: Clifford Jansen
The transport currently starts with 2 16K buffers: one for input and one for
output, and they grow from there depending on load.
Instrumenting with Quiver and Qpid dispatch router shows that these starting
buffer sizes can be reduced to 8K without detectable performance degradation.
This can reduce memory load by close to 16K per connection for processes with
large numbers of lightly loaded connections. Connections with heavier load will
still grow as large as before, but with one extra 8K->16K growth step in buffer
size.
Reducing to 4K does lead to a degradation of several percent and further
reductions to 2K leads to a degradation closer to 20%. So smaller starting
sizes are not considered for now, but reworking the transport growth strategy
might make it possible in future.
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