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Posted to dev@qpid.apache.org by "Francesco Nigro (JIRA)" <ji...@apache.org> on 2019/05/30 07:53:00 UTC

[jira] [Created] (DISPATCH-1348) Save qdr_error_t allocation if not necessary

Francesco Nigro created DISPATCH-1348:
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             Summary: Save 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


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%):
5 pairs with master - 490 K msg/sec
5 pairs with new version - 530 K msg/sec



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