asp.net Cache vs memcached
一、环境Server:IBM X365 M3 8Core 8G RAM
OS:windows server 2008 r2 & Hyper-V+CentOS 6.2
二、代码
（1）主体代码，简单读取：
SqlDataAdapter DataAdapter = new SqlDataAdapter();
SqlConnection Conn = new SqlConnection(DataConn);
Conn.Open();
SqlCommand myCommand = new SqlCommand(sql, Conn);
DataAdapter.SelectCommand = myCommand;
DataAdapter.Fill(ds);
Conn.Close()
（2）Memcached(客户端:BeITMemcached)
cache.SendReceiveTimeout = 5000;
cache.MinPoolSize = 2;
cache.MaxPoolSize = 5;
string cached_dt = cache.Get(key) as string;
if (cached_dt == null)
{
//主体代码
string str_dt = DataTableXml.SerializeDataTableXml(ds.Tables);
cache.Set(key, str_dt, 30);
}
else
{
ds.Tables.Add(DataTableXml.DeserializeDataTable(cached_dt));
}
（3）Asp.net Cache
if (HttpContext.Current.Cache==null)
{
//主体代码
HttpContext.Current.Cache.Insert(key, ds, null, DateTime.Now.AddSeconds(30), System.Web.Caching.Cache.NoSlidingExpiration);
}
else
{
ds = (DataSet)HttpContext.Current.Cache;
}
三、测试工具与参数
ab -t 30 -c 50 192.168.0.226/t.aspx
说明：t.aspx页面读取Dataset 24次,for(int i=1;i<=24;i++)
四、结果
（1）Memcached
Requests per second: 293.53 [#/sec] (mean)
Time per request: 170.343 (mean)
（2）Asp.net Cache
Requests per second: 2408.06 [#/sec] (mean)
Time per request: 20.764 (mean)
五、结论
Memcached可能在对象序列化及网络上相对LocalCache性能损耗大很多！
作者：敖士伟 ao.shiwei@gmail.com
引用：
CacheType Cache Gets/sec
ArrayCache 365000
APC Cache 98000
FileCache 27000
MemcachedCache(TCP/IP) 12200
MySQLQueryCache(TCP/IP) 9900
MySQLQueryCache(UnixSocket) 13500
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