cpu high

[chensunny]

Is this a request for help? (If yes, you should use our troubleshooting guide and community support channels, see https://kubernetes.io/docs/tasks/debug-application-cluster/troubleshooting/.):

What keywords did you search in NGINX Ingress controller issues before filing this one? (If you have found any duplicates, you should instead reply there.):

---

Is this a BUG REPORT or FEATURE REQUEST? (choose one):

NGINX Ingress controller version:
nginx-ingress-controller:0.19.0

Kubernetes version (use kubectl version):

Client Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.2+coreos.0", GitCommit:"b427929b2982726eeb64e985bc1ebb41aaa5e095", GitTreeState:"clean", BuildDate:"2018-01-18T22:56:14Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.2+coreos.0", GitCommit:"b427929b2982726eeb64e985bc1ebb41aaa5e095", GitTreeState:"clean", BuildDate:"2018-01-18T22:56:14Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"linux/amd64"}
Environment:

• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others:
  Linux szdc-k8sm-2-2.meitu-inc.com 4.4.108-1.el7.elrepo.x86_64 Basic structure  #1 SMP Mon Dec 25 09:55:39 EST 2017 x86_64 GNU/Linux

What happened:
process nginx-ingress-controller cpu high while use wrk benchmark

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know:

[chensunny]

[chensunny]

it case by collect metrics while parse json

[JordanP]

How high? Like 100% of a cpu core, 25% ? What's the hardware spec ?

[chensunny]

How high? Like 100% of a cpu core, 25% ? What's the hardware spec ?

24 core , nginx （24 worker） almost use 1000%cpu, nginx-ingress-controller almost use 300% in begin, laster 200%.

it`s easy to recurrent

[aledbf]

@chensunny please use quay.io/kubernetes-ingress-controller/nginx-ingress-controller:dev to test the fix
Also, can you also post the plain table from pprof? (the svg is nice but I don't see any numbers there)