提高大型阵列的WCF性能

时间:2013-01-02 13:57:35

标签: performance wcf protobuf-net

我们正在使用WCF将数据从服务器应用程序传输到多个客户端。实际上,对于大多数流量,客户端和服务器都在同一台机器上运行,所以我希望传输速度非常快。

但是,在传输大型阵列(16位灰度图像)时,传输数据需要几秒钟。对于16 MB的图像,大约需要3-5秒!

最初,我们使用ushort数组,因为它是存储16位灰度图像数据的最合适的数据类型。然而,这非常缓慢:16 MB大约20-25秒。当我们在使用byte进行序列化之前将数据复制到Buffer.BlockCopy数组时,由于某种原因,它会减少到3-5秒。但是,在同一台机器上运行16 MB从一个应用程序转移到另一个应用程序的时间为3-5秒对我来说似乎太长了!

因此,我的问题是:我们如何改善此类情景的效果?

我已经调查了Marc Gravell的protobuf-net,但我不确定它是否会对这种情况有所帮助......有任何经验或其他建议吗?

以下是我们的一个数据类(包含图像数据)的源代码:

[DataContract(IsReference = true)]
public class ImageData
{
    private ushort[] m_pixelData;

    public ushort[] PixelData
    {
        get
        {
            return m_pixelData;
        }
        set
        {
            m_pixelData = value;
            OnPropertyChanged("PixelData");
        }
    }

    [DataMember]
    public override byte[] FileData
    {
        get
        {
            if (this.PixelData == null)
            {
                return null;
            }

            return ListHelper.ConvertToByteArray(this.PixelData);
        }
        set
        {
            if (value == null)
            {
                this.PixelData = null;
                return;
            }

            this.PixelData = ListHelper.ConvertToUshortArray(value);
        }
    }

}

请注意,只有FileData属性被标记为[DataMember],因此PixelData属性未被序列化!

以下是服务器app.config的相关部分:

<system.serviceModel>
    <services>
        <service name="Services.ImageDataService" behaviorConfiguration="ServicesBehavior">
            <host>
                <baseAddresses>
                    <add baseAddress="net.tcp://localhost:8008/ImageDataService" />
                </baseAddresses>
            </host>
            <endpoint address="" binding="netTcpBinding" bindingConfiguration="NetTcpBindingLargeFileTransfer" contract="Services.IImageDataService" />
            <endpoint address="mex" binding="mexTcpBinding" bindingConfiguration="" contract="IMetadataExchange" />
        </service>
    </services>
    <behaviors>
        <serviceBehaviors>
            <behavior name="ServicesBehavior">
                <serviceMetadata httpGetEnabled="false" />
                <serviceDebug includeExceptionDetailInFaults="false" />
                <dataContractSerializer maxItemsInObjectGraph="2147483647"/>
            </behavior>
        </serviceBehaviors>
    </behaviors>
    <bindings>
        <netTcpBinding>
            <binding
                name="NetTcpBindingLargeFileTransfer"
                openTimeout="00:01:00" closeTimeout="00:01:00" receiveTimeout="infinite" sendTimeout="infinite"
                transactionFlow="false" transactionProtocol="OleTransactions"
                transferMode="Buffered" hostNameComparisonMode="StrongWildcard" listenBacklog="10"
                maxBufferPoolSize="2097152" maxBufferSize="1073741824" maxConnections="10" maxReceivedMessageSize="1073741824">
                <readerQuotas
                    maxDepth="2147483647" maxStringContentLength="2147483647"
                    maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
                <reliableSession ordered="true" inactivityTimeout="infinite" enabled="false" />
                <security mode="None">
                    <transport clientCredentialType="Windows" protectionLevel="EncryptAndSign" />
                    <message clientCredentialType="Windows" />
                </security>
            </binding>
        </netTcpBinding>
    </bindings>
</system.serviceModel>

客户端的app.config

<system.serviceModel>
    <bindings>
        <netTcpBinding>
            <binding
                name="NetTcpBindingLargeFileTransfer"
                openTimeout="00:01:00" closeTimeout="00:01:00" receiveTimeout="infinite" sendTimeout="00:10:00"
                transactionFlow="false" transactionProtocol="OleTransactions"
                transferMode="Buffered" hostNameComparisonMode="StrongWildcard" listenBacklog="10"
                maxBufferPoolSize="2097152" maxBufferSize="1073741824" maxConnections="10" maxReceivedMessageSize="1073741824">
                <readerQuotas
                    maxDepth="2147483647" maxStringContentLength="2147483647"
                    maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
                <reliableSession ordered="true" inactivityTimeout="infinite" enabled="false" />
                <security mode="None">
                    <transport clientCredentialType="Windows" protectionLevel="EncryptAndSign" />
                    <message clientCredentialType="Windows" />
                </security>
            </binding>
        </netTcpBinding>
    </bindings>
    <client>
        <endpoint
            address="net.tcp://localhost:8008/ImageDataService"
            binding="netTcpBinding"
            bindingConfiguration="NetTcpBindingLargeFileTransfer"
            contract="Services.IImageDataService"
            name="Services.IImageDataService"
            behaviorConfiguration="ServicesBehavior" />
    </client>
    <behaviors>
        <endpointBehaviors>
            <behavior name="ServicesBehavior">
                <dataContractSerializer maxItemsInObjectGraph="2147483647"></dataContractSerializer>
            </behavior>
        </endpointBehaviors>
    </behaviors>
</system.serviceModel>

2 个答案:

答案 0 :(得分:2)

在同一台机器上尝试命名管道。

Choosing a Transport

答案 1 :(得分:1)

尝试使用命名管道传输进行流式传输。有关详细信息,请参阅此帖Large Data and Streaming

在将数据发送到服务器/客户端之前缓冲数据可能会出现问题。 Streaming将以块的形式发送您的数据。