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Posted to dev@qpid.apache.org by "Steve Huston (JIRA)" <qp...@incubator.apache.org> on 2009/10/16 17:35:31 UTC
[jira] Created: (QPID-2150) Excessive warnings about Timer woken up
late on Windows
Excessive warnings about Timer woken up late on Windows
-------------------------------------------------------
Key: QPID-2150
URL: https://issues.apache.org/jira/browse/QPID-2150
Project: Qpid
Issue Type: Improvement
Components: C++ Broker
Affects Versions: 0.6
Environment: Windows
Reporter: Steve Huston
Fix For: 0.6
The C++ broker when running on Windows, shows a lot of warning messages like:
2009-10-15 21:48:37 warning Timer woken up 15ms late
The lateness is usually between 10 and 15 msec, owing to the relative imprecision in waking up a thread on Windows. I have two suggestions for resolving this:
1. Change the message from warning to debug. I'm a bit concerned that, regardless of platform, if users of a product where speed is an issue start seeing messages about timers waking up late, they may be concerned, without any cause probably. I'm thinking that the only people interested in this message are those diagnosing things who may want to enable debug messages.
2. Allow a platform-specific value for the threshold at which lateness prompts a message. For example, the current 10 msec limit is tighter than is useful for Windows - 30msec would be better.
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[jira] Resolved: (QPID-2150) Excessive warnings about Timer woken
up late on Windows
Posted by "Steve Huston (JIRA)" <qp...@incubator.apache.org>.
[ https://issues.apache.org/jira/browse/QPID-2150?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steve Huston resolved QPID-2150.
--------------------------------
Resolution: Fixed
Assignee: Steve Huston
Thanks very much for the quick feedback, Andrew. Changed the threshold to 50 msec, left log level alone. Fixed in trunk r826093.
> Excessive warnings about Timer woken up late on Windows
> -------------------------------------------------------
>
> Key: QPID-2150
> URL: https://issues.apache.org/jira/browse/QPID-2150
> Project: Qpid
> Issue Type: Improvement
> Components: C++ Broker
> Affects Versions: 0.6
> Environment: Windows
> Reporter: Steve Huston
> Assignee: Steve Huston
> Fix For: 0.6
>
>
> The C++ broker when running on Windows, shows a lot of warning messages like:
> 2009-10-15 21:48:37 warning Timer woken up 15ms late
> The lateness is usually between 10 and 15 msec, owing to the relative imprecision in waking up a thread on Windows. I have two suggestions for resolving this:
> 1. Change the message from warning to debug. I'm a bit concerned that, regardless of platform, if users of a product where speed is an issue start seeing messages about timers waking up late, they may be concerned, without any cause probably. I'm thinking that the only people interested in this message are those diagnosing things who may want to enable debug messages.
> 2. Allow a platform-specific value for the threshold at which lateness prompts a message. For example, the current 10 msec limit is tighter than is useful for Windows - 30msec would be better.
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[jira] Commented: (QPID-2150) Excessive warnings about Timer woken
up late on Windows
Posted by "Andrew Stitcher (JIRA)" <qp...@incubator.apache.org>.
[ https://issues.apache.org/jira/browse/QPID-2150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12766590#action_12766590 ]
Andrew Stitcher commented on QPID-2150:
---------------------------------------
I have a couple of things to add:
1. It would make sense not to warn for times less than the timer resolution. I didn't do this mostly due to laziness!
2. Really the timer code doesn't have any idea what the real criteria for warning is as it doesn't know what constraints the Timer clients are running under. So the warning is set fairly tight.
Given that the timer isn't being used for anything very sensitive to small delays putting the warning up to 30ms or even 50ms wouldn't be a problem for all platforms.
> Excessive warnings about Timer woken up late on Windows
> -------------------------------------------------------
>
> Key: QPID-2150
> URL: https://issues.apache.org/jira/browse/QPID-2150
> Project: Qpid
> Issue Type: Improvement
> Components: C++ Broker
> Affects Versions: 0.6
> Environment: Windows
> Reporter: Steve Huston
> Fix For: 0.6
>
>
> The C++ broker when running on Windows, shows a lot of warning messages like:
> 2009-10-15 21:48:37 warning Timer woken up 15ms late
> The lateness is usually between 10 and 15 msec, owing to the relative imprecision in waking up a thread on Windows. I have two suggestions for resolving this:
> 1. Change the message from warning to debug. I'm a bit concerned that, regardless of platform, if users of a product where speed is an issue start seeing messages about timers waking up late, they may be concerned, without any cause probably. I'm thinking that the only people interested in this message are those diagnosing things who may want to enable debug messages.
> 2. Allow a platform-specific value for the threshold at which lateness prompts a message. For example, the current 10 msec limit is tighter than is useful for Windows - 30msec would be better.
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