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https://issues.apache.org/jira/browse/PROTON-888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justin Ross updated PROTON-888:
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Component/s: proton-c
> allocate_alias linear search becomes slow at scale
> --------------------------------------------------
>
> Key: PROTON-888
> URL: https://issues.apache.org/jira/browse/PROTON-888
> Project: Qpid Proton
> Issue Type: Improvement
> Components: proton-c
> Reporter: michael goulish
> Assignee: Cliff Jansen
> Labels: perf
> Fix For: proton-c-0.19.0
>
>
> Testing that I have done recently goes to large scale on number of sessions
> per connection. I noticed that the test was slowing down rapidly over time,
> in terms of how many sessions were being established per unit time.
> The function allocate_alias in file transport.c uses a linear search through
> an array to find the next available channel number for a session (or the
> next available handle number for a link). In a usage scenario like mine in
> which many sessions will be established, this becomes very slow as the array
> fills up.
> At the beginning of my test, this function is too fast to measure. By the
> end, it is using more than 82 milliseconds per call. Overall, this function
> alone is contributing more than 20 seconds to my 3-minute test.
> This is not an unrealistic scenario -- we already have one potential customer
> who is interested in going to this kind of scale. (Which is why I was doing
> this test.)
> Maybe we can find an implementation that does not slow down the common scale,
> and yet behaves better at the high end.
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