Optimize network transport for large data

common/net/transport.go

@@ -4,6 +4,11 @@ import (
 	"io"
 )
 
+const (
+	minBufferSizeKilo = 2
+	maxBufferSizeKilo = 128
+)
+
 func ReadFrom(reader io.Reader, sizeInKilo int) ([]byte, error) {
 	buffer := make([]byte, sizeInKilo<<10)
 	nBytes, err := reader.Read(buffer)
@@ -13,9 +18,23 @@ func ReadFrom(reader io.Reader, sizeInKilo int) ([]byte, error) {
 	return buffer[:nBytes], err
 }
 
+func roundUp(size int) int {
+	if size <= minBufferSizeKilo {
+		return minBufferSizeKilo
+	}
+	if size >= maxBufferSizeKilo {
+		return maxBufferSizeKilo
+	}
+	size--
+	size |= size >> 1
+	size |= size >> 2
+	size |= size >> 4
+	return size + 1
+}
+
 // ReaderToChan dumps all content from a given reader to a chan by constantly reading it until EOF.
 func ReaderToChan(stream chan<- []byte, reader io.Reader) error {
-	bufferSizeKilo := 4
+	bufferSizeKilo := 2
 	for {
 		data, err := ReadFrom(reader, bufferSizeKilo)
 		if len(data) > 0 {
@@ -24,6 +43,15 @@ func ReaderToChan(stream chan<- []byte, reader io.Reader) error {
 		if err != nil {
 			return err
 		}
+		if bufferSizeKilo == maxBufferSizeKilo {
+			continue
+		}
+		dataLenKilo := len(data) >> 10
+		if dataLenKilo == bufferSizeKilo {
+			bufferSizeKilo <<= 1
+		} else {
+			bufferSizeKilo = roundUp(dataLenKilo)
+		}
 	}
 }
 

common/net/transport_test.go

@@ -44,6 +44,9 @@ func (reader *StaticReader) Read(b []byte) (size int, err error) {
 	if size > reader.total-reader.current {
 		size = reader.total - reader.current
 	}
+	for i := 0; i < len(b); i++ {
+		b[i] = byte(i)
+	}
 	//rand.Read(b[:size])
 	reader.current += size
 	if reader.current == reader.total {
@@ -110,8 +113,8 @@ func BenchmarkTransport10M(b *testing.B) {
 
 func runBenchmarkTransport(size int) {
 
-	transportChanA := make(chan []byte, 128)
+	transportChanA := make(chan []byte, 16)
-	transportChanB := make(chan []byte, 128)
+	transportChanB := make(chan []byte, 16)
 
 	readerA := &StaticReader{size, 0}
 	readerB := &StaticReader{size, 0}