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--- using-jp2-to-instrument-programs-based-on-apache-felix [2011/03/02 05:19]
weiwu
+++ using-jp2-to-instrument-programs-based-on-apache-felix [2019/10/06 20:37] (current)
@@ Line 1: / Line 1: @@
-JP2 is a Java Profiler developed by Binder et al. ((W. Binder and J. Hulaas, "Using bytecode instruction counting as portable cpu consumption metric", Electronic Notes In Theoretical Computer Science, vol. 153, pp. 57-77, May 2006.)). It can be used to count the executed bytecode number to estimate the CPU consumption of a Java program.
+====== Background ======
-To do that, we need to modify the command executing the Java program like this:
+JP2 is an excellent and easy-to-use Java Profiler developed by Binder et al.((W. Binder and J. Hulaas, "Using bytecode instruction counting as portable cpu consumption metric", Electronic Notes In Theoretical Computer Science, vol. 153, pp. 57-77, May 2006.)). It can be used to count the numbers of executed bytecode instructions to estimate the CPU consumption of a Java program. The basics of calling JP2 are as follows:
 <code>
@@ Line 14: / Line 15: @@
+====== Felix and SIP ======
-Felix is an Apache implementation of the OSGi specifications which define a dynamic service deployment framework ((http://felix.apache.org/site/index.html)). The basic idea of OSGi is providing a framework on which the service implementations or bundles are plugged. The framework handles the service requests and responses. Each bundle communicates only with the framework. SIP communications is a Java VoIP and instant messaging client using Felix.
+While the previous code works well and allows instrumenting programs in most situations, we faced some difficulties when instrumenting SIP communications((http://sip-communicator.org/)). SIP Communicator is a Java VoIP and instant messaging client using Felix. Felix((http://felix.apache.org/site/index.html)) is the Apache implementation of the OSGi specifications, which defines a dynamic service deployment framework. The OSGi specifications((http://www.osgi.org/)) defines a framework on which service implementations or //bundles// are plugged and managed by the framework, independently of the underlying running JVM (and its classpath). The framework handles bundle discovery, dependencies, requests, and responses. Each bundle communicates only with/through the framework.
+We wanted to count the numbers of executed bytecode instructions of SIP communicator using JP2. When instrumenting SIP Communicator, we ran into several problems, which we fixed as follows.
+==== Not Instrumenting Felix ====
+Exclude Felix classes from being instrumented, so Felix can run without having to know about JP2. We added:
+<code>!className.startsWith("org/apache/felix")</code>
+to method:
+<code>byte[] transform(ClassLoader loader, String className, Class<?> redefiningClass, ProtectionDomain domain, byte[] uninstrumentedBytes)</code>
+in class:
+<code> ch.usi.dag.jp2.agent.SimpleTransformer </code>
+==== Telling Felix where to find JP2 for the Instrumented Bundles ====
+Add a bundle which contains all the classes of JP2 into the build.xml of SIP:
+<code>
+	<target name="bundle-jp2">
+		<jar compress="true" destfile="${bundles.dest}/bundle-jp2.jar" filesetmanifest="skip">
+			<zipfileset src="${lib.noinst}/jp2/asm-all-3.3.jar" prefix="" />
+			<zipfileset src="${lib.noinst}/jp2/bcel-5.2.jar" prefix="" />
+			<zipfileset src="${lib.noinst}/jp2/javaagent.jar" prefix="" />
+			<zipfileset src="${lib.noinst}/jp2/jp2.jar" prefix="" />
+			<zipfileset src="${lib.noinst}/jp2/jre-tool.jar" prefix="" />
+			<zipfileset src="${lib.noinst}/jp2/Thread_JP2.jar" prefix="" />
+			<zipfileset src="${lib.noinst}/jp2/thread-tool.jar" prefix="" />
+			<manifest>
+				<attribute name="Export-Package" value="ch.usi.dag.jp2.agent,ch.usi.dag.jp2.rewriting,ch.usi.dag.jp2.runtime,ch.usi.dag.jp2.tools.jre,ch.usi.dag.jp2.tools.thread" />
+				<attribute name="Bundle-Name" value="JP2" />
+				<attribute name="Bundle-Description" value="Java Instrument Library." />
+				<attribute name="Bundle-Version" value="1.0" />
+				<attribute name="System-Bundle" value="yes" />
+			</manifest>
+		</jar>
+	</target>
+</code>
+Add the JP2 bundle to felix.client.run.properties:
+<code>
+felix.auto.start.11= \
+ reference:file:lib/bundle/bundle-jp2.jar
+</code>
+==== Telling SIP Communicator Bundles about JP2 ====
+  * Add all the packages of JP2 to the Import-Package attribute of the MANIFEST.MF of all other bundles.
+  * Set org.osgi.framework.bootdelegation to JP2 classes in the execute script. The original JP2 jars in -XBootclasspath are still needed by -javaagent.
+<code>
+javabin=`which java`
+SCDIR=$WORKING-DIR
+LIBPATH=$SCDIR/lib
+BUNDLEPATH=$SCDIR/sc-bundles
+CLASSPATH=$LIBPATH/jdic_stub.jar:$LIBPATH/jdic-all.jar:$LIBPATH/felix.jar:$LIBPATH/bcprovider.jar:$SCDIR/sc-bundles/sc-launcher.jar:$SCDIR/sc-bundles/util.jar
+FELIX_CONFIG=$LIBPATH/felix.client.run.properties
+LOG_CONFIG=$LIBPATH/logging.properties
+COMMAND="$javabin -Xmx2g \
+    -javaagent:$LIBPATH/javaagent.jar \
+    -Xbootclasspath/p:$LIBPATH/Thread_JP2.jar:$LIBPATH/asm-all-3.3.jar:$LIBPATH/jp2.jar \
+    -Dch.usi.dag.jp2.Output="sip.output.gz" \
+    -Dch.usi.dag.jp2.InstrumentedClasses="sipInstrumented" \
+    -Dch.usi.dag.jp2.UninstrumentedClasses="sipUninstrumented" \
+    -Dch.usi.dag.jp2.InsterestedPackage="net.java.sip" -classpath $CLASSPATH -Dorg.osgi.framework.bootdelegation=ch.usi.* \
+    -Djna.library.path=$LIBPATH/native -Dfelix.config.properties=file:$FELIX_CONFIG -Djava.util.logging.config.file=$LOG_CONFIG \
+    net.java.sip.communicator.launcher.SIPCommunicator"
+# set add LIBPATH to LD_LIBRARY_PATH for any sc natives (e.g. jmf .so's)
+export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$LIBPATH/native
+# make LD_PRELOAD use libaoss so that java doesn't hog on the audio device.
+export LD_PRELOAD=/usr/lib/libaoss.so
+# create .sip-commnicator/log in home or otherwise java.util.logging will freak
+mkdir -p $HOME/.sip-communicator/log
+cd $SCDIR
+exec $COMMAND $*
+</code>
-While using JP2 to count the executed bytecode number of SIP communicator, we met
+Run this script to execute the instrumented SIP communicator.

Ptidej Team

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