Reuse 32KB buffers in copyBufferLog with sync.Pool (#1572)

* Bolt: Reuse 32KB buffers in copyBufferLog with sync.Pool

Delete .jules directory

* Add benchmark test for copyBufferLog function

core/server/copy.go

@@ -3,13 +3,24 @@ package server
 import (
 	"errors"
 	"io"
+	"sync"
 	"time"
 )
 
 var errDisconnect = errors.New("traffic logger requested disconnect")
 
+var copyBufPool = sync.Pool{
+	New: func() any {
+		b := make([]byte, 32*1024)
+		return &b
+	},
+}
+
 func copyBufferLog(dst io.Writer, src io.Reader, log func(n uint64) bool) error {
-	buf := make([]byte, 32*1024)
+	bufp := copyBufPool.Get().(*[]byte)
+	buf := *bufp
+	defer copyBufPool.Put(bufp)
+
 	for {
 		nr, er := src.Read(buf)
 		if nr > 0 {

core/server/copy_benchmark_test.go

@@ -0,0 +1,23 @@
+package server
+
+import (
+	"bytes"
+	"io"
+	"testing"
+)
+
+func BenchmarkCopyBufferLog(b *testing.B) {
+	srcData := make([]byte, 1024*1024) // 1MB
+	for i := range srcData {
+		srcData[i] = byte(i)
+	}
+
+	b.ReportAllocs()
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		src := bytes.NewReader(srcData)
+		dst := io.Discard
+		copyBufferLog(dst, src, func(n uint64) bool { return true })
+	}
+}