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自從幾個星期以來，我面臨着一個巨大的問題。我是一個在IIS7（W2008 SP1）下託管的asp.net應用程序，並且每隔幾個小時它就會開始佔用接近50％的CPU，這時可能沒有用戶連接。 這是可以理解的，因爲我們使用Quartz.net來做一些應用程序recicling，但是我們不能再現問題。ASP.NET：無負載下CPU佔用率高
這裏是JetBrains公司dotTrace 3.1製成，而CPU是高蹤：http://mycenter.info/tmp/DotTraceSnapshot.zip
通常在過程中浪費CPU是w3wp.exe的，但在過去幾天SQLSERVER（2008）和分佈式緩存（1.2。 1，並在週一更新到1.2.4測試版）也在殺死CPU。 奇怪的是有些時候memcached開始消耗100％，其統計數據表明它很安靜，但是當請求發生時它可以正常工作。
Here's故障轉儲W3WP的（或堆棧跟蹤轉儲），使用的WinDbg： （基於本指南：http://blogs.technet.com/marcelofartura/archive/2006/09/15/troubleshooting-iis-100-cpu-issues-step-by-step-intermediary.aspx）
0:000> ~
. 0 Id: 1be4.1d3c Suspend: 1 Teb: 7ffdf000 Unfrozen
1 Id: 1be4.b1c Suspend: 1 Teb: 7ffde000 Unfrozen
2 Id: 1be4.12a0 Suspend: 1 Teb: 7ffdd000 Unfrozen
3 Id: 1be4.19d0 Suspend: 1 Teb: 7ffdc000 Unfrozen
4 Id: 1be4.1714 Suspend: 1 Teb: 7ffd7000 Unfrozen
5 Id: 1be4.1a18 Suspend: 1 Teb: 7ffd6000 Unfrozen
6 Id: 1be4.12ac Suspend: 1 Teb: 7ffd5000 Unfrozen
7 Id: 1be4.dec Suspend: 1 Teb: 7ffd4000 Unfrozen
8 Id: 1be4.1e48 Suspend: 1 Teb: 7ffd8000 Unfrozen
9 Id: 1be4.1ca8 Suspend: 1 Teb: 7ffd3000 Unfrozen
10 Id: 1be4.1508 Suspend: 1 Teb: 7ffaf000 Unfrozen
11 Id: 1be4.1bc0 Suspend: 1 Teb: 7ffae000 Unfrozen
12 Id: 1be4.1f48 Suspend: 1 Teb: 7ffad000 Unfrozen
13 Id: 1be4.1994 Suspend: 1 Teb: 7ffac000 Unfrozen
14 Id: 1be4.1a48 Suspend: 1 Teb: 7ffab000 Unfrozen
15 Id: 1be4.12c8 Suspend: 1 Teb: 7ffa8000 Unfrozen
16 Id: 1be4.e44 Suspend: 1 Teb: 7ffa7000 Unfrozen
17 Id: 1be4.19e0 Suspend: 1 Teb: 7ffa6000 Unfrozen
18 Id: 1be4.19b0 Suspend: 1 Teb: 7ffa2000 Unfrozen
19 Id: 1be4.1b30 Suspend: 1 Teb: 7ffd9000 Unfrozen
20 Id: 1be4.1bfc Suspend: 1 Teb: 7ffa3000 Unfrozen
21 Id: 1be4.1be8 Suspend: 1 Teb: 7ffa1000 Unfrozen
22 Id: 1be4.1a54 Suspend: 1 Teb: 7ffa5000 Unfrozen
23 Id: 1be4.b74 Suspend: 1 Teb: 7ff3d000 Unfrozen
24 Id: 1be4.19b4 Suspend: 1 Teb: 7ff3c000 Unfrozen
25 Id: 1be4.1460 Suspend: 1 Teb: 7ffdb000 Unfrozen
26 Id: 1be4.1eac Suspend: 1 Teb: 7ffaa000 Unfrozen
27 Id: 1be4.1b90 Suspend: 1 Teb: 7ffa4000 Unfrozen
0:023> #23s
Search address set to 77dc9a94
*** WARNING: Unable to verify checksum for SMDiagnostics.ni.dll
*** WARNING: Unable to verify checksum for System.Data.ni.dll
*** ERROR: Module load completed but symbols could not be loaded for Microsoft.Web.Services3.DLL
*** WARNING: Unable to verify checksum for System.Windows.Forms.ni.dll
*** WARNING: Unable to verify checksum for System.Web.ni.dll
*** WARNING: Unable to verify checksum for Ademy.UI.Web.DLL
*** ERROR: Module load completed but symbols could not be loaded for AjaxControlToolkit.DLL
*** ERROR: Module load completed but symbols could not be loaded for 7zSharp.DLL
*** WARNING: Unable to verify checksum for mscorlib.ni.dll
*** ERROR: Module load completed but symbols could not be