opt: optimization of machine performance data reading (#5174)

Co-authored-by: sam.yang <sam.yang@yijinin.com>

core/prof/runtime.go

@@ -5,6 +5,8 @@ import (
 	"io"
 	"os"
 	"runtime"
+	"runtime/debug"
+	"runtime/metrics"
 	"time"
 )
 
@@ -28,10 +30,29 @@ func displayStatsWithWriter(writer io.Writer, interval ...time.Duration) {
 		ticker := time.NewTicker(duration)
 		defer ticker.Stop()
 		for range ticker.C {
-			var m runtime.MemStats
-			runtime.ReadMemStats(&m)
+			var (
+				alloc, totalAlloc, sys uint64
+				samples                = []metrics.Sample{
+					{Name: "/memory/classes/heap/objects:bytes"},
+					{Name: "/gc/heap/allocs:bytes"},
+					{Name: "/memory/classes/total:bytes"},
+				}
+			)
+			metrics.Read(samples)
+
+			if samples[0].Value.Kind() == metrics.KindUint64 {
+				alloc = samples[0].Value.Uint64()
+			}
+			if samples[1].Value.Kind() == metrics.KindUint64 {
+				totalAlloc = samples[1].Value.Uint64()
+			}
+			if samples[2].Value.Kind() == metrics.KindUint64 {
+				sys = samples[2].Value.Uint64()
+			}
+			var stats debug.GCStats
+			debug.ReadGCStats(&stats)
 			fmt.Fprintf(writer, "Goroutines: %d, Alloc: %vm, TotalAlloc: %vm, Sys: %vm, NumGC: %v\n",
-				runtime.NumGoroutine(), m.Alloc/mega, m.TotalAlloc/mega, m.Sys/mega, m.NumGC)
+				runtime.NumGoroutine(), alloc/mega, totalAlloc/mega, sys/mega, stats.NumGC)
 		}
 	}()
 }