go语言服务端内存持续增长，求解惑！

最近用golang开发了一个socket服务端，主要逻辑就是接收客户端发来的数据解析后存入opentsdb中，但是跑一段时间后发现内存就会增长，而且不会被gc回收，初步判定是由于大量make []byte 导致内存不释放，代码如下，求高人解惑？ ``` func StartTCP() error { tcp_addr, _ := net.ResolveTCPAddr("tcp4", tcp_listen) listener, err := net.ListenTCP("tcp4", tcp_addr) if err != nil { return err } defer listener.Close() log.Info("start tcp listen on %s", tcp_listen) for { conn, err := listener.AcceptTCP() if err != nil { log.Error("accept error %s", err.Error()) continue } log.Info("new session create %s", conn.RemoteAddr().String()) go HandlerConn(conn) } } func ReadPacket(conn *net.TCPConn) []byte { head := make([]byte, 4) _, err := io.ReadFull(conn, head) if err != nil { return nil } size := binary.BigEndian.Uint32(head) data := make([]byte, size) _, err = io.ReadFull(conn, data) if err != nil { return nil } return data } func HandlerConn(conn *net.TCPConn) { addr := conn.RemoteAddr().String() defer func() { if err := conn.Close(); err != nil { log.Error("close session error %s", err.Error()) } else { log.Info("session closed %s", addr) } }() data := ReadPacket(conn) if len(data) == 0 { log.Warn("empty data") return } go HandlerMsg(conn, data, t) } ``` 附pprof信息 ``` (pprof) top 9.92GB of 9.93GB total ( 100%) Dropped 359 nodes (cum <= 0.05GB) flat flat% sum% cum cum% 9.92GB 100% 100% 9.92GB 100% main.ReadPacket 0 0% 100% 9.92GB 100% main.HandlerConn 0 0% 100% 9.92GB 100% runtime.goexit (pprof) list main.ReadPacket Total: 9.93GB ROUTINE ======================== main.ReadPacket in /tmp/td- server/tcp_server.go 9.92GB 9.92GB (flat, cum) 100% of Total . . 30: go HandlerConn(conn) . . 31: } . . 32:} . . 33: . . 34:func ReadPacket(conn *net.TCPConn) []byte { . . 35: head := make([]byte, 4) . . 36: _, err := io.ReadFull(conn, head) . . 37: if err != nil { . . 38: return nil . . 39: } . . 40: size := binary.BigEndian.Uint32(head) 9.92GB 9.92GB 41: data := make([]byte, size) . . 42: _, err = io.ReadFull(conn, data) . . 43: if err != nil { . . 44: return nil . . 45: } . . 46: return data . . 47:} ``` ----------------------------------------------------------------------------------- 上次重启过后运行了一周目前很稳定，pprof发现内存占用和之前完全不一样，很奇怪 最新pprof ``` (pprof) top 3201.70kB of 3201.70kB total ( 100%) Dropped 362 nodes (cum <= 16.01kB) Showing top 10 nodes out of 19 (cum >= 1536.14kB) flat flat% sum% cum cum% 1024.11kB 31.99% 31.99% 1024.11kB 31.99% main.(*Device).getIndex 641.34kB 20.03% 52.02% 641.34kB 20.03% main.init_config 512.14kB 16.00% 68.01% 512.14kB 16.00% mcommoninit 512.08kB 15.99% 84.01% 512.08kB 15.99% database/sql.(*DB).addDepLocked 512.03kB 15.99% 100% 512.03kB 15.99% bufio.(*Reader).ReadString 0 0% 100% 512.08kB 15.99% database/sql.(*DB).Query 0 0% 100% 512.08kB 15.99% database/sql.(*DB).QueryRow 0 0% 100% 512.08kB 15.99% database/sql.(*DB).conn 0 0% 100% 512.08kB 15.99% database/sql.(*DB).query 0 0% 100% 1536.14kB 47.98% main.(*Device).CollectHW (pprof) ```