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server.go
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// Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
package main
import (
"fmt"
"log"
"net"
"os"
"path"
"time"
"encoding/json"
"golang.org/x/net/context"
"google.golang.org/grpc"
pluginapi "k8s.io/kubernetes/pkg/kubelet/apis/deviceplugin/v1beta1"
"sort"
"strings"
)
const (
resourceName = "nvidia.com/gpu"
serverSock = pluginapi.DevicePluginPath + "nvidia.sock"
envDisableHealthChecks = "DP_DISABLE_HEALTHCHECKS"
allHealthChecks = "xids"
)
// NvidiaDevicePlugin implements the Kubernetes device plugin API
type NvidiaDevicePlugin struct {
devs []*pluginapi.Device
topology TopoInfo
usableDeviceMap UsableDeviceMap
socket string
stop chan interface{}
health chan *pluginapi.Device
topoChan chan *ConnectGraph
usableChan chan *UsableDeviceMap
server *grpc.Server
}
// Test: A stub, just provides a virtual gpu status
func testGetDevices() []*pluginapi.Device {
n := uint(8)
var devs []*pluginapi.Device
for i := uint(0); i < n; i++ {
switch i {
case 0:
devs = append(devs, &pluginapi.Device{
ID: "GPU-92d93cd6-e41f-6884-6748-3738a97691df",
Health: pluginapi.Healthy,
})
break
case 1:
devs = append(devs, &pluginapi.Device{
ID: "GPU-7ea160c1-73de-f6f4-1d3d-e34340d85eef",
Health: pluginapi.Healthy,
})
break
case 2:
devs = append(devs, &pluginapi.Device{
ID: "GPU-92d93cd6-e41f-6884-6748-3738a976fff1",
Health: pluginapi.Healthy,
})
break
case 3:
devs = append(devs, &pluginapi.Device{
ID: "GPU-92d93cd6-e41f-6884-6748-3738a976fff2",
Health: pluginapi.Healthy,
})
break
case 4:
devs = append(devs, &pluginapi.Device{
ID: "GPU-92d93cd6-e41f-6884-6748-3738a976fff3",
Health: pluginapi.Healthy,
})
break
case 5:
devs = append(devs, &pluginapi.Device{
ID: "GPU-92d93cd6-e41f-6884-6748-3738a976fff4",
Health: pluginapi.Healthy,
})
break
case 6:
devs = append(devs, &pluginapi.Device{
ID: "GPU-92d93cd6-e41f-6884-6748-3738a976fff5",
Health: pluginapi.Healthy,
})
break
case 7:
devs = append(devs, &pluginapi.Device{
ID: "GPU-92d93cd6-e41f-6884-6748-3738a976fff6",
Health: pluginapi.Healthy,
})
break
}
}
return devs
}
// NewNvidiaDevicePlugin returns an initialized NvidiaDevicePlugin
func NewNvidiaDevicePlugin() *NvidiaDevicePlugin {
devicesIDsAndHealth := testGetDevices()
topo := TopoInfo{nil, nil}
//devicesIDsAndHealth, topo := getDevicesAndTopology()
return &NvidiaDevicePlugin{
devs: devicesIDsAndHealth,
topology: topo,
usableDeviceMap: make(UsableDeviceMap),
socket: serverSock,
stop: make(chan interface{}),
health: make(chan *pluginapi.Device),
topoChan: make(chan *ConnectGraph),
usableChan: make(chan *UsableDeviceMap),
}
}
func (m *NvidiaDevicePlugin) GetDevicePluginOptions(context.Context, *pluginapi.Empty) (*pluginapi.DevicePluginOptions, error) {
return &pluginapi.DevicePluginOptions{
PreStartRequired: false,
PreAllocateRequired: true,
PodAnnotationsRequired: true,
}, nil
}
// dial establishes the gRPC communication with the registered device plugin.
func dial(unixSocketPath string, timeout time.Duration) (*grpc.ClientConn, error) {
c, err := grpc.Dial(unixSocketPath, grpc.WithInsecure(), grpc.WithBlock(),
grpc.WithTimeout(timeout),
grpc.WithDialer(func(addr string, timeout time.Duration) (net.Conn, error) {
return net.DialTimeout("unix", addr, timeout)
}),
)
if err != nil {
return nil, err
}
return c, nil
}
// Start starts the gRPC server of the device plugin
func (m *NvidiaDevicePlugin) Start() error {
err := m.cleanup()
if err != nil {
return err
}
sock, err := net.Listen("unix", m.socket)
if err != nil {
return err
}
m.server = grpc.NewServer([]grpc.ServerOption{}...)