loaded for Iesi.Collections.DLL
*** WARNING: Unable to verify checksum for System.Design.ni.dll
*** WARNING: Unable to verify checksum for System.Core.ni.dll
*** WARNING: Unable to verify checksum for Ademy.Event.DLL
*** WARNING: Unable to verify checksum for System.ServiceModel.ni.dll
*** ERROR: Module load completed but symbols could not be loaded for System.ServiceModel.ni.dll
*** WARNING: Unable to verify checksum for App_Theme_Ocean.wgubmrqt.dll
*** WARNING: Unable to verify checksum for NHibernate.Burrow.AppBlock.DLL
*** ERROR: Module load completed but symbols could not be loaded for NHibernate.Burrow.AppBlock.DLL
*** WARNING: Unable to verify checksum for NHibernate.Caches.SysCache2.DLL
*** ERROR: Module load completed but symbols could not be loaded for NHibernate.Caches.SysCache2.DLL
*** WARNING: Unable to verify checksum for Ademy.UI.Web.Controls.DLL
*** WARNING: Unable to verify checksum for Microsoft.JScript.ni.dll
*** WARNING: Unable to verify checksum for System.Web.Mobile.ni.dll
*** WARNING: Unable to verify checksum for System.Runtime.Serialization.ni.dll
^Memory access error in '#23s'
0:023> kb
ChildEBP RetAddr Args to Child
11c6ede4 77dc8ed4 766bc622 0000038c 00000000 ntdll!KiFastSystemCallRet
11c6ede8 766bc622 0000038c 00000000 11c6ee20 ntdll!NtSetEvent+0xc
11c6edf8 011011ef 0000038c 7f52be6e 0fda4888 kernel32!SetEvent+0x10
WARNING: Frame IP not in any known module. Following frames may be wrong.
11c6ee20 71b26ffe 060c5f9c 010039b0 010628a0 0x11011ef
*** WARNING: Unable to verify checksum for System.ni.dll
11c6ee4c 712c4b14 02528958 060c5f9c 11c6ee94 mscorlib_ni+0x216ffe
11c6ee5c 712c4abe 060c5fb0 02528958 060c600c System_ni+0x144b14
11c6ee94 71679260 060c5d24 7167926d 060c5d24 System_ni+0x144abe
11c6eec8 717d8373 060c5d24 11c6f3e8 712c4ce4 System_ni+0x4f9260
11c6ef14 712c4ce4 00000000 02528930 11c6ef74 System_ni+0x658373
11c6ef54 7129dbcb 098b6ac4 11c6efec 72f7eff8 System_ni+0x144ce4
11c6efa4 71b26d66 02df349c 11c6efc0 71b45681 System_ni+0x11dbcb
11c6efb0 71b45681 00000000 0dcfd2d8 11c6efd0 mscorlib_ni+0x216d66
11c6efc0 72f11b4c 766b45f1 00000000 11c6f050 mscorlib_ni+0x235681
11c6efd0 72f221f9 11c6f0a0 00000000 11c6f070 mscorwks!CallDescrWorker+0x33
11c6f050 72f36571 11c6f0a0 00000000 11c6f070 mscorwks!CallDescrWorkerWithHandler+0xa3
11c6f194 72f365a4 71a91ff0 11c6f2c8 11c6f1e8 mscorwks!MethodDesc::CallDescr+0x19c
11c6f1b0 72f365c2 71a91ff0 11c6f2c8 11c6f1e8 mscorwks!MethodDesc::CallTargetWorker+0x1f
11c6f1c8 7302a471 11c6f1e8 68e9b644 0dcfd2d8 mscorwks!MethodDescCallSite::CallWithValueTypes+0x1a
11c6f394 7302a5c6 11c6f424 68e9b194 02df34e4 mscorwks!ExecuteCodeWithGuaranteedCleanupHelper+0x9f
11c6f444 71b45577 11c6f3e8 02df17d0 01c177f8 mscorwks!ReflectionInvocation::ExecuteCodeWithGuaranteedCleanup+0x10f
預先感謝任何尖端!!
