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nvidia.go
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nvidia.go
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package nvidia
import (
"fmt"
"strings"
log "github.com/golang/glog"
"github.com/NVIDIA/gpu-monitoring-tools/bindings/go/nvml"
"golang.org/x/net/context"
pluginapi "k8s.io/kubernetes/pkg/kubelet/apis/deviceplugin/v1beta1"
)
var (
gpuMemory uint
metric MemoryUnit
)
func check(err error) {
if err != nil {
log.Fatalln("Fatal:", err)
}
}
func generateFakeDeviceID(realID string, fakeCounter uint) string {
return fmt.Sprintf("%s-_-%d", realID, fakeCounter)
}
func extractRealDeviceID(fakeDeviceID string) string {
return strings.Split(fakeDeviceID, "-_-")[0]
}
func setGPUMemory(raw uint) {
v := raw
if metric == GiBPrefix {
v = raw / 1024
}
gpuMemory = v
log.Infof("set gpu memory: %d", gpuMemory)
}
func getGPUMemory() uint {
return gpuMemory
}
func getDeviceCount() uint {
n, err := nvml.GetDeviceCount()
check(err)
return n
}
func getDevices() ([]*pluginapi.Device, map[string]uint) {
n, err := nvml.GetDeviceCount()
check(err)
var devs []*pluginapi.Device
realDevNames := map[string]uint{}
for i := uint(0); i < n; i++ {
d, err := nvml.NewDevice(i)
check(err)
// realDevNames = append(realDevNames, d.UUID)
var id uint
log.Infof("Deivce %s's Path is %s", d.UUID, d.Path)
_, err = fmt.Sscanf(d.Path, "/dev/nvidia%d", &id)
check(err)
realDevNames[d.UUID] = id
// var KiB uint64 = 1024
log.Infof("# device Memory: %d", uint(*d.Memory))
if getGPUMemory() == uint(0) {
setGPUMemory(uint(*d.Memory))
}
for j := uint(0); j < getGPUMemory(); j++ {
fakeID := generateFakeDeviceID(d.UUID, j)
if j == 0 {
log.Infoln("# Add first device ID: " + fakeID)
}
if j == getGPUMemory()-1 {
log.Infoln("# Add last device ID: " + fakeID)
}
devs = append(devs, &pluginapi.Device{
ID: fakeID,
Health: pluginapi.Healthy,
})
}
}
return devs, realDevNames
}
func deviceExists(devs []*pluginapi.Device, id string) bool {
for _, d := range devs {
if d.ID == id {
return true
}
}
return false
}
func watchXIDs(ctx context.Context, devs []*pluginapi.Device, xids chan<- *pluginapi.Device) {
eventSet := nvml.NewEventSet()
defer nvml.DeleteEventSet(eventSet)
for _, d := range devs {
realDeviceID := extractRealDeviceID(d.ID)
err := nvml.RegisterEventForDevice(eventSet, nvml.XidCriticalError, realDeviceID)
if err != nil && strings.HasSuffix(err.Error(), "Not Supported") {
log.Infof("Warning: %s (%s) is too old to support healthchecking: %s. Marking it unhealthy.", realDeviceID, d.ID, err)
xids <- d
continue
}
if err != nil {
log.Fatalf("Fatal error:", err)
}
}
for {
select {
case <-ctx.Done():
return
default:
}
e, err := nvml.WaitForEvent(eventSet, 5000)
if err != nil && e.Etype != nvml.XidCriticalError {
continue
}
// FIXME: formalize the full list and document it.
// http://docs.nvidia.com/deploy/xid-errors/index.html#topic_4
// Application errors: the GPU should still be healthy
if e.Edata == 31 || e.Edata == 43 || e.Edata == 45 {
continue
}
if e.UUID == nil || len(*e.UUID) == 0 {
// All devices are unhealthy
for _, d := range devs {
xids <- d
}
continue
}
for _, d := range devs {
if extractRealDeviceID(d.ID) == *e.UUID {
xids <- d
}
}
}
}