Override 3 sec. WMI timeout in gopsutil

The default timeout is too short for some overburdened or resource
constrained machines to complete the WMI query before the context
deadline expires.  This causes them to be unable to fingerprint the CPU
properly.

helper/stats/cpu.go

@@ -1,14 +1,21 @@
 package stats
 
 import (
+	"context"
 	"fmt"
 	"math"
 	"sync"
+	"time"
 
 	multierror "github.com/hashicorp/go-multierror"
 	"github.com/shirou/gopsutil/cpu"
 )
 
+const (
+	// We use this constant to override the built in 3 second timeout in gopsutil
+	cpuInfoTimeout = 10 * time.Second
+)
+
 var (
 	cpuMhzPerCore float64
 	cpuModelName  string
@@ -28,7 +35,9 @@ func Init() error {
 		}
 
 		var cpuInfo []cpu.InfoStat
-		if cpuInfo, err = cpu.Info(); err != nil {
+		ctx, _ := context.WithTimeout(context.Background(), cpuInfoTimeout)
+
+		if cpuInfo, err = cpu.InfoWithContext(ctx); err != nil {
 			merrs = multierror.Append(merrs, fmt.Errorf("Unable to obtain CPU information: %v", initErr))
 		}