Ted Ross resolved DISPATCH-479.
    Resolution: Fixed

> 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: Ted Ross
>            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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