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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="http://jira.qos.ch/browse/LOGBACK" style="color: #3b73af; text-decoration: none">logback</a> / <a href="http://jira.qos.ch/browse/LOGBACK-1141" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-improvement-8e0e4ca2-53bb-44ed-a42e-add8799e6064" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /></a> <a href="http://jira.qos.ch/browse/LOGBACK-1141" style="color: #3b73af; text-decoration: none">LOGBACK-1141</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="http://jira.qos.ch/browse/LOGBACK-1141" style="color: #3b73af; text-decoration: none">Improve logback startup time</a> </span>
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Issue Type:
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<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-improvement-8e0e4ca2-53bb-44ed-a42e-add8799e6064" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /> Improvement
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Affects Versions:
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1.1.5
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="logback-dev@qos.ch" id="email_logback-dev@qos.ch" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=logback-dev%40qos.ch" style="color:#3b73af;; color: #3b73af; text-decoration: none">Logback dev list</a>
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Components:
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logback-classic
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Created:
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26/Feb/16 4:29 AM
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Priority:
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Reporter:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="cbeams" id="email_cbeams" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=cbeams" style="color:#3b73af;; color: #3b73af; text-decoration: none">Chris Beams</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">From <a href="http://blog.javabien.net/2014/02/21/logback-can-hurt-your-startup-time/comment-page-1/#comment-338" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">Ceki's Mar 3rd, 2014 comment on the Java Bien! blog</a>:</p>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">As for logback start up time, I think that resolving the local host name might be responsible for the delay more than the class load time. In any case, I agree that 200 ms to load the logback config file may be somewhat excessive.</p>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">A few details about my application:</p>
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Without logback on the classpath, my application starts up in ~275ms.
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With logback on the classpath—and without any configuration files—my application starts up in ~375ms.
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With a logback.xml configuration on the classpath, my application starts up in ~450ms.
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">So logback is adding between 100 and 175 ms of startup time, depending on whether there is a logback.xml file present. I can deal with the initial extra 100ms, but once startup time reaches the ~450ms mark, it creates a very noticeable lag. This is a command-line application intended to be run many times per day by users, so startup time really matters.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I have not profiled the application to see where the hotspots actually lie, but if the hostname lookup is indeed a major contributor to the problem, perhaps it could be made optional.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Otherwise, anything that can be done to reduce logback startup time to a minimum would be appreciated.</p>
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