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POSlow reflection with NHibernate (additional call of CodeAccessSecurityEngine)
 

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    <p>I've got serious problem with our application. We are developing GUI application + server which can be used in two different purposes.</p> <ol> <li>GUI application invoking embedded server which runs in the same process as embedded server</li> <li>GUI application is communicated with separated standalone server application via REST - separated process.</li> </ol> <p>We are using spring.net so there are small differences between both solutions. Server is just one context so the solution #1 instantiates it directly as new spring.net context and solution #2 has two exe files: GUI.exe + standalone server exe. As I already said, both application flows are almost the same.</p> <p>Whats the issue? Standalone server is three times slower than solution #1. It means separated standalone server application is three times slower than embedded one.</p> <p>I've used DotTrace and find the find the reason in 10 minutes. Server uses NHibernate which get/set properties via reflection very often.</p> <p>In the first solution when GUI application hosted in embedded server, reflection is very quick. But when it's on separate standalone server perform, reflections tasks are very slow.</p> <p>Here are stack traces for slow solution:</p> <pre><code> - 5,874 ms System.RuntimeMethodHandle.PerformSecurityCheck(Object, IRuntimeMethodInfo, RuntimeType, UInt32) - 4,642 ms System.Security.CodeAccessSecurityEngine.ReflectionTargetDemandHelper(Int32, PermissionSet) - 36ms System.Security.CodeAccessSecurityEngine.CheckSetHelper(CompressedStack, PermissionSet, PermissionSet, PermissionSet, RuntimeMethodHandleInternal, RuntimeAssembly, SecurityAction) - 1ms System.Reflection.RuntimeMethodInfo.get_Value </code></pre> <p>Fast solution:</p> <pre><code> - 5 ms • 10,740 calls • System.RuntimeMethodHandle.PerformSecurityCheck(Object, IRuntimeMethodInfo, RuntimeType, UInt32) - 1 ms • 10,740 calls • System.Reflection.RuntimeMethodInfo.get_Value </code></pre> <p>As you can see, the slow solution killer is the aditional call to System.Security.CodeAccessSecurityEngine.ReflectionTargetDemandHelper. Standalone server should automatically run as full trusted as well as GUI does.</p> <p>Do you have any solutions how to switch this check off or how to set up the standalone server application? When I compare both app.configs, i'm not able to find any difference regarding described issue.</p> <p>EDIT:</p> <p>We have finally investigated the reason and the solution was the only clear.</p> <p>Standalone server instantiates spring.net's context with using <strong>ContextRegistry.GetContext()</strong> but embedded one uses standard <strong>new XmlApplicationContext(new[] {"..."})</strong>. This simple difference results into so significant performance hit.</p> <p>It seems that spring's app.config context handler do "any wrong stuff" but we have not time to investigate the real purpose yet.</p>
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