[jira] [Commented] (PROTON-1550) Epoll proactor performance improvement
[ https://issues.apache.org/jira/browse/PROTON-1550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16280659#comment-16280659 ] Justin Ross commented on PROTON-1550: - The wakeup code does not appear to be a bottleneck after all. > Epoll proactor performance improvement > -- > > Key: PROTON-1550 > URL: https://issues.apache.org/jira/browse/PROTON-1550 > Project: Qpid Proton > Issue Type: Improvement > Components: proton-c > Environment: Linux >Reporter: Cliff Jansen >Assignee: Cliff Jansen > Labels: perf > Fix For: proton-c-0.19.0 > > > While stress testing and evaluating performance of the epoll proactor there > have been indications that as the number of connections increase, the > throughput increases more slowly than overall cpu use. > Instrumenting and profiling suggest that, at least for applications like > qpid-dispatch, there can be a large number of simultaneous pending > pn_connection_wake() requests for thread-safe handoff of messages from one > connection context to another. > As the number of connections rise, the use of adaptive spin locks for this > purpose is suspected to be an inefficient strategy, perhaps resulting in a > lock convoy. A trial use of one or more lockless queues could yield > substantial performance gain or at least better understanding of current hot > spots. -- This message was sent by Atlassian JIRA (v6.4.14#64029) - To unsubscribe, e-mail: dev-unsubscr...@qpid.apache.org For additional commands, e-mail: dev-h...@qpid.apache.org
[jira] [Commented] (PROTON-1550) Epoll proactor performance improvement
[ https://issues.apache.org/jira/browse/PROTON-1550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16158991#comment-16158991 ] Justin Ross commented on PROTON-1550: - Avoid extra memory barrier on each epoll control for IO. > Epoll proactor performance improvement > -- > > Key: PROTON-1550 > URL: https://issues.apache.org/jira/browse/PROTON-1550 > Project: Qpid Proton > Issue Type: Improvement > Components: proton-c >Affects Versions: proton-c-0.18.0 > Environment: Linux >Reporter: Cliff Jansen > Fix For: proton-c-0.18.0 > > > While stress testing and evaluating performance of the epoll proactor there > have been indications that as the number of connections increase, the > throughput increases more slowly than overall cpu use. > Instrumenting and profiling suggest that, at least for applications like > qpid-dispatch, there can be a large number of simultaneous pending > pn_connection_wake() requests for thread-safe handoff of messages from one > connection context to another. > As the number of connections rise, the use of adaptive spin locks for this > purpose is suspected to be an inefficient strategy, perhaps resulting in a > lock convoy. A trial use of one or more lockless queues could yield > substantial performance gain or at least better understanding of current hot > spots. -- This message was sent by Atlassian JIRA (v6.4.14#64029) - To unsubscribe, e-mail: dev-unsubscr...@qpid.apache.org For additional commands, e-mail: dev-h...@qpid.apache.org
