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pprof.md

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Using pprof to connect to openstack-k8s-operators controller managers

step 1 edit CSV/disable initialization controller-operator

edit CSV and disable the initialization resource manager for openstack-controller-operator by setting replicas to 0

step 2 enable pprof bind address

add --pprof-bind-address to the deployment for the manager you want to inspect. This could be any operator. Example: infra-operator, openstack-operator, etc.

step 3 port forward

oc port-forward infra-operator-controller-manager-58b5b5cb84-mpwq2 -n openstack-operators 8082

step 4 connect pprof

go tool pprof http://localhost:8082/debug/pprof/heap

step 5 (run misc pprof commands)

useful commands:

  • top
  • list
  • web

useful modes (switch between these and run the above commands):

  • inuse_space: The amount of memory currently in use (allocated but not yet freed). This is often the most useful for identifying memory leaks.
  • inuse_objects: The number of objects currently in use.
  • alloc_space: The total amount of memory allocated over the lifetime of the application (including memory that has been freed).
  • alloc_objects: The total number of objects allocated over the lifetime of the application.

Example leak detection:

curl -s http://localhost:8082/debug/pprof/heap > heap1.prof
curl -s http://localhost:8082/debug/pprof/heap > heap2.prof
go tool pprof -http=:8081 --base heap1.prof heap2.prof