This guide describes how to use volcano scheduler to support gang-scheduling in Kubeflow, to allow jobs to run multiple pods at the same time.
Running jobs with gang-scheduling
To use gang-scheduling, you have to install volcano scheduler in your cluster first as a secondary scheduler of Kubernetes and configure operator to enable gang-scheduling.
- Volcano’s scheduler repo is here and check how to install it here.
- Take tf-operator for example, enable gang-scheduling in tf-operator by setting true to
Note: Volcano scheduler and operator in Kubeflow achieve gang-scheduling by using pdb. operator will create the pdb of the job automatically. You can know more about pdb here.
The yaml to use volcano scheduler to schedule your job as a gang is the same as non-gang-scheduler, for example.
apiVersion: "kubeflow.org/v1beta1" kind: "TFJob" metadata: name: "tfjob-gang-scheduling" spec: tfReplicaSpecs: Worker: replicas: 1 template: spec: containers: - args: - python - tf_cnn_benchmarks.py - --batch_size=32 - --model=resnet50 - --variable_update=parameter_server - --flush_stdout=true - --num_gpus=1 - --local_parameter_device=cpu - --device=gpu - --data_format=NHWC image: gcr.io/kubeflow/tf-benchmarks-gpu:v20171202-bdab599-dirty-284af3 name: tensorflow resources: limits: nvidia.com/gpu: 1 workingDir: /opt/tf-benchmarks/scripts/tf_cnn_benchmarks restartPolicy: OnFailure PS: replicas: 1 template: spec: containers: - args: - python - tf_cnn_benchmarks.py - --batch_size=32 - --model=resnet50 - --variable_update=parameter_server - --flush_stdout=true - --num_gpus=1 - --local_parameter_device=cpu - --device=cpu - --data_format=NHWC image: gcr.io/kubeflow/tf-benchmarks-cpu:v20171202-bdab599-dirty-284af3 name: tensorflow resources: limits: cpu: '1' workingDir: /opt/tf-benchmarks/scripts/tf_cnn_benchmarks restartPolicy: OnFailure
About volcano scheduler and gang-scheduling
With using volcano scheduler to apply gang-scheduling, a job can run only if there are enough resources for all the pods of the job. Otherwise, all the pods will be in pending state waiting for enough resources. For example, if a job requiring N pods is created and there are only enough resources to schedule N-2 pods, then N pods of the job will stay pending.
Note: when in a high workload, if a pod of the job dies when the job is still running, it might give other pods chance to occupied the resources and cause deadlock.
If you keep getting problems related to RBAC in your volcano scheduler.
You can try to add the following rules into your clusterrole of scheduler used by volcano scheduler.
- apiGroups: - '*' resources: - '*' verbs: - '*'
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