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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">Re: Improve logback startup time</a> </span>
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<p style="margin: 10px 0 0 0"><a href="http://jira.qos.ch/secure/ViewProfile.jspa?name=cbeams" class="user-hover" rel="cbeams" style="color: #3b73af; text-decoration: none">Chris Beams</a> This issue is tougher than I expected. Some simple statements executed during logback initialization, e.g. loops on lists with 3 or 4 elements take 20 milliseconds, but would probably cost only a few nanoseconds later in the application lifecycle. Joran could be made to be quicker but that is not a simple undertaking.</p>
<p style="margin: 10px 0 0 0">Another way to reduce logback's impact on application start up is to skip configuration using Joran (with a configuration file that needs to be looked up) and instead configure logback programmatically with a Configurator specified under <tt>META-INF/services/ch.qos.logback.classic.spi.Configurator</tt>.<br /> In a <a href="https://github.com/qos-ch/logback/commit/cd0441f993e4da5" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">recent commit</a>, I modified BasicConfigurator to conform to the the Configurator interface. </p>
<p style="margin: 10px 0 0 0">Here is a very simple app to measure logback's impact on app start up time. </p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">public</span> class Main {
<span class="code-keyword" style="color: #000091">static</span> <span class="code-keyword" style="color: #000091">public</span> void main(<span class="code-object" style="color: #910091">String</span>[] args) <span class="code-keyword" style="color: #000091">throws</span> Exception {
<span class="code-object" style="color: #910091">long</span> start = <span class="code-object" style="color: #910091">System</span>.nanoTime();
Logger logger = LoggerFactory.getLogger(<span class="code-quote" style="color: #009100">"a"</span>);
<span class="code-object" style="color: #910091">long</span> end = <span class="code-object" style="color: #910091">System</span>.nanoTime();
<span class="code-object" style="color: #910091">long</span> diff = (end-start)/1000/1000;
<span class="code-object" style="color: #910091">System</span>.out.print(<span class="code-quote" style="color: #009100">"elapsed time in milli-seconds "</span>+diff);
}
}
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<p style="margin: 10px 0 0 0">To enable BasicConfigurator, just add the line "ch.qos.logback.classic.BasicConfigurator" in the file <tt>META-INF/services/ch.qos.logback.classic.spi.Configurator</tt>. To enable another configurator you would add its fqcn in the aforementioned services file.</p>
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