pluginapi.RegisterDevicePluginServer(m.server, m)
go m.server.Serve(sock)
// Wait for server to start by launching a blocking connexion
conn, err := dial(m.socket, 5*time.Second)
if err != nil {
return err
}
conn.Close()
go m.healthcheck()
// Register Topology to kubelet
go m.registerTopology()
return nil
}
// Stop stops the gRPC server
func (m *NvidiaDevicePlugin) Stop() error {
if m.server == nil {
return nil
}
m.server.Stop()
m.server = nil
close(m.stop)
return m.cleanup()
}
// Register registers the device plugin for the given resourceName with Kubelet.
func (m *NvidiaDevicePlugin) Register(kubeletEndpoint, resourceName string) error {
conn, err := dial(kubeletEndpoint, 5*time.Second)
if err != nil {
return err
}
defer conn.Close()
client := pluginapi.NewRegistrationClient(conn)
reqt := &pluginapi.RegisterRequest{
Version: pluginapi.Version,
Endpoint: path.Base(m.socket),
ResourceName: resourceName,
Options: &pluginapi.DevicePluginOptions{
PreStartRequired: false,
PreAllocateRequired: true,
PodAnnotationsRequired: true,
},
}
_, err = client.Register(context.Background(), reqt)
if err != nil {
return err
}
return nil
}
// ListAndWatch lists devices and update that list according to the health status
func (m *NvidiaDevicePlugin) ListAndWatch(e *pluginapi.Empty, s pluginapi.DevicePlugin_ListAndWatchServer) error {
s.Send(&pluginapi.ListAndWatchResponse{Devices: m.devs})
for {
select {
case <-m.stop:
return nil
case d := <-m.health:
// FIXME: there is no way to recover from the Unhealthy state.
d.Health = pluginapi.Unhealthy
s.Send(&pluginapi.ListAndWatchResponse{Devices: m.devs})
case topo := <-m.topoChan:
data, err := json.Marshal(*topo)
if err != nil {
log.Println("ListAndWatch:: Marshal fail")
}
devicepluginAnnotation := make(map[string]string)
devicepluginAnnotation["node.dm.alpha.kubernetes.io/Topology"] = string(data)
s.Send(&pluginapi.ListAndWatchResponse{Devices: m.devs, DevicePluginAnnotation: devicepluginAnnotation})
case usableDeviceMap := <-m.usableChan:
data, err := json.Marshal(*usableDeviceMap)
if err != nil {
log.Println("ListAndWatch:: Marshal fail")
}
devicepluginAnnotation := make(map[string]string)
devicepluginAnnotation["node.dm.alpha.kubernetes.io/UsableDeviceMap"] = string(data)
s.Send(&pluginapi.ListAndWatchResponse{Devices: m.devs, DevicePluginAnnotation: devicepluginAnnotation})
}
}
}
func (m *NvidiaDevicePlugin) unhealthy(dev *pluginapi.Device) {
m.health <- dev
m.usableDeviceMap[dev.ID] = false
m.usableChan <- &m.usableDeviceMap
}
func (m *NvidiaDevicePlugin) registerTopology() {
m.topoChan <- &m.topology.connectGraph
for _, dev := range m.devs {
if dev.Health == pluginapi.Healthy {
m.usableDeviceMap[dev.ID] = true
} else {
m.usableDeviceMap[dev.ID] = false
}
}
m.usableChan <- &m.usableDeviceMap
}
// Allocate which return list of devices.
func (m *NvidiaDevicePlugin) Allocate(ctx context.Context, reqs *pluginapi.AllocateRequest) (*pluginapi.AllocateResponse, error) {
devs := m.devs
responses := pluginapi.AllocateResponse{}
for _, req := range reqs.ContainerRequests {
response := pluginapi.ContainerAllocateResponse{
Envs: map[string]string{
"NVIDIA_VISIBLE_DEVICES": strings.Join(req.DevicesIDs, ","),
},
}
for _, id := range req.DevicesIDs {
if !deviceExists(devs, id) {
return nil, fmt.Errorf("invalid allocation request: unknown device: %s", id)
}
}
responses.ContainerResponses = append(responses.ContainerResponses, &response)
}
return &responses, nil
}
func (m *NvidiaDevicePlugin) PreStartContainer(context.Context, *pluginapi.PreStartContainerRequest) (*pluginapi.PreStartContainerResponse, error) {
return &pluginapi.PreStartContainerResponse{}, nil
}
func (m *NvidiaDevicePlugin) PreAllocate(ctx context.Context, request *pluginapi.PreAllocateRequest) (*pluginapi.PreAllocateResponse, error) {
resp, err := m.scheduleTestStub(request)
if err != nil {
log.Println("PreAllocate:: scheduler error")
}
go func(usableDevicesIDs []string, decideDevIDs []string) {
for _, dev := range m.devs {
