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https://issues.apache.org/jira/browse/DISPATCH-479?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Ross updated DISPATCH-479:
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Fix Version/s: 0.7.0
> Use atomic operations for ref counts
> ------------------------------------
>
> Key: DISPATCH-479
> URL: https://issues.apache.org/jira/browse/DISPATCH-479
> Project: Qpid Dispatch
> Issue Type: Bug
> Reporter: Ulf Lilleengen
> Assignee: Ulf Lilleengen
> Priority: Minor
> Fix For: 0.7.0
>
>
> I ran some profiling using perf, and on the test server hardware, the locking
> related to ref counts on delivery and message was most contended. The
> benchmark is basically send unsettled messages as fast as it can. It would be
> nice to have this reviewed for correctness, as I am quite new to dispatch
> code and probably are making some bad assumptions.
> I'm seeing ~10% improvement in throughput with this patch on the test server
> at least, but there was no noticable improvement on my laptop. It might be
> that the cost of locking is much less on newer hardware. [~mwagner] It would
> be great if you could test the patch to see if it has any effect for your
> tests.
> Another question is if/how to use atomic instructions in dispatch. If c11 is
> preferred, I can change to that, but it appears it is not available for older
> RHEL versions, so the patch uses GCC extensions.
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