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https://issues.apache.org/jira/browse/DISPATCH-1352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16854892#comment-16854892
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Francesco Nigro edited comment on DISPATCH-1352 at 6/5/19 6:34 AM:
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[~kgiusti] [~ganeshmurthy] The first POC I've implemented hasn't worked very
well (i've pooled 3*64 byte long qd_buffer_t for each qd_message_pvt_t),
because now each qd_message is allocating 256 bytes more for the original
message (that's not using the embedded buffers to populate qd_buffer_list_t). I
will try to do the same for the src buffer and will tell you which improvements
it brings.
was (Author: [email protected]):
[~kgiusti][~ganeshmurthy] The first POC I've implemented hasn't worked very
well (i've pooled 3*64 byte long qd_buffer_t for each qd_message_pvt_t),
because now each qd_message is allocating 256 bytes more for the original
message (that's not using the embedded buffers to populate qd_buffer_list_t). I
will try to do the same for the src buffer and will tell you which improvements
it brings.
> qd_buffer_list_clone cost is dominated by cache misses
> ------------------------------------------------------
>
> Key: DISPATCH-1352
> URL: https://issues.apache.org/jira/browse/DISPATCH-1352
> Project: Qpid Dispatch
> Issue Type: Improvement
> Components: Routing Engine
> Affects Versions: 1.7.0
> Reporter: Francesco Nigro
> Priority: Major
> Attachments: screenshot-1.png, screenshot-2.png
>
>
> qd_buffer_list_clone on qd_message_copy for
> qd_message_pvt_t.ma_to_override/ma_trace/ma_ingress is dominated by cache
> misses costs:
> * to "allocate" new qd_buffer_t
> * to reference any qd_buffer_t from the source qd_buffer_list_t
> Such cost is the main reason why the core thread is having a very low IPC (<
> 1 istr/cycle) and given the single threaded nature of the router while
> dealing with it, by solving it will bring a huge performance improvement to
> make the router able to scale better.
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