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Heterogeneous AI Computing Virtualization Middleware

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HAMi is a Cloud Native Computing Foundation Landscape project.

Supperted devices

Introduction

Heterogeneous AI Computing Virtualization Middleware (HAMi), formerly known as k8s-vGPU-scheduler, is an "all-in-one" chart designed to manage Heterogeneous AI Computing Devices in a k8s cluster. It includes everything you would expect, such as:

Device sharing: Each task can allocate a portion of a device instead of the entire device, allowing a device to be shared among multiple tasks.

Device Memory Control: Devices can be allocated a specific device memory size (e.g., 3000M) or a percentage of the whole GPU's memory (e.g., 50%), ensuring it does not exceed the specified boundaries.

Device Type Specification: You can specify the type of device to use or avoid for a particular task by setting annotations, such as "nvidia.com/use-gputype" or "nvidia.com/nouse-gputype".

Device UUID Specification: You can specify the UUID of device to use or avoid for a particular task by setting annotations, such as "nvidia.com/use-gpuuuid" or "nvidia.com/nouse-gpuuuid".

Easy to use: You don't need to modify your task YAML to use our scheduler. All your jobs will be automatically supported after installation. Additionally, you can specify a resource name other than "nvidia.com/gpu" if you prefer.

Scheduling Policy: The vGPU scheduler supports various scheduling policies, including node-level and GPU-level policies. These can be set by default through scheduler parameters, and can also be selected based on application scenarios by setting the Pod's annotation, such as "hami.io/node-scheduler-policy" or "hami.io/gpu-scheduler-policy". Both dimensions support two policies: binpack and spread.

Major Features

• Hard Limit on Device Memory.

A simple demostration for Hard Limit: A task with the following resources.

      resources:
        limits:
          nvidia.com/gpu: 1 # requesting 1 vGPU
          nvidia.com/gpumem: 3000 # Each vGPU contains 3000m device memory

will see 3G device memory inside container

• Allows partial device allocation by specifying device memory.
• Imposes a hard limit on streaming multiprocessors.
• Permits partial device allocation by specifying device core usage.
• Requires zero changes to existing programs.

Architect

HAMi consists of several components, including a unified mutatingwebhook, a unified scheduler extender, different device-plugins and different in-container virtualization technics for each heterogeneous AI devices.

Application Scenarios

1. Device sharing (or device virtualization) on Kubernetes.
2. Scenarios where pods need to be allocated with specific device memory 3. usage or device cores.
3. Need to balance GPU usage in a cluster with multiple GPU nodes.
4. Low utilization of device memory and computing units, such as running 10 TensorFlow servings on one GPU.
5. Situations that require a large number of small GPUs, such as teaching scenarios where one GPU is provided for multiple students to use, and cloud platforms that offer small GPU instances.

Quick Start

Prerequisites

The list of prerequisites for running the NVIDIA device plugin is described below:

• NVIDIA drivers >= 440
• CUDA Version > 10.2
• nvidia-docker version > 2.0
• Kubernetes version >= 1.16
• glibc >= 2.17 & glibc < 2.3.0
• kernel version >= 3.10
• helm > 3.0

Preparing your GPU Nodes

Configure nvidia-container-toolkit

Execute the following steps on all your GPU nodes.

This README assumes pre-installation of NVIDIA drivers and the nvidia-container-toolkit. Additionally, it assumes configuration of the nvidia-container-runtime as the default low-level runtime.

Please see: https://docs.nvidia.com/datacenter/cloud-native/container-toolkit/install-guide.html

Example for debian-based systems with Docker and containerd

Install the nvidia-container-toolkit

distribution=$(. /etc/os-release;echo $ID$VERSION_ID)
curl -s -L https://nvidia.github.io/libnvidia-container/gpgkey | sudo apt-key add -
curl -s -L https://nvidia.github.io/libnvidia-container/$distribution/libnvidia-container.list | sudo tee /etc/apt/sources.list.d/libnvidia-container.list

sudo apt-get update && sudo apt-get install -y nvidia-container-toolkit

Configure Docker

When running Kubernetes with Docker, edit the configuration file, typically located at /etc/docker/daemon.json, to set up nvidia-container-runtime as the default low-level runtime:

{
    "default-runtime": "nvidia",
    "runtimes": {
        "nvidia": {
            "path": "/usr/bin/nvidia-container-runtime",
            "runtimeArgs": []
        }
    }
}

And then restart Docker:

sudo systemctl daemon-reload && systemctl restart docker

Configure containerd

When running Kubernetes with containerd, modify the configuration file typically located at /etc/containerd/config.toml, to set up nvidia-container-runtime as the default low-level runtime:

version = 2
[plugins]
  [plugins."io.containerd.grpc.v1.cri"]
    [plugins."io.containerd.grpc.v1.cri".containerd]
      default_runtime_name = "nvidia"

