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nvidia.go
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nvidia.go
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package main
import (
"context"
"fmt"
"log"
"os"
"os/signal"
"syscall"
"time"
"github.com/NVIDIA/gpu-monitoring-tools/bindings/go/nvml"
"github.com/kelseyhightower/envconfig"
"golang.org/x/sync/errgroup"
)
// NvidiaConfig is the defined config by envconfig.
type NvidiaConfig struct {
// SendIntervalSecond indicates the number of seconds between sending metrics to CloudWatch.
SendIntervalSecond time.Duration `default:"60s" split_words:"true"`
// CollectIntervalSecond indicates the number of seconds between collecting GPU metrics.
// Send the average value which is collected every SendIntervalSecond to CloudWatch.
CollectIntervalSecond time.Duration `default:"5s" split_words:"true"`
}
var nvidiaConfig NvidiaConfig
func init() {
if err := envconfig.Process("", &nvidiaConfig); err != nil {
log.Fatal(err)
}
}
func (client *Client) gpuUtilizationTicker(ctx context.Context, devices []*nvml.Device) error {
sendTicker := time.NewTicker(nvidiaConfig.SendIntervalSecond)
collectTicker := time.NewTicker(nvidiaConfig.CollectIntervalSecond)
defer sendTicker.Stop()
defer collectTicker.Stop()
metric := float64(0)
count := 0
for {
select {
case <-sendTicker.C:
sentMetric := metric / float64(count)
if err := client.ReportGpuMetrics("gpu_usage", float64(sentMetric)); err != nil {
return err
}
metric = 0
count = 0
case <-collectTicker.C:
for i, device := range devices {
st, err := device.Status()
if err != nil {
return fmt.Errorf("error getting device %d status: %v", i, err)
}
metric += float64(*st.Utilization.GPU)
count++
}
case <-ctx.Done():
log.Println("Stop GPU utilization")
return ctx.Err()
}
}
}
func (client *Client) gpuMemoryUtilizationTicker(ctx context.Context, devices []*nvml.Device) error {
sendTicker := time.NewTicker(nvidiaConfig.SendIntervalSecond)
collectTicker := time.NewTicker(nvidiaConfig.CollectIntervalSecond)
defer sendTicker.Stop()
defer collectTicker.Stop()
metric := float64(0)
count := 0
for {
select {
case <-sendTicker.C:
sentMetric := metric / float64(count)
if err := client.ReportGpuMetrics("memory_usage", float64(sentMetric)); err != nil {
return err
}
metric = 0
count = 0
case <-collectTicker.C:
for i, device := range devices {
st, err := device.Status()
if err != nil {
return fmt.Errorf("error getting device %d status: %v", i, err)
}
metric += float64(*st.Utilization.Memory)
count++
}
case <-ctx.Done():
log.Println("Stop GPU memory utilization ticker")
return ctx.Err()
}
}
}
func (client *Client) gpuTemperatureTicker(ctx context.Context, devices []*nvml.Device) error {
sendTicker := time.NewTicker(nvidiaConfig.SendIntervalSecond)
collectTicker := time.NewTicker(nvidiaConfig.CollectIntervalSecond)
defer sendTicker.Stop()
defer collectTicker.Stop()
metric := float64(0)
count := 0
for {
select {
case <-sendTicker.C:
sentMetric := metric / float64(count)
if err := client.ReportGpuMetrics("temperature", float64(sentMetric)); err != nil {
return err
}
case <-collectTicker.C:
for i, device := range devices {
st, err := device.Status()
if err != nil {
return fmt.Errorf("error getting device %d status: %v", i, err)
}
metric += float64(*st.Temperature)
count++
}
case <-ctx.Done():
log.Println("Stop GPU temperature ticker")
return ctx.Err()
}
}
}
func signalContext(ctx context.Context) context.Context {
parent, cancelParent := context.WithCancel(ctx)
go func() {
defer cancelParent()
sig := make(chan os.Signal, 1)
signal.Notify(sig,
syscall.SIGHUP,
syscall.SIGINT,
syscall.SIGTERM,
syscall.SIGQUIT)
defer signal.Stop(sig)
select {
case <-parent.Done():
log.Println("Cancel from parent")
return
case <-sig:
log.Println("Cancel from signal")
return
}
}()
return parent
}
// Run runs collect and send gpu metrics.
func (client *Client) Run(ctx context.Context) error {
if err := nvml.Init(); err != nil {
return err
}
defer nvml.Shutdown()
count, err := nvml.GetDeviceCount()
if err != nil {
return fmt.Errorf("error getting device count: %v", err)
}
var devices []*nvml.Device
for i := uint(0); i < count; i++ {
device, err := nvml.NewDevice(i)
if err != nil {
return fmt.Errorf("error getting device %d: %v", i, err)
}
devices = append(devices, device)
}
parent := signalContext(ctx)
eg, child := errgroup.WithContext(parent)
eg.Go(func() error {
return client.gpuUtilizationTicker(child, devices)
})
eg.Go(func() error {
return client.gpuMemoryUtilizationTicker(child, devices)
})
eg.Go(func() error {
return client.gpuTemperatureTicker(child, devices)
})
return eg.Wait()
}