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// SPDX-License-Identifier: GPL-3.0-or-later
package intelgpu
import (
"bufio"
"bytes"
"errors"
"os/exec"
"strconv"
"sync"
"time"
"github.com/netdata/netdata/go/go.d.plugin/logger"
)
func newIntelGpuTopExec(ndsudoPath string, updateEvery int, log *logger.Logger) (*intelGpuTopExec, error) {
topExec := &intelGpuTopExec{
Logger: log,
ndsudoPath: ndsudoPath,
updateEvery: updateEvery,
}
if err := topExec.run(); err != nil {
return nil, err
}
return topExec, nil
}
type intelGpuTopExec struct {
*logger.Logger
ndsudoPath string
updateEvery int
cmd *exec.Cmd
done chan struct{}
mux sync.Mutex
lastSample string
}
func (e *intelGpuTopExec) run() error {
refresh := 900
if e.updateEvery > 1 {
refresh = e.updateEvery*1000 - 500 // milliseconds
}
cmd := exec.Command(e.ndsudoPath, "igt-json", "--interval", strconv.Itoa(refresh))
e.Debugf("executing '%s'", cmd)
r, err := cmd.StdoutPipe()
if err != nil {
return err
}
if err := cmd.Start(); err != nil {
return err
}
firstSample := make(chan struct{}, 1)
done := make(chan struct{})
e.cmd = cmd
e.done = done
go func() {
defer close(done)
sc := bufio.NewScanner(r)
var buf bytes.Buffer
var n int
for sc.Scan() {
if n++; n > 1000 {
break
}
text := sc.Text()
if buf.Cap() == 0 && text != "{" || text == "" {
continue
}
if text == "}," {
text = "}"
}
buf.WriteString(text + "\n")
if text[0] == '}' {
e.mux.Lock()
e.lastSample = buf.String()
e.mux.Unlock()
select {
case firstSample <- struct{}{}:
default:
}
buf.Reset()
n = 0
}
}
}()
select {
case <-e.done:
_ = e.stop()
return errors.New("process exited before the first sample was collected")
case <-time.After(time.Second * 3):
_ = e.stop()
return errors.New("timed out waiting for first sample")
case <-firstSample:
return nil
}
}
func (e *intelGpuTopExec) queryGPUSummaryJson() ([]byte, error) {
select {
case <-e.done:
return nil, errors.New("process has already exited")
default:
}
e.mux.Lock()
defer e.mux.Unlock()
return []byte(e.lastSample), nil
}
func (e *intelGpuTopExec) stop() error {
if e.cmd == nil || e.cmd.Process == nil {
return nil
}
_ = e.cmd.Process.Kill()
_, _ = e.cmd.Process.Wait()
e.cmd = nil
select {
case <-e.done:
return nil
case <-time.After(time.Second * 2):
return errors.New("timed out waiting for process to exit")
}
}
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