fix(gateway): sustain qualified media traversal

gateway/qualification_process_test.go

@@ -19,6 +19,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"sync"
 	"testing"
@@ -71,7 +72,7 @@ type qualificationProcessRecordResult struct {
 	CPUSeconds       float64
 	PeakHeapBytes    uint64
 	PeakGoroutines   int
-	Mallocs          uint64
+	AllocatedObjects uint64
 	AllocatedBytes   uint64
 	RecordingElapsed time.Duration
 }
@@ -162,11 +163,19 @@ func (r *qualificationProcessRecorder) observe(observation mediaTimingObservatio
 
 func (r *qualificationProcessRecorder) writeTimings() {
 	defer close(r.timingDone)
+	line := make([]byte, 0, 96)
 	for sample := range r.timingSamples {
 		if r.recordErr == nil {
-			_, r.recordErr = fmt.Fprintf(r.rawBuffered, "%d,%d,%d,%d\n",
-				sample.elapsed.Nanoseconds(), sample.observation.QueueDelay.Nanoseconds(),
-				sample.observation.ProcessingDelay.Nanoseconds(), sample.observation.PacingDelay.Nanoseconds())
+			line = line[:0]
+			line = strconv.AppendInt(line, sample.elapsed.Nanoseconds(), 10)
+			line = append(line, ',')
+			line = strconv.AppendInt(line, sample.observation.QueueDelay.Nanoseconds(), 10)
+			line = append(line, ',')
+			line = strconv.AppendInt(line, sample.observation.ProcessingDelay.Nanoseconds(), 10)
+			line = append(line, ',')
+			line = strconv.AppendInt(line, sample.observation.PacingDelay.Nanoseconds(), 10)
+			line = append(line, '\n')
+			_, r.recordErr = r.rawBuffered.Write(line)
 		}
 		r.samples++
 	}
@@ -233,8 +242,8 @@ func (r *qualificationProcessRecorder) stop() (qualificationProcessRecordResult,
 	}
 	first, last := resources[0], resources[len(resources)-1]
 	result.CPUSeconds = max(last.CPUSeconds-first.CPUSeconds, 0)
-	result.Mallocs = last.Mallocs - first.Mallocs
-	result.AllocatedBytes = last.Allocated - first.Allocated
+	result.AllocatedObjects = last.AllocatedObjects - first.AllocatedObjects
+	result.AllocatedBytes = last.AllocatedBytes - first.AllocatedBytes
 	for _, sample := range resources {
 		result.PeakHeapBytes = max(result.PeakHeapBytes, sample.HeapBytes)
 		result.PeakGoroutines = max(result.PeakGoroutines, sample.Goroutines)