added JMH benchmark

conf/logback.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE configuration>
+
+<configuration>
+    <import class="ch.qos.logback.classic.encoder.PatternLayoutEncoder"/>
+    <import class="ch.qos.logback.core.ConsoleAppender"/>
+
+    <appender name="console" class="ConsoleAppender">
+        <target>System.err</target>
+        <encoder class="PatternLayoutEncoder">
+            <pattern>%d [%highlight(%-5level)] \(%thread\) %logger{36} -%kvp- %msg %n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="info">
+        <appender-ref ref="console"/>
+    </root>
+    <logger name="io.netty" level="debug"/>
+    <logger name="com.google.code.yanf4j" level="warn"/>
+    <logger name="net.rubyeye.xmemcached" level="warn"/>
+</configuration>