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POWPF UI thread freezes momentarily when a mouseup event triggers an animation
 

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  1. POWPF UI thread freezes momentarily when a mouseup event triggers an animation
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    <p>I have a WPF application that is constantly animating. One interaction (mouseup) and animation in particular seems to freeze the UI thread for long enough to be very noticable.</p> <p>Concurrency Visualizer shows me my UI thread is blocked for 300 - 500ms. It also shows the stack while it's blocked and the unblocking stack:</p> <p><strong>Main thread stack while frozen</strong>:<br> Category = Synchronization<br> Delay = 495.2472 ms </p> <pre><code>ntoskrnl.exe!SwapContext_PatchXRstor ntoskrnl.exe!KiSwapContext ntoskrnl.exe!KiCommitThreadWait ntoskrnl.exe!KeWaitForSingleObject ntoskrnl.exe!NtWaitForSingleObject ntoskrnl.exe!KiSystemServiceCopyEnd ntdll.dll!NtWaitForSingleObject kernelbase.dll!WaitForSingleObjectEx wpfgfx_v0400.dll!CMilConnection::SynchronizeChannel wpfgfx_v0400.dll!CMilChannel::SyncFlush wpfgfx_v0400.dll!MilComposition_SyncFlush clr.dll!DoNDirectCallWorker presentationcore.dll!System.Windows.Media.Composition.DUCE+Channel.**SyncFlush** presentationcore.dll!System.Windows.Media.MediaContext.NotifyChannelMessage presentationcore.dll!System.Windows.Media.MediaContextNotificationWindow.MessageFilter windowsbase.dll!MS.Win32.HwndWrapper.WndProc windowsbase.dll!MS.Win32.HwndSubclass.DispatcherCallbackOperation windowsbase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall windowsbase.dll!MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen windowsbase.dll!System.Windows.Threading.Dispatcher.WrappedInvoke windowsbase.dll!System.Windows.Threading.Dispatcher.