m.usableDeviceMap[dev.ID] = false
}
for _, usableDev := range usableDevicesIDs {
m.usableDeviceMap[usableDev] = true
}
for _, decideDev := range decideDevIDs {
m.usableDeviceMap[decideDev] = false
}
m.usableChan <- &m.usableDeviceMap
}(request.UsableDevicesIDs, resp.SelectedDevicesIDs)
return resp, err
}
func (m *NvidiaDevicePlugin) cleanup() error {
if err := os.Remove(m.socket); err != nil && !os.IsNotExist(err) {
return err
}
return nil
}
func (m *NvidiaDevicePlugin) healthcheck() {
/*disableHealthChecks := strings.ToLower(os.Getenv(envDisableHealthChecks))
if disableHealthChecks == "all" {
disableHealthChecks = allHealthChecks
}
ctx, cancel := context.WithCancel(context.Background())
var xids chan *pluginapi.Device
if !strings.Contains(disableHealthChecks, "xids") {
xids = make(chan *pluginapi.Device)
go watchXIDs(ctx, m.devs, xids)
}
for {
select {
case <-m.stop:
cancel()
return
case dev := <-xids:
m.unhealthy(dev)
}
}*/
}
// Serve starts the gRPC server and register the device plugin to Kubelet
func (m *NvidiaDevicePlugin) Serve() error {
err := m.Start()
if err != nil {
log.Printf("Could not start device plugin: %s", err)
return err
}
log.Println("Starting to serve on", m.socket)
err = m.Register(pluginapi.KubeletSocket, resourceName)
if err != nil {
log.Printf("Could not register device plugin: %s", err)
m.Stop()
return err
}
log.Println("Registered device plugin with Kubelet")
return nil
}
func (m *NvidiaDevicePlugin) scheduleByTopoEdge(request *pluginapi.PreAllocateRequest) (*pluginapi.PreAllocateResponse, error) {
var selectedDevicesIDs []string
// For each edge test weather the devices it connect are usable
var usableTopoInfo TopoInfo
for _, edge := range m.topology.edges {
leftPointExist := false
rightPointExist := false
for _, usableDevID := range request.UsableDevicesIDs {
if usableDevID == edge.Dev1UUID {
leftPointExist = true
}
if usableDevID == edge.Dev2UUID {
rightPointExist = true
}
}
if leftPointExist && rightPointExist {
usableTopoInfo.edges = append(usableTopoInfo.edges, edge)
}
}
// Sort edges
usableTopoInfo.TopoEdgeSort()
// Select devices
for _, edge := range usableTopoInfo.edges {
leftExisted := false
rightExisted := false
for _, id := range selectedDevicesIDs {
if id == edge.Dev1UUID {
leftExisted = true
}
if id == edge.Dev2UUID {
rightExisted = true
}
}
if len(selectedDevicesIDs) >= int(request.DevicesNum) {
break
}
if !leftExisted {
selectedDevicesIDs = append(selectedDevicesIDs, edge.Dev1UUID)
}
if len(selectedDevicesIDs) >= int(request.DevicesNum) {
break
}
if !rightExisted {
selectedDevicesIDs = append(selectedDevicesIDs, edge.Dev2UUID)
}
}
return &pluginapi.PreAllocateResponse{
SelectedDevicesIDs: selectedDevicesIDs,
}, nil
}
func (m *NvidiaDevicePlugin) scheduleByGraphSearching(request *pluginapi.PreAllocateRequest) (*pluginapi.PreAllocateResponse, error) {
var selectedDevicesIDs []string
// Perpare a dictionary to accelerate searching weather a ID exists.
usableIDSet := make(map[string]Empty)
for _, usableID := range request.UsableDevicesIDs {
usableIDSet[usableID] = Empty{}
}
// Select out the usable devices.
usableDevices := make(ConnectedNodeList, request.DevicesNum)
i := 0
for k, v := range m.topology.connectGraph {
if _, ok := usableIDSet[k]; ok {
if i < int(request.DevicesNum) {
usableDevices[i] = ConnectedNodePacked{k, v.Score}
i++
} else {
break
}
}
}
// Sort devices from high to low
sort.Sort(usableDevices)
// Select
for j := 0; j < int(request.DevicesNum); j++ {
selectedDevicesIDs = append(selectedDevicesIDs, usableDevices[j].UUID)
}
return &pluginapi.PreAllocateResponse{
SelectedDevicesIDs: selectedDevicesIDs,
}, nil
}
func (m *NvidiaDevicePlugin) scheduleTestStub(request *pluginapi.PreAllocateRequest) (*pluginapi.PreAllocateResponse, error) {
var selectedDevicesIDs []string
// Select
for j := 0; j < int(request.DevicesNum); j++ {
selectedDevicesIDs = append(selectedDevicesIDs, request.UsableDevicesIDs[j])
}
return &pluginapi.PreAllocateResponse{
SelectedDevicesIDs: selectedDevicesIDs,
}, nil
}