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From "Stefan Bodewig (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4NET-429) Pattern with Context property causes severe slowdown
Date Wed, 04 Jun 2014 15:27:01 GMT

    [ https://issues.apache.org/jira/browse/LOG4NET-429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14017765#comment-14017765
] 

Stefan Bodewig commented on LOG4NET-429:
----------------------------------------

Hmm. in that case any patch that tried to generalize laziness would become pretty convoluted.
 Let's stick with your original patch.

> Pattern with Context property causes severe slowdown
> ----------------------------------------------------
>
>                 Key: LOG4NET-429
>                 URL: https://issues.apache.org/jira/browse/LOG4NET-429
>             Project: Log4net
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.2.13
>            Reporter: Jonas Versén
>            Assignee: Dominik Psenner
>            Priority: Minor
>              Labels: performance
>         Attachments: LOG4NET-429-alternative.patch, LOG4NET-429.patch
>
>
> If you use a context property in your appenders pattern, there will be a significant
logging slowdown. In my experience anywhere from 3 to 5 times slower (this will depend on
the appender).
> I believe that as soon as you use a context property log4net will internally access the
windows user name even though it's not the property you want to access. This theory comes
from the fact that printing all properties in the pattern (including the costly property username)
compared to just printing one will slow down the logging with the same factor.
> I've made a stackoverflow question with more details as well
> http://stackoverflow.com/questions/22612286/using-log4net-context-properties-has-negative-impact-on-performance/



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