# kubernetes-sigs/kube-scheduler-simulator

The simulator for the Kubernetes scheduler

Repository: https://github.com/kubernetes-sigs/kube-scheduler-simulator
Canonical: https://ross.abutalabs.com/products/kube-scheduler-simulator
Language: Go
License: Apache-2.0
License Family: permissive
Topics: k8s-sig-scheduling
Last push: 2025-09-21T04:10:12+00:00

## Health v2 (maintenance only)
Score: 42/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 43, release rhythm 8, longevity 100
- inputs: {"age_days": 1842, "days_push": 346, "days_rel": 662, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1095, forks 173 (observed 2026-08-28T04:03:34.073331+00:00)

## What it is
A simulator for the Kubernetes kube-scheduler that runs a fake KWOK-powered cluster with a debuggable scheduler. It annotates Pods with detailed per-plugin scheduling decisions so users can test scheduler configurations, plugins, and extenders.

## Use cases
- test custom kubernetes scheduler plugins before deploying
- debug why pods are scheduled onto certain nodes
- evaluate KubeSchedulerConfiguration changes safely
- simulate scheduler extenders without a real cluster
- inspect per-plugin filter and scoring results for pods
- experiment with scheduling behavior on a fake cluster

## When to choose
- you are developing or customizing a kube-scheduler plugin or configuration
- you need visibility into scheduler decisions without control-plane log access
- you want to validate scheduling behavior on a lightweight fake cluster

## When to avoid
- you need to simulate real workloads with actual resource consumption
- you want production scheduling or performance benchmarking of a real cluster

## Facets
- artifact type: service
- maturity: active
- function: simulation, monitoring, developer-tools, http-server
- domain: developer-tools, microservices
- platform: go, self-hosted
- tags: kubernetes, kube-scheduler, scheduling-framework, kwok, debugging, sig-scheduling, containers, automation, docker, web-server

## Member repositories
- kubernetes-sigs/kube-scheduler-simulator (main) score 42

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:34.073331+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:47:15.845197+00:00, confidence not recorded.
  - readme: https://github.com/kubernetes-sigs/kube-scheduler-simulator (fetched 2026-08-28T04:03:34.073331+00:00, sha 593041dd5a3a)
- Data as of 2026-08-30T08:39:29.467469+00:00.