| title | Java FlameGraph - Java Agent |
|---|---|
| weight | 4 |
| layout | learningpathall |
To profile a Java application with perf and ensure proper symbol resolution, you must include libperf-jvmti.so when launching the Java application.
- libperf-jvmti.so is a JVM TI agent library enabling perf to resolve Java symbols, facilitating accurate profiling of Java applications.
- A specialized shared library, libperf-jvmti.so bridges perf and the JVM, enabling proper translation of memory addresses to Java method names during profiling.
- Find and add libperf-jvmti.so to Java option
vi apache-tomcat-11.0.9/bin/catalina.sh
# add JAVA_OPTS="$JAVA_OPTS -agentpath:/usr/lib/linux-tools-6.8.0-63/libperf-jvmti.so -XX:+PreserveFramePointer"
cd apache-tomcat-11.0.9/bin
./shutdown.sh
./startup.sh- Use perf to profile Tomcat, and restart wrk if necessary
sudo perf record -g -k1 -p $(jps | awk /Bootstrap/'{print $1}') -- sleep 10- Convert the collected perf.data file into a Java flame graph using FlameGraph
git clone https://github.com/brendangregg/FlameGraph.git
export PATH=$PATH:/root/FlameGraph
sudo perf inject -j -i perf.data | perf script | stackcollapse-perf.pl | flamegraph.pl &> profile.svg- Launch profile.svg in a browser to analyse the profiling result
