log4j-core/src/test/resources/perf-log4j12.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <appender name="File" class="org.apache.log4j.FileAppender">
        <param name="File" value="perftest.log" />
        <param name="BufferedIO" value="true"/>
        <param name="Append" value="false" />
        <layout class="org.apache.log4j.PatternLayout">
          <param name="ConversionPattern" value="%d %p %c{1} [%t] %X{aKey} %m %n"/>
        </layout>           
     </appender>
  <root> 
    <priority value="debug" /> 
    <appender-ref ref="File" /> 
  </root>
</log4j:configuration>