      [plugins."io.containerd.grpc.v1.cri".containerd.runtimes]
        [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.nvidia]
          privileged_without_host_devices = false
          runtime_engine = ""
          runtime_root = ""
          runtime_type = "io.containerd.runc.v2"
          [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.nvidia.options]
            BinaryName = "/usr/bin/nvidia-container-runtime"

And then restart containerd:

sudo systemctl daemon-reload && systemctl restart containerd

Label your nodes

Label your GPU nodes for scheduling with HAMi by adding the label "gpu=on". Without this label, the nodes cannot be managed by our scheduler.

kubectl label nodes {nodeid} gpu=on

Install and Uninstall

Installation

First, you need to check your Kubernetes version by using the following command:

kubectl version

Then, add our repo in helm

helm repo add hami-charts https://project-hami.github.io/HAMi/

During installation, set the Kubernetes scheduler image version to match your Kubernetes server version. For instance, if your cluster server version is 1.16.8, use the following command for deployment:

helm install hami hami-charts/hami --set scheduler.kubeScheduler.imageTag=v1.16.8 -n kube-system

Customize your installation by adjusting the configs.

Verify your installation using the following command:

kubectl get pods -n kube-system

If both vgpu-device-plugin and vgpu-scheduler pods are in the Running state, your installation is successful.

Upgrade

Upgrading HAMi to the latest version is a simple process, update the repository and restart the chart:

helm uninstall hami -n kube-system
helm repo update
helm install hami hami-charts/hami -n kube-system

WARNING: If you upgrade HAMi without clearing your submitted tasks, it may result in segmentation fault.

Uninstall

helm uninstall hami -n kube-system

NOTICE: Uninstallation won't kill running tasks.

Submit Task

Task example

Containers can now request NVIDIA vGPUs using the `nvidia.com/gpu`` resource type.

apiVersion: v1
kind: Pod
metadata:
  name: gpu-pod
spec:
  containers:
    - name: ubuntu-container
      image: ubuntu:18.04
      command: ["bash", "-c", "sleep 86400"]
      resources:
        limits:
          nvidia.com/gpu: 2 # requesting 2 vGPUs
          nvidia.com/gpumem: 3000 # Each vGPU contains 3000m device memory （Optional,Integer）
          nvidia.com/gpucores: 30 # Each vGPU uses 30% of the entire GPU （Optional,Integer)

Exercise caution; if a task cannot fit into any GPU node (i.e., the requested number of nvidia.com/gpu exceeds the available GPUs in any node), the task will remain in a pending state.

You can now execute the nvidia-smi command in the container to observe the difference in GPU memory between vGPU and physical GPU.

WARNING:

1. if you don't request vGPUs when using the device plugin with NVIDIA images all the vGPUs on the machine will be exposed inside your container.

2. Do not set "nodeName" field, use "nodeSelector" instead.

More examples

Click here

Monitor

Get cluster overview

Monitoring is automatically enabled after installation. Obtain an overview of cluster information by visiting the following URL:

http://{scheduler ip}:{monitorPort}/metrics

The default monitorPort is 31993; other values can be set using --set devicePlugin.service.httpPort during installation.

Grafana dashboard example

Note The status of a node won't be collected before you submit a task

Benchmarks

Known Issues

• Currently, A100 MIG can be supported in only "none" and "mixed" modes.
• Tasks with the "nodeName" field cannot be scheduled at the moment; please use "nodeSelector" instead.
• Only computing tasks are currently supported; video codec processing is not supported.
• We change device-plugin env var name from NodeName to NODE_NAME, if you use the image version v2.3.9, you may encounter the situation that device-plugin cannot start, there are two ways to fix it:
  • Manually execute kubectl edit daemonset to modify the device-plugin env var from NodeName to NODE_NAME.
  • Upgrade to the latest version using helm, the latest version of device-plugin image version is v2.3.10, execute helm upgrade hami hami/hami -n kube-system, it will be fixed automatically.

Roadmap

Heterogeneous AI Computing device to support

Production	manufactor	MemoryIsolation	CoreIsolation	MultiCard support
GPU	NVIDIA	✅	✅	✅
MLU	Cambricon	✅	❌	❌
DCU	Hygon	✅	✅	❌
Ascend	Huawei	In progress	In progress	❌
GPU	iluvatar	In progress	In progress	❌
DPU	Teco	In progress	In progress	❌

• Support video codec processing
• Support Multi-Instance GPUs (MIG)

Contributing

If you're interested in being a contributor and want to get involved in developing the HAMi code, please see CONTRIBUTING for details on submitting patches and the contribution workflow.

Meeting & Contact

The HAMi community is committed to fostering an open and welcoming environment, with several ways to engage with other users and developers.

If you have any questions, please feel free to reach out to us through the following channels:

• Regular Community Meeting: Friday at 16:00 UTC+8 (Chinese)(weekly). Convert to your timezone.
  • Meeting Notes and Agenda
  • Meeting Link
• Email: refer to the MAINTAINERS.md to find the email addresses of all maintainers. Feel free to contact them via email to report any issues or ask questions.
• mailing list
• slack

License

HAMi is under the Apache 2.0 license. See the LICENSE file for details.