Golang程序内存占用过高如何优化 你好。

我正在尝试构建一个小型的HTTP API，用于接收文件并对其进行一些操作。我能够成功接收文件的base64编码，解码并将其保存到磁盘，但出于某些原因，我的程序在之后没有释放内存。

以下是服务器的完整代码：

package main

import (
	"encoding/json"
	"github.com/gorilla/mux"
	"log"
	"net/http"
	"encoding/base64"
	"os"
	"io/ioutil"
	"path"
	"os/exec"
	"fmt"
)

const progName =  "dummy"

type Request struct {
	FileBase64 string `json:"base64,omitempty"`
	FileName string `json:"filename,omitempty"`
	Auth    string `json:"auth,omitempty"`
}

type Reply struct {
	Success bool
	Status  string
}

func main() {
	router := mux.NewRouter()
	router.HandleFunc("/put", processFile).Methods("POST")
	log.Fatal(http.ListenAndServe("localhost:8000", router))
}

func processFile(w http.ResponseWriter, r *http.Request) {
	var cmd Request
	_ = json.NewDecoder(r.Body).Decode(&cmd)
	log.Printf("request received")

	// decode incoming data
	dec, err := base64.StdEncoding.DecodeString(cmd.FileBase64)
	if err != nil {
		log.Println(r.RemoteAddr, "-", "cannot decode base64:", err)
		reply := Reply{false, "cannot decode base64"}
		json.NewEncoder(w).Encode(reply)
		return
	}
	log.Printf("request decoded")

	// create temp directory
	// we need it to dump the input file and run AppImage on it.
	tempDir, err := ioutil.TempDir("", progName+"-")
	if err != nil {
		log.Println(r.RemoteAddr, "-", "cannot create temp directory:", err)
		reply := Reply{false, "cannot create temp directory"}
		json.NewEncoder(w).Encode(reply)
		return
	}
	defer os.RemoveAll(tempDir)
	log.Printf("created temp dir")

	// create output file
	zipFile, err := os.Create(path.Join(tempDir, cmd.FileName))
	if err != nil {
		log.Println(r.RemoteAddr, "-", "cannot create output file:", err)
		reply := Reply{false, "cannot create output file"}
		json.NewEncoder(w).Encode(reply)
		return
	}
	defer zipFile.Close()
	log.Printf("output file created")

	// write content
	written, err := zipFile.Write(dec)
	if err != nil {
		log.Println(r.RemoteAddr, "-", "cannot write output file:", err)
		reply := Reply{false, "cannot write output file"}
		json.NewEncoder(w).Encode(reply)
		return
	}
	log.Printf("content written")

	// flush buffer
	err = zipFile.Sync()
	if err != nil {
		log.Println(r.RemoteAddr, "-", "error while flushing buffer:", err)
		reply := Reply{false, "error while flushing buffer"}
		json.NewEncoder(w).Encode(reply)
		return
	}
	log.Printf("buffer flushed")

	reply := Reply{true, fmt.Sprintf("written %d bytes", written)}
	json.NewEncoder(w).Encode(reply)
}

为了向API发送文件，我使用以下命令：

(echo -n '{"filename": "test.zip", "base64": "'; base64 500M.bin; echo '"}') | curl -H "Content-Type: application/json" -d @-  http://127.0.0.1:8000/put

当使用500MB文件进行测试时，服务器组件会占用大量内存，更重要的是，当函数processFile退出时，它不会释放这些内存。

对于我做错了什么，有什么想法吗？

非常感谢。