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Posted to dev@qpid.apache.org by "Ted Ross (JIRA)" <ji...@apache.org> on 2019/06/03 11:50:00 UTC
[jira] [Updated] (DISPATCH-1348) Avoid qdr_error_t allocation if
not necessary
[ https://issues.apache.org/jira/browse/DISPATCH-1348?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ted Ross updated DISPATCH-1348:
-------------------------------
Summary: Avoid qdr_error_t allocation if not necessary (was: Save qdr_error_t allocation if not necessary)
> Avoid qdr_error_t allocation if not necessary
> ---------------------------------------------
>
> Key: DISPATCH-1348
> URL: https://issues.apache.org/jira/browse/DISPATCH-1348
> Project: Qpid Dispatch
> Issue Type: Improvement
> Components: Routing Engine
> Affects Versions: 1.7.0
> Reporter: Francesco Nigro
> Assignee: Ganesh Murthy
> Priority: Major
> Fix For: 1.8.0
>
>
> qdr_error_from_pn on error.c is allocating qdr_error_t on the hot path ie AMQP_disposition_handler: saving those allocations would reduce CPU usage (and cache misses) on both core and worker threads, making the router able to scale better while under load.
> Initial tests has shown some improvements under load (ie with core CPU thread ~97% with the new version and ~99% with master):
> 12 pairs master (no lock-free queues, no qdr_error_t fix): 285 K msg/sec
> 12 pairs master (no lock-free queues, yes qdr_error_t fix): 402 K msg/sec
> 12 pairs lock-free q (no qdr_error_t fix): 311 K msg/sec
> 12 pairs lock-free q (yes qdr_error_t fix): 510 K msg/sec
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