Andrew Stitcher created PROTON-591:
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Summary: There is are two large, mostly empty tables used for
dispatching incoming frames
Key: PROTON-591
URL: https://issues.apache.org/jira/browse/PROTON-591
Project: Qpid Proton
Issue Type: Improvement
Components: proton-c
Affects Versions: 0.7
Reporter: Andrew Stitcher
Assignee: Andrew Stitcher
The frame dispatch for the raw amqp and sasl layers use a table with 256
entries to lookup the handling routine for the incoming performative.
There are only 14 different performatives and there is a separate table for the
raw amqp and the sasl layer so there are in total 498 empty table entries and
only 14 actual entries.
Currently we don't need to add performatives on the fly so there is no real
need for a table that can be altered as in the current design. We can save a
lot of space and somewhat simplify the code by using a dumb switch...case
construct for the dispatch.
On a 64 bit machine this save about 4k per connection and on a 32 bit around 2k
per connection (or only 1k if the SASL layer is disabled)
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