UPDATE：
Here's吊死線程的託管堆棧： I'm認爲它看起來像memcached的供應商，但還不確定我該怎麼辦。
0:023> !clrstack
OS Thread Id: 0xb74 (23)
ESP EIP
11c6ee38 77dc9a94 [NDirectMethodFrameStandaloneCleanup: 11c6ee38] Microsoft.Win32.Win32Native.SetEvent(Microsoft.Win32.SafeHandles.SafeWaitHandle)
11c6ee48 71b26ffe System.Threading.EventWaitHandle.Set()
11c6ee54 712c4b14 System.Net.TimerThread.Prod()
11c6ee64 712c4abe System.Net.TimerThread+TimerQueue.CreateTimer(Callback, System.Object)
11c6eea0 71679260 System.Net.ConnectionPool.CleanupCallbackWrapper(Timer, Int32, System.Object)
11c6eed4 717d8373 System.Net.TimerThread+TimerNode.Fire()
11c6ef1c 712c4ce4 System.Net.TimerThread+TimerQueue.Fire(Int32 ByRef)
11c6ef5c 7129dbcb System.Net.TimerThread.ThreadProc()
11c6efac 71b26d66 System.Threading.ThreadHelper.ThreadStart_Context(System.Object)
11c6efb8 71b45681 System.Threading.ExecutionContext.runTryCode(System.Object)
11c6f3e8 72f11b4c [HelperMethodFrame_PROTECTOBJ: 11c6f3e8] System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode, CleanupCode, System.Object)
11c6f450 71b45577 System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
11c6f46c 71b301c5 System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
11c6f484 71b26ce4 System.Threading.ThreadHelper.ThreadStart()
11c6f6b0 72f11b4c [GCFrame: 11c6f6b0]
11c6f9a0 72f11b4c [ContextTransitionFrame: 11c6f9a0]
發現的解決方案：
在Windows上運行2008年我更新到1.2.6時，這是由於爲Win32 memcached的中1.2.1的一個bug，和一切工作。我想我看到了w3wp進程，因爲我用來連接到memcached的庫有一個掛起的回收進程，即使memcached仍在響應。
SOLUTION 2 FOUND：
如果第一個解決方案不起作用，請閱讀THIS POST。我想memcached解決方案只是隱藏真正的問題，這是SmtpClient中的一個錯誤。
謝謝！ 「〜* e！clrstack」輸出「找不到導出clrstack」約20次，並且！runaway顯示線程（＃23/Id：1be4.b74）運行10分鐘。我不知道這個命令，但我可以看出這是文章中描述的步驟後面的錯誤。 有沒有其他想法？我怎樣才能使〜！e！clrstack工作？ – 2009-09-23 19:16:50
謝謝！我已經添加了託管堆棧的問題，但它不是我的代碼是消耗CPU .. :( – 2009-09-24 13:43:24
我找到了解決方案（見上文），感謝您的幫助！ – 2009-09-28 13:14:32