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https://issues.apache.org/jira/browse/DISPATCH-760?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ganesh Murthy closed DISPATCH-760.
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> Inefficiencies handling message annotations
> -------------------------------------------
>
> Key: DISPATCH-760
> URL: https://issues.apache.org/jira/browse/DISPATCH-760
> Project: Qpid Dispatch
> Issue Type: Bug
> Affects Versions: 0.8.0
> Environment: Fedora 25 laptop
> Single router, 8 worker threads, single receiver, single sender. Messages
> have 200 100-byte annotations.
> Reporter: Chuck Rolke
> Assignee: Chuck Rolke
> Priority: Major
> Fix For: 1.0.0
>
> Attachments: DISPATCH-760-ALL-WORKERS.svg,
> DISPATCH-760-core-thread.svg
>
>
> The router as a whole spends a lot of time managing annotations. With routers
> and other intermediaries adding and stripping annotations, improvements in
> this area could be valuable.
> Testing a stand-alone router gets these results.
> ||N 100-byte annotations || msg/S throughput||
> | 0 | 30,000 |
> | 1 | 22,500 |
> | 2 | 20,500 |
> | 5 | 15,500 |
> | 10 | 10,000 |
> | 20 | 5,500 |
> | 50 | 2,400 |
> | 100 | 1,200 |
> | 200 | 500 |
> Application 'perf' provides some visibility into where the threads are
> spending their time. View the attached .svg files to see what the core thread
> and an aggregation of the remaining threads are busy doing.
> The worker threads are spending ~85% of their time composing messages while
> the core thread is spending 90+% of its time deleting deliveries with a
> majority of its time in qd_parse_free().
> A 'top' thread snapshot shows several worker threads completely idle. The
> core thread has tid=32631.
> {noformat}
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 32633 chug 20 0 858376 137708 8484 R 26.7 0.9 0:33.99 qdrouterd
> 32632 chug 20 0 858376 137708 8484 S 20.0 0.9 0:34.63 qdrouterd
> 32631 chug 20 0 858376 137708 8484 S 13.3 0.9 0:30.13 qdrouterd
> 32635 chug 20 0 858376 137708 8484 R 13.3 0.9 0:34.26 qdrouterd
> 32636 chug 20 0 858376 137708 8484 S 13.3 0.9 0:34.80 qdrouterd
> 32638 chug 20 0 858376 137708 8484 S 13.3 0.9 0:34.34 qdrouterd
> 32616 chug 20 0 858376 137708 8484 S 6.7 0.9 0:35.48 qdrouterd
> 32634 chug 20 0 858376 137708 8484 S 6.7 0.9 0:34.09 qdrouterd
> 32637 chug 20 0 858376 137708 8484 S 6.7 0.9 0:34.42 qdrouterd
> {noformat}
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