At 10:52 05.06.2001 -0700, you wrote:
>Mark Masterson wrote:
>
>>In your example, the easiest way to achieve what you're after is to use the
>>"Threshold" parameter, common to all Appenders, and set its priority as
>>appropriate.
>
>
>Is it more performant to set the log level via the Appender or via Categories? Here's
>my example...
>
>log4j.rootCategory=WARN,A1
>
>log4j.category.com.filefish.test=DEBUG
>log4j.category.com.filefish.bar=WARN,A2
>
>log4j.appender.A1=org.apache.log4j.ConsoleAppender
>
>log4j.appender.A2=org.apache.log4j.net.SyslogAppender
>log4j.appender.A2.Threshold=DEBUG
>
>All test category messages sent to A1 and all messages sent to A2 both get logged at
>all levels. Is there anything saved by having the category check, as opposed to
>sending the message to the appender to be checked there as well?
Yes, performance hit is very significant. Filtering at the appender level involves the
following extra steps:
1) creation of a LoggingEvent,
2) its initialization,
3) a search for appenders from the hierarchy
4) synchronized call to the doAppend method of the appenders
5) return from the doAppend method after the Threshold check
My guess would be a performance factor of at least 10 but probably 100.
You don't want to do appender filtering if you can get away with category filtering.
Regards, Ceki
>rjw
>
>
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Ceki Gülcü
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