近期有个性能调优工作。通过dottrace 分析,发现几处问题,其中json.net 在序列化和反序列化的时候也比较耗性能,所以考虑能不能通过其它序列化方式来提高性能。
1 object 序列化代码
- public class ObjectConvert
- {
- /// <summary>
- /// 将一个object对象序列化,返回一个byte[]
- /// </summary>
- /// <param name="obj">能序列化的对象</param>
- /// <returns></returns>
- public static byte[] ObjectToBytes(object obj)
- {
- using (MemoryStream ms = new MemoryStream())
- {
- IFormatter formatter = new BinaryFormatter();
- formatter.Serialize(ms,obj); return ms.GetBuffer();
- }
- }
- /// <summary>
- /// 将一个序列化后的byte[]数组还原
- /// </summary>
- /// <param name="Bytes"></param>
- /// <returns></returns>
- public static object BytesToObject(byte[] Bytes)
- {
- using (MemoryStream ms = new MemoryStream(Bytes))
- {
- IFormatter formatter = new BinaryFormatter();
- return formatter.Deserialize(ms);
- }
- }
- }
2 Test 方法,用了 老赵写的codetimer
- [TestClass]
- public class SerializeTestor
- {
- private List<UserInfo> InitData(int count)
- {
- UserInfo user = null;
- List<UserInfo> users = new List<UserInfo>();
- for (int i = 0; i < count; i++)
- {
- user = new UserInfo();
- user.Age = new Random().Next(10,100);
- user.Name = "yuan";
- user.CreateTime = DateTime.Now;
- users.Add(user);
- }
- return users;
- }
- private List<UserInfo> InitBigStringData(int count)
- {
- UserInfo user = null;
- List<UserInfo> users = new List<UserInfo>();
- for (int i = 0; i < count; i++)
- {
- user = new UserInfo();
- user.Age = new Random().Next(10,100);
- //user.Name = "yuan";
- user.Name = "yudddddddddddddddddddddddddddyudddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddanyudddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddanyudddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddanyudddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddanddddddddddddddddddddddddddddddddddddddddddddddddddan";
- user.CreateTime = DateTime.Now;
- users.Add(user);
- }
- return users;
- }
- [TestMethod]
- public void Serialize_十万次_Test()
- {
- var users = InitData(100000);
- // object序列化
- CodeTimer.Time("object序列化",1,() =>
- {
- var temps = ObjectConvert.ObjectToBytes(users);
- });
- // newtonsoft.json
- CodeTimer.Time("json.net序列化",() =>
- {
- var temps = JsonConvert.SerializeObject(users);
- });
- }
- [TestMethod]
- public void Serialize_百万次_Test()
- {
- var users = InitData(1000000);
- // object序列化
- CodeTimer.Time("object序列化",() =>
- {
- var temps = JsonConvert.SerializeObject(users);
- });
- }
- [TestMethod]
- public void SerializeBigString_十万次_Test()
- {
- var users = InitBigStringData(100000);
- // object序列化
- CodeTimer.Time("object序列化",() =>
- {
- var temps = JsonConvert.SerializeObject(users);
- });
- }
- [TestMethod]
- public void SerializeBigString_百万次_Test()
- {
- var users = InitBigStringData(1000000);
- // object序列化
- CodeTimer.Time("object序列化",() =>
- {
- var temps = JsonConvert.SerializeObject(users);
- });
- }
- }
3 测试结果:
- Serialize_十万次_Test:
- object序列化
- Time Elapsed: 188ms
- Time Elapsed (one time):188ms
- cpu time: 187,500,000ns
- cpu time (one time): 187,000ns
- Gen 0: 1
- Gen 1: 0
- Gen 2: 0
- json.net序列化
- Time Elapsed: 138ms
- Time Elapsed (one time):138ms
- cpu time: 140,625,000ns
- cpu time (one time): 140,000ns
- Gen 0: 3
- Gen 1: 1
- Gen 2: 0
- ================================================
- Serialize_百万次_Test
- object序列化
- Time Elapsed: 2,073ms
- Time Elapsed (one time):2,073ms
- cpu time: 2,078,125,000ns
- cpu time (one time): 2,000ns
- Gen 0: 23
- Gen 1: 1
- Gen 2: 0
- json.net序列化
- Time Elapsed: 1,449ms
- Time Elapsed (one time):1,449ms
- cpu time: 1,437,000ns
- cpu time (one time): 1,000ns
- Gen 0: 28
- Gen 1: 27
- Gen 2: 0
- ===================================================
- SerializeBigString_十万次_Test
- object序列化
- Time Elapsed: 187ms
- Time Elapsed (one time):187ms
- cpu time: 187,000ns
- Gen 0: 3
- Gen 1: 2
- Gen 2: 2
- json.net序列化
- Time Elapsed: 339ms
- Time Elapsed (one time):339ms
- cpu time: 328,000ns
- cpu time (one time): 328,000ns
- Gen 0: 19
- Gen 1: 14
- Gen 2: 3
- ======================================================
- SerializeBigString_百万次_Test
- object序列化
- Time Elapsed: 2,099ms
- Time Elapsed (one time):2,099ms
- cpu time: 2,046,875,000ns
- Gen 0: 26
- Gen 1: 25
- Gen 2: 3
- json.net序列化
- System.OutOfMemoryException: 引发类型为“System.OutOfMemoryException”的异常。
4 结论:
JSON.NET 在小对象处理时,性能比BinaryFormatter好
JSON.NET 比BinaryFormatter 耗内存
JSON.NET GC中带回收的对象会比较影响整体性能