use cache reduce malloc

model/query_piece_pool.go

@@ -0,0 +1,39 @@
+package model
+
+import (
+	"sync"
+)
+
+type mysqlQueryPiecePool struct {
+	queue  chan *PooledMysqlQueryPiece
+	lock sync.Mutex
+}
+
+func NewMysqlQueryPiecePool() (mqpp *mysqlQueryPiecePool) {
+	return &mysqlQueryPiecePool{
+		queue: make(chan *PooledMysqlQueryPiece, 1024),
+	}
+}
+
+func (mqpp *mysqlQueryPiecePool) Enqueue(pmqp *PooledMysqlQueryPiece)  {
+	mqpp.lock.Lock()
+	defer mqpp.lock.Unlock()
+
+
+	mqpp.queue <- pmqp
+}
+
+func (mqpp *mysqlQueryPiecePool) Dequeue() (pmqp *PooledMysqlQueryPiece)  {
+	mqpp.lock.Lock()
+	defer mqpp.lock.Unlock()
+
+	select {
+	case pmqp = <- mqpp.queue:
+		return
+	default:
+		pmqp = &PooledMysqlQueryPiece{
+			MysqlQueryPiece: MysqlQueryPiece{},
+		}
+		return
+	}
+}