Debugging performance issues on Docker/Kube can be interesting....
You could try exposing the service through a Nodeport, and run your
benchmark directly against the node IP. That would at least tell you if the
GKE LB is a factor or not.
Also - are your pods possibly CPU or memory limited (i.e, have you
explicitly set resource limits - making Kube throttle your pods?)
Please share your findings!
On Tuesday, September 19, 2017 at 12:25:05 AM UTC-6, Vinoth Narasimhan
wrote:
>
> Environment:
>
> Kubernetes version (use kubectl version):
> kubectl version
> Client Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.3",
> GitCommit:"2c2fe6e8278a5db2d15a013987b53968c743f2a1", GitTreeState:"clean",
> BuildDate:"2017-08-03T07:00:21Z", GoVersion:"go1.8.3", Compiler:"gc",
> Platform:"linux/amd64"}
> Server Version: version.Info{Major:"1", Minor:"6", GitVersion:"v1.6.9",
> GitCommit:"a3d1dfa6f433575ce50522888a0409397b294c7b", GitTreeState:"clean",
> BuildDate:"2017-08-23T16:58:45Z", GoVersion:"go1.7.6", Compiler:"gc",
> Platform:"linux/amd64"}
>
> Cloud provider or hardware configuration**:
>
> Google Container Engine.
>
> What happened:
>
> We are in testing phase of springboot based microservice deployment on
> GKE. During testing QA filed a performance issue , stats that the
> throughput of the service in k8s is low when compared to run the java app in
>
> java -jar method
> docker run
> For testing i skip those springboot stuff and take native tomcat home page
> as the test bed for the "ab" testing.
>
> The test setup looks like:
>
> Create an 8cpu/30Gig RAM ubuntu server in GCP and install native
> tomact-8.5.20(80) and test the home page.
>
> Stop the native tomcat. Create the docker tomcat instances on the same
> host and test the same home page.
> The docker version is: Version: 17.06.2-ce
>
> Create the 3 node K8s cluster 1.6.9. Run the tomcat deployment the same
> 8.5.20 and expose the service through LB and test the same home page.
>
> I install the ab tool in other GCP instances and hit the above 3 different
> endpoints.
>
> What's the Result:
>
> The first 2 test with native tomcat and docker run the throughput i got is
> nearly 8k Req/sec on avg on different request/concurrent level.
>
> But the same on K8s LB the throughput i got on the average of 2k req/sec
> on avg on different request/concurrency level.
>
> Is this something am i missing on the test. Or this is how the GKE LB
> store and forward the request at this rate.
>
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