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PROFILING.md

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Profiling ztunnel

CPU

  1. Port-forward admin port (15000):
k port-forward -n istio-system ztunnel-qkvdj 15000:15000
  1. Either open localhost:15000 in a browser for help, or just curl the CPU profile:
curl localhost:15000/debug/pprof/profile > profile.prof
  1. Observe in your tooling of choice, such as flamegraph

Memory

  1. Build ztunnel with the jemalloc feature (disabled by default, see Cargo.toml)

  2. Port-forward admin port (15000):

k port-forward -n istio-system ztunnel-qkvdj 15000:15000
  1. Either open localhost:15000 in a browser for help, or just curl the memory profile:
curl localhost:15000/debug/pprof/heap > mem.pb.gz
  1. If working remotely, copy container binaries to local path for symbol resolution:
# ztunnel main binary
kubectl cp kube-system/ztunnel-qkvdj:/usr/local/bin/ztunnel ../../ztunnel-libs-pprof/ztunnel
# stdlibs (optional)
kubectl cp kube-system/ztunnel-qkvdj:/usr/lib/$BINARY_COMPILED_ARCH/ ../../ztunnel-libs-pprof/
  1. Observe in your tooling of choice, such as golang's pprof:
PPROF_BINARY_PATH=../../ztunnel-libs-pprof pprof -http=:8080 mem.pb.gz