Question

我使用流畅的nHibernate作为ORM并使用自动映射在fluenthibernate中映射类。这些类只会被映射一次，因为我在global.asax中调用它们。由于某种原因，CPU正在加扰有时高达90％。我使用ANTS性能分析器对应用程序进行了分析，发现Configure（）属性消耗了5％的cpu和buildsessionfactory（），调用后自动化器消耗了20％的CPU。我调试了应用程序和找不到问题所在。可能是什么问题？

这是我的代码

public static ISessionFactory GetSessionFactory（）

{
    lock (factorylock)
    {
        if (_sessionFactory == null)
        {

  string scriptLocation = HttpContext.Current.IsDebuggingEnabled
    ? HostingEnvironment.MapPath( ConfigurationManager.AppSettings["GetDataBaseScript"] )
    : null;

  FluentConfiguration config = Fluently
      //// Start the configuration
    .Configure() **--- This is the place where 5% of memory is being used**
      // Setup the database configuration
    .Database(
      // Configure for MS SQL Server connection
      MsSqlConfiguration
      // use MS SQL Server 2010
        .MsSql2008
      // Specify the connection string
        .ConnectionString(c => c.FromConnectionStringWithKey("DatabaseConnection"))
    )



    // Set up the mappings
    .Mappings( maps =>
      maps
        Setup mappings
        .AutoMappings
        // Load mappings from assembly
        .Add( AutoMap
          // Load auto maps configuration from assembly
          .AssemblyOf<AutoMapConfiguration>(new AutoMapConfiguration() )
          // Specify some custom conventions for Auto Map
          .Conventions.AddFromAssemblyOf<AutoMapConfiguration>()

          // Override some automapping configuration
          .UseOverridesFromAssemblyOf<AutoMapConfiguration>()
        )

    );


  // determine if we need to generate the DB or just build the configuration
  if( !String.IsNullOrEmpty( scriptLocation ) ) {
    // Where to generate the script file
    // Expose the configuration
    config.ExposeConfiguration( c => {
      // Export the schema
      new SchemaExport( c )
        // Specify where the script is to be exported
        .SetOutputFile( scriptLocation )
        .Create( true, false );
    } );
  } else {
    // Build the configuration
    config.BuildConfiguration();
  }

  // Return the NHibernate Session Factory
   _sessionFactory = config.BuildSessionFactory(); **--- This is the place where 20% is being used**
        }
        return _sessionFactory;
    }


}

Answer 1

构建SessionFactory是一项重量级操作，应该只在应用程序启动时发生一次。如果要优化它，可能的解决方案是序列化/反序列化它。

实施例： http://nhibernate.info/blogs/nhibernate/archive/2009/03/13/an-improvement-on-sessionfactory-initialization.html

使用Fluen-nHibernate会激活CPU

1 个答案: