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https://issues.apache.org/jira/browse/TS-1405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13625492#comment-13625492
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taorui commented on TS-1405:
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On 04/08/2013 11:27 PM, John Plevyak (JIRA) wrote:
yes, on an unloaded system, there exists the problem you have mentioned.
should we add a trigger
mechanism to wake up the thread from epoll_wait for disk io event ? I
chose the scheme for it is easy-implemented.
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https://issues.apache.org/jira/browse/TS-1405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13625460#comment-13625460
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John Plevyak commented on TS-1405:
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The patch includes:
+#if AIO_MODE == AIO_MODE_NATIVE
+#define AIO_PERIOD -HRTIME_MSECONDS(4)
+#else
Even if it was set to zero, on an unloaded system it would only get
polled every 10 msecs because that is the poll rate for epoll(), so
you could potentially delay a disk IO by that amount of time.
> apply time-wheel scheduler about event system
> ----------------------------------------------
>
> Key: TS-1405
> URL: https://issues.apache.org/jira/browse/TS-1405
> Project: Traffic Server
> Issue Type: Improvement
> Components: Core
> Affects Versions: 3.2.0
> Reporter: Bin Chen
> Assignee: Bin Chen
> Fix For: 3.3.2
>
> Attachments: linux_time_wheel.patch, linux_time_wheel_v10jp.patch,
> linux_time_wheel_v11jp.patch, linux_time_wheel_v2.patch,
> linux_time_wheel_v3.patch, linux_time_wheel_v4.patch,
> linux_time_wheel_v5.patch, linux_time_wheel_v6.patch,
> linux_time_wheel_v7.patch, linux_time_wheel_v8.patch,
> linux_time_wheel_v9jp.patch
>
>
> when have more and more event in event system scheduler, it's worse. This is
> the reason why we use inactivecop to handler keepalive. the new scheduler is
> time-wheel. It's have better time complexity(O(1))
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