Ensure that perf is installed
sudo apt-get install linux-tools-common linux-tools-generic linux-tools-`uname -r`
Clone a copy of Brendan Gregg's awesome FlameGraph repository
git clone --depth=1 https://github.com/brendangregg/FlameGraph
Run linkerd-tcp under linux perf samplerate
RUST_BACKTRACE=full perf record -g -F 999 target/release/linkerd-tcp example.yml
Send it traffic through your favorite load tester.
slow_cooker_linux_amd64 -H 'default' -totalRequests 1000000 -qps 10 -concurrency 100 http://proxy-test-4e:7474/
Once your load test is complete, use the linkerd-tcp admin port to shutdown the process.
curl -X POST http://localhost:9989/shutdown
Build your flamegraph
perf script | stackcollapse-perf.pl | rust-unmangle.sh | flamegraph.pl > linkerd-tcp-flame.svg
Copy linkerd-tcp-flame.svg to your local machine and dig in with a
SVG viewer like Gapplin
for the Mac.
When setting a sample rate (-F), remember that the Nyquist theorem tells us
that to see events which happen at a rate of N you'll need to sample with a
rate of 2N.