我们在两个服务器之间进行负载均衡,调用托管在单个IIS7应用服务器上的WCF wsHttp服务。
上周,该网站推出,我们遇到了性能问题。
该系统是由一支离岸团队建造的,但我被要求调查是否可以提供帮助。
我加载了perfmon并使用asp.net计数器查看当前会话。我可以看到,一旦这个增加到大约25以上,那么网站的速度会大大减慢。在接下来的10分钟内,它会继续增加到大约250,然后会降到0,并且网站的性能会很好。
这在一个循环中持续 - 坏消息!
第二天,离岸团队告诉我他们已经通过调整安全问题来解决问题。
我有一个理论认为,在禁用wsHttp绑定WCF的安全性时,从每个会话创建一个实例变为每个调用创建一个实例 - 从而允许更大的服务请求吞吐量。这是一个很好的理论吗?
我构建了一个简单的模型来测试它,IIS中托管的几个方法和生成多个请求的简单客户端。这似乎给出了我预期的结果。问题是,当我没有使用安全绑定时,我很难找到正确的perfmon计数器来证明排队的请求更少,创建的并发实例更多。
有人可以建议使用最好的perfmon计数器吗?
好的,关于这一天的另一天还有更多问题!
在我的测试应用程序中,我现在有3个服务类,包含3个不同的wsHttp绑定
在客户端的40循环内,我启动一个新线程并调用该服务。当呼叫服务1时,服务在1秒内完成所有请求。
当呼叫服务2时,该服务在33秒内完成所有请求。
当调用服务3时,我希望它几乎和服务1一样快,因为我希望服务为4个调用中的每个调用实例化一个新的服务对象。但是,它似乎没有(我仍然没有任何有意义的perfmon计数器!)这样做,总完成时间也是33秒。
以下是服务的配置:
<?xml version="1.0"?>
<configuration>
<system.diagnostics>
<sources>
<source name="System.ServiceModel"
switchValue="Information, ActivityTracing"
propagateActivity="true" >
<listeners>
<add name="traceListener"
type="System.Diagnostics.XmlWriterTraceListener"
initializeData="c:\WCFTrace\InstancingDemo.svclog" />
</listeners>
</source>
</sources>
</system.diagnostics>
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior name="SecPerCallBehaviour">
<serviceThrottling maxConcurrentSessions="1000"
maxConcurrentCalls="30"
maxConcurrentInstances="30"/>
<serviceMetadata httpGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="false" />
</behavior>
<behavior name="">
<serviceMetadata httpGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="false" />
</behavior>
</serviceBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
<bindings>
<wsHttpBinding>
<binding name="BindingNoSec">
<security mode="None" />
</binding>
<binding name="BindingMessageSec">
<security mode="Message">
<message establishSecurityContext ="true"/>
</security>
</binding>
<binding name="BindingMessageSecPerCall" >
<security mode="Message">
<message establishSecurityContext ="true"/>
</security>
</binding>
</wsHttpBinding>
</bindings>
<services>
<service name="ServiceInstancingDemo.Service1">
<endpoint address="~/Service1.svc"
binding="wsHttpBinding" bindingConfiguration="BindingNoSec"
name="NoSecurity" contract="ServiceInstancingDemo.IService1" />
</service>
<service name="ServiceInstancingDemo.Service2">
<endpoint address="~/Service2.svc"
binding="wsHttpBinding" bindingConfiguration="BindingMessageSec"
contract="ServiceInstancingDemo.IService2" />
</service>
<service name="ServiceInstancingDemo.Service3" behaviorConfiguration="SecPerCallBehaviour">
<endpoint address="~/Service3.svc"
binding="wsHttpBinding" bindingConfiguration="BindingMessageSecPerCall"
contract="ServiceInstancingDemo.IService3" />
</service>
</services>
</system.serviceModel>
</configuration>
这是来自客户端的配置:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.serviceModel>
<bindings>
<wsHttpBinding>
<binding name="WSHttpBinding_IService2" closeTimeout="00:01:00"
openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard"
maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true"
allowCookies="false">
<readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
maxBytesPerRead="4096" maxNameTableCharCount="16384" />
<reliableSession ordered="true" inactivityTimeout="00:10:00"
enabled="false" />
<security mode="Message">
<transport clientCredentialType="Windows" proxyCredentialType="None"
realm="" />
<message clientCredentialType="Windows" negotiateServiceCredential="true"
algorithmSuite="Default" establishSecurityContext="true" />
</security>
</binding>
<binding name="NoSecurity" closeTimeout="00:01:00" openTimeout="00:01:00"
receiveTimeout="00:10:00" sendTimeout="00:01:00" bypassProxyOnLocal="false"
transactionFlow="false" hostNameComparisonMode="StrongWildcard"
maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true"
allowCookies="false">
<readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
maxBytesPerRead="4096" maxNameTableCharCount="16384" />
<reliableSession ordered="true" inactivityTimeout="00:10:00"
enabled="false" />
<security mode="None">
<transport clientCredentialType="Windows" proxyCredentialType="None"
realm="" />
<message clientCredentialType="Windows" negotiateServiceCredential="true" />
</security>
</binding>
<binding name="WSHttpBinding_IService3" closeTimeout="00:01:00"
openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard"
maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true"
allowCookies="false">
<readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
maxBytesPerRead="4096" maxNameTableCharCount="16384" />
<reliableSession ordered="true" inactivityTimeout="00:10:00"
enabled="false" />
<security mode="Message">
<transport clientCredentialType="Windows" proxyCredentialType="None"
realm="" />
<message clientCredentialType="Windows" negotiateServiceCredential="true"
algorithmSuite="Default" />
</security>
</binding>
</wsHttpBinding>
</bindings>
<client>
<endpoint address="http://rb-t510/NGCInstancing/Service2.svc/~/Service2.svc"
binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IService2"
contract="NGCWithSec.IService2" name="WSHttpBinding_IService2">
<identity>
<servicePrincipalName value="host/RB-T510" />
</identity>
</endpoint>
<endpoint address="http://rb-t510/NGCInstancing/Service1.svc/~/Service1.svc"
binding="wsHttpBinding" bindingConfiguration="NoSecurity"
contract="NGC.IService1" name="NoSecurity" />
<endpoint address="http://localhost/NGCInstancing/Service3.svc/~/Service3.svc"
binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IService3"
contract="NGCSecPerCall.IService3" name="WSHttpBinding_IService3">
<identity>
<servicePrincipalName value="host/RB-T510" />
</identity>
</endpoint>
</client>
</system.serviceModel>
</configuration>
我猜我错过了配置设置?或者,使用wsHttp上的消息安全性进行的多次调用总是会非常慢,因为每个会话必须实例化服务器对象,并且每个客户端只创建一个会话?
非常感谢
罗布。
答案 0 :(得分:1)
您需要的计数器必须在您的服务中明确启用:
<configuration>
<system.serviceModel>
<diagnostics performanceCounters="All" />
</system.serviceModel>
</configuration>
显然它也可以更精细。这是您想要阅读的内容:WCF Performance Counters
<强>更新强>: 更好的链接:How to use performance counters to diagnose performance of WCF applications