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|
package daemon
import (
"os"
"os/exec"
"strconv"
"strings"
"github.com/containerd/containerd/contrib/nvidia"
"github.com/docker/docker/pkg/capabilities"
specs "github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
)
// TODO: nvidia should not be hard-coded, and should be a device plugin instead on the daemon object.
// TODO: add list of device capabilities in daemon/node info
var errConflictCountDeviceIDs = errors.New("cannot set both Count and DeviceIDs on device request")
const nvidiaHook = "nvidia-container-runtime-hook"
// These are NVIDIA-specific capabilities stolen from github.com/containerd/containerd/contrib/nvidia.allCaps
var allNvidiaCaps = map[nvidia.Capability]struct{}{
nvidia.Compute: {},
nvidia.Compat32: {},
nvidia.Graphics: {},
nvidia.Utility: {},
nvidia.Video: {},
nvidia.Display: {},
}
func init() {
if _, err := exec.LookPath(nvidiaHook); err != nil {
// do not register Nvidia driver if helper binary is not present.
return
}
capset := capabilities.Set{"gpu": struct{}{}, "nvidia": struct{}{}}
nvidiaDriver := &deviceDriver{
capset: capset,
updateSpec: setNvidiaGPUs,
}
for c := range allNvidiaCaps {
nvidiaDriver.capset[string(c)] = struct{}{}
}
registerDeviceDriver("nvidia", nvidiaDriver)
}
func setNvidiaGPUs(s *specs.Spec, dev *deviceInstance) error {
req := dev.req
if req.Count != 0 && len(req.DeviceIDs) > 0 {
return errConflictCountDeviceIDs
}
if len(req.DeviceIDs) > 0 {
s.Process.Env = append(s.Process.Env, "NVIDIA_VISIBLE_DEVICES="+strings.Join(req.DeviceIDs, ","))
} else if req.Count > 0 {
s.Process.Env = append(s.Process.Env, "NVIDIA_VISIBLE_DEVICES="+countToDevices(req.Count))
} else if req.Count < 0 {
s.Process.Env = append(s.Process.Env, "NVIDIA_VISIBLE_DEVICES=all")
}
var nvidiaCaps []string
// req.Capabilities contains device capabilities, some but not all are NVIDIA driver capabilities.
for _, c := range dev.selectedCaps {
nvcap := nvidia.Capability(c)
if _, isNvidiaCap := allNvidiaCaps[nvcap]; isNvidiaCap {
nvidiaCaps = append(nvidiaCaps, c)
continue
}
// TODO: nvidia.WithRequiredCUDAVersion
// for now we let the prestart hook verify cuda versions but errors are not pretty.
}
if nvidiaCaps != nil {
s.Process.Env = append(s.Process.Env, "NVIDIA_DRIVER_CAPABILITIES="+strings.Join(nvidiaCaps, ","))
}
path, err := exec.LookPath(nvidiaHook)
if err != nil {
return err
}
if s.Hooks == nil {
s.Hooks = &specs.Hooks{}
}
s.Hooks.Prestart = append(s.Hooks.Prestart, specs.Hook{
Path: path,
Args: []string{
nvidiaHook,
"prestart",
},
Env: os.Environ(),
})
return nil
}
// countToDevices returns the list 0, 1, ... count-1 of deviceIDs.
func countToDevices(count int) string {
devices := make([]string, count)
for i := range devices {
devices[i] = strconv.Itoa(i)
}
return strings.Join(devices, ",")
}
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