[jira] [Updated] (TS-3102) Improve memory reuse for SPDY contexts by reusing memory released by streams within in session

["Sudheer Vinukonda (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TS-3102?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sudheer Vinukonda updated TS-3102:
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    Summary: Improve memory reuse for SPDY contexts by reusing memory released by streams within in session  (was: Reuse context memory for SPDY streams within a SPDY connection to reduce large chunks of unused memory)

> Improve memory reuse for SPDY contexts by reusing memory released by streams within in session
> ----------------------------------------------------------------------------------------------
>
>                 Key: TS-3102
>                 URL: https://issues.apache.org/jira/browse/TS-3102
>             Project: Traffic Server
>          Issue Type: Improvement
>          Components: SPDY
>    Affects Versions: 5.0.1
>            Reporter: Sudheer Vinukonda
>            Assignee: Sudheer Vinukonda
>              Labels: yahoo
>             Fix For: 5.2.0
>
>         Attachments: TS-3102.diff
>
>
> In the present SPDY implementation in ATS, there is no client context reuse. Though the spdy session is reused, each stream (even the non-concurrent ones) is allocated a set of new/separate context buffers (including internal plugin_vc, client_session, SM object, header heap, transaction buffers, server session objects etc). Some of these objects are allocated from global pool, while some are from per-thread pool. The context memory is not reused unlike the non-spdy session, where there can be at most one transaction on a given connection/session at a time.
> Besides being very inefficient (the allocation/deallocation) this also leads to larger memory foot print over time, due to the relatively poor reuse of per thread pool objects (especially, when there are a high number of threads - e.g 100+ like we have).
> I am currently testing a patch that does not deallocate the streams when the transaction completes and reuses those for new/subsequent streams.



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