Reduce heap allocs 2 (#46)

* reduce heap allocations in tcp logging; omit use of AppendFloat which allocates a metric sh*tton

* debugheaplog: better heap statistic logging

* heap: use string for pcap.Frame.Protocol

* add potential to eliminate Flags.String heap alloc, remove incorrect HEAP comments

* add StackAsync.DebugErr and httpraw.SetBytes

* many heap alloc reductions and replacement of bytes.Equal with internal.BytesEqual

internal/debug_heaplog.go

@@ -15,9 +15,6 @@ const (
 )
 
 var (
-	memstats   runtime.MemStats
-	lastAllocs uint64
-
 	timebuf [len(timefmt) * 2]byte
 )
 
@@ -28,12 +25,7 @@ func LogEnabled(l *slog.Logger, lvl slog.Level) bool {
 func LogAttrs(_ *slog.Logger, level slog.Level, msg string, attrs ...slog.Attr) {
 	now := time.Now()
 	n := len(now.AppendFormat(timebuf[:0], timefmt))
-	runtime.ReadMemStats(&memstats)
-	if memstats.TotalAlloc != lastAllocs {
-		print("[ALLOC] inc=", int64(memstats.TotalAlloc)-int64(lastAllocs))
-		print(" tot=", memstats.TotalAlloc, " seqs")
-		println()
-	}
+	LogAllocs(msg)
 	print("time=", unsafe.String(&timebuf[0], n), " ")
 	if level == LevelTrace {
 		print("TRACE ")
@@ -57,8 +49,12 @@ func LogAttrs(_ *slog.Logger, level slog.Level, msg string, attrs ...slog.Attr)
 		}
 	}
 	println()
+	allocmu.Lock()
 	runtime.ReadMemStats(&memstats)
-	if memstats.TotalAlloc != lastAllocs {
-		lastAllocs = memstats.TotalAlloc
+	if lastAllocs != memstats.TotalAlloc {
+		print("alloc increase in heaplog")
 	}
+	lastAllocs = memstats.TotalAlloc
+	lastMallocs = memstats.Mallocs
+	allocmu.Unlock()
 }