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,对于大部分流量,客户端和服务器都在同一台机器上运行,所以我希望传输非常快。
但是,在传输大型数组(16 位灰度图像)时,传输数据需要几秒钟的时间。对于 16 MB 的图像,大约需要 3-5 秒!
最初,我们使用ushort
数组,因为它是最适合存储 16 位灰度图像数据的数据类型。但是,这非常慢:16 MB 大约需要 20-25 秒。当我们在使用 序列化之前将数据复制到byte
数组Buffer.BlockCopy
时,由于某种原因,它会减少到 3-5 秒。但是,将 16 MB 从一个应用程序传输到在同一台机器上运行的另一个应用程序需要 3-5 秒,这对我来说仍然太长了!
因此,我的问题是:我们如何才能提高这种场景的性能?
我已经从 Marc Gravell 调查了 protobuf-net,但我不确定它在这种情况下是否会有所帮助......有什么经验或其他建议吗?
这是我们的数据类之一(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);
}
}
}
注意只有FileData
属性被标记为[DataMember]
,所以PixelData
属性没有被序列化!
以下是服务器的相关部分app.config
:
<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>
和客户的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>