Mongodb 定时释放内存

对于主要是写入的数据库，mongodb内存占满之后写入效率会变得不稳定

这个时候，你需要释放内存（可试用db.runCommand({closeAllDatabases:1}) ）实现

下面的c#代码可以用来定时释放内存，使用的时候注意把路径换成你服务器的路径，另外就是修改下释放频率

Technorati 标签: mongodb

class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                new Thread(delegate()
                {
                    Console.WriteLine("开始释放");
                    Cmd(@"echo 正在启动MongoDB
d:
cd D:\mongodb\bin
mongo
use admin
db.runCommand({closeAllDatabases:1})
", "bye");
                    Console.WriteLine("释放完成");
                }).Start();

                // 三小时
                Thread.Sleep(3 * 3600 * 1000);
            }
        }

        /// 
        /// 执行命令
        /// 
        /// 
        /// 
        static void Cmd(string cmd, string end)
        {
            Process process = new Process
            {
                StartInfo =
                {
                    FileName = "cmd.exe",
                    UseShellExecute = false,
                    RedirectStandardInput = true,
                    RedirectStandardOutput = true,
                    RedirectStandardError = true,
                    CreateNoWindow = true
                }
            };
            process.Start();
            process.StandardInput.AutoFlush = true;
            process.StandardInput.WriteLine(cmd);
            process.StandardInput.WriteLine("exit");
            var outPut = "";

            while (!(outPut = process.StandardOutput.ReadLine()).Contains(end))
            {
                Console.WriteLine(outPut);
            }

            Console.WriteLine(outPut);

            if (process.HasExited == false)
                //Process is still running.
                //Test to see if the process is hung up.
                if (process.Responding)
                    //Process was responding; close the main window.
                    process.CloseMainWindow();
                else
                    //Process was not responding; force the process to close.
                    process.Kill();

            process.Close();
        }
    }