CPU Flame Graph

Here is an example output for this page.

Download Brendan Gregg's FlameGraph tool

git clone https://github.com/brendangregg/FlameGraph.git

Download the example jar file

wget http://blog.minzhou.info/perfj/leveldb-benchmark.jar

Run java program with frame pointer preserved

java -cp leveldb-benchmark.jar  -XX:+PreserveFramePointer org.iq80.leveldb.benchmark.DbBenchmark  –benchmarks=fillrandom  –num=100000000

Profile CPU usage by PerfJ

bin/perfj record -F 99 -g -p `pgrep -f DbBenchmark`

After a while use Ctrl+C to terminate the profiling. You will see a file named perf.data in the current working directory. Move it into FlameGraph directory.Follow below steps

sudo mv perf.data ../FlameGraph
cd ../FlameGraph
sudo perf script | ./stackcollapse-perf.pl > out.perf-folded
./flamegraph.pl out.perf-folded –colors java > perfj.svg