f0311d8232
Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Improve scheduler's performance by eliminating sorting of nodes by their score **What this PR does / why we need it**: Profiling scheduler, I noticed that scheduler spends a significant amount of time in sorting the nodes after we score them to find nodes with the highest score. Finding nodes with the highest score does not need sorting the array. This PR replaces the sort with a linear scan. Eliminating the sort results in over 10% improvement in throughput of the scheduler. Before (3 runs for 5000 nodes, scheduling 1000 pods in a cluster running 2000 pods): BenchmarkScheduling/5000Nodes/2000Pods-12 1000 20682552 ns/op BenchmarkScheduling/5000Nodes/2000Pods-12 1000 20464729 ns/op BenchmarkScheduling/5000Nodes/2000Pods-12 1000 21188906 ns/op After: BenchmarkScheduling/5000Nodes/2000Pods-12 1000 18485866 ns/op BenchmarkScheduling/5000Nodes/2000Pods-12 1000 18457749 ns/op BenchmarkScheduling/5000Nodes/2000Pods-12 1000 18418200 ns/op **Release note**: ```release-note Improve scheduler's performance by eliminating sorting of nodes by their score. ``` |
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README.md
Kubernetes
Kubernetes is an open source system for managing containerized applications across multiple hosts; providing basic mechanisms for deployment, maintenance, and scaling of applications.
Kubernetes builds upon a decade and a half of experience at Google running production workloads at scale using a system called Borg, combined with best-of-breed ideas and practices from the community.
Kubernetes is hosted by the Cloud Native Computing Foundation (CNCF). If you are a company that wants to help shape the evolution of technologies that are container-packaged, dynamically-scheduled and microservices-oriented, consider joining the CNCF. For details about who's involved and how Kubernetes plays a role, read the CNCF announcement.
To start using Kubernetes
See our documentation on kubernetes.io.
Try our interactive tutorial.
Take a free course on Scalable Microservices with Kubernetes.
To start developing Kubernetes
The community repository hosts all information about building Kubernetes from source, how to contribute code and documentation, who to contact about what, etc.
If you want to build Kubernetes right away there are two options:
You have a working Go environment.
$ go get -d k8s.io/kubernetes
$ cd $GOPATH/src/k8s.io/kubernetes
$ make
You have a working Docker environment.
$ git clone https://github.com/kubernetes/kubernetes
$ cd kubernetes
$ make quick-release
For the full story, head over to the developer's documentation.
Support
If you need support, start with the troubleshooting guide, and work your way through the process that we've outlined.
That said, if you have questions, reach out to us one way or another.