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https://issues.apache.org/jira/browse/DISPATCH-1352?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Francesco Nigro updated DISPATCH-1352:
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Description:
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.
was:
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; solving it will bring a huge performance improvement to make the
router able to scale better.
> 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
>
>
> 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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