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http://jira.qos.ch/browse/LBCLASSIC-88?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=10919#action_10919
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Joern Huxhorn commented on LBCLASSIC-88:
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Wouldn't it be possible to retrieve System.currentTimeMillis and
System.nanoTime() once upon application start and then use those values to
calculate precise (non-relative) currentTimeMillis from subsequent nanoTime()
calls and the initial values?
Seems a reasonable thing to do and be a smaller change since it could work with
existing LoggingEvents. Or are we aiming for sub-milli precision concerning
logging events?
> Use System.nanoTime() instead of System.currentTimeMillis() for LogEvent
> timestamp
> ----------------------------------------------------------------------------------
>
> Key: LBCLASSIC-88
> URL: http://jira.qos.ch/browse/LBCLASSIC-88
> Project: logback-classic
> Issue Type: Improvement
> Affects Versions: 0.9.12
> Reporter: Thorbjoern Ravn Andersen
> Assignee: Logback dev list
> Priority: Minor
>
> Apparently the System.nanoTime() is better suited than
> System.currentTimeMillis() for the relative time measurements done in
> logback, plus hopefully the resolution is finer giving more reliable figures
> for small operations. Apparently the currentTimeMillis resolution is 15 ms
> under XP where the nanoTimer is much finer. Under OS X both have a
> resolution of 1 ms.
> As logback requires Java 5 where this is standard, it would be simple to make
> the switch.
> Note:
> http://www.techper.net/2008/08/10/systemcurrenttimemillis-systemnanotime-and-their-resolution/
> lists that it may be relevant to create a factory for this instead of just
> hardlinking to the java runtime so it is possible to link to another time
> source:
> "A more robust timer with a 1msec resolution is LWJGL's Sys.getTime which
> uses TGT (time get time) on Windows and currentTimeMillis elsewhere."
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