.NET memcached client library性能优化（一）

来源：互联网发布：初高中数学衔接知教案编辑：程序博客网时间：2024/05/17 00:04

最近手上的一个项目使用了MemCached作为缓存，使用老外的 .NET memcached client library作为客服端。（下载文件：https://sourceforge.net/projects/memcacheddotnet/）。使用后发现，socket池没有对socket进行定时回收，从而导致性能上的缺失。具体代码见“SockIOPool.cs”。

添加代码如下：

        //the recycle age of socket ,default to failover in event of cache server dead
        private TimeSpan socketRecycleAge = TimeSpan.FromMinutes(30);
        internal TimeSpan SocketRecycleAge { get { return socketRecycleAge; } set { socketRecycleAge = value; } }

......

        [MethodImpl(MethodImplOptions.Synchronized)]
        protected void SelfMaintain()
        {

......

                //clear older than the recycle age socket
                foreach (SockIO socket in new IteratorIsolateCollection(sockets.Keys))
                {
                    // the socket is older than the recycle age, we destroy it
                    // and remove from pool
                    if (DateTime.Now - socket.Created > socketRecycleAge)
                    {
                        if (Log.IsDebugEnabled)
                        {
                            Log.Debug(GetLocalizedString("removing older than the recycle age entry"));
                        }
                        try
                        {
                            socket.TrueClose();
                        }
                        catch (IOException ioe)
                        {
                            if (Log.IsErrorEnabled)
                            {
                                Log.Error(GetLocalizedString("failed to close socket"), ioe);
                            }
                        }
                        //remove
                        sockets.Remove(socket);
                    }
                }

......

}

在使用中需要打开内部socket状态维持线程

private long _maintThreadSleep = 1000 * 5; // maintenance thread sleep time (in milliseconds)

即设置_maintThreadSleep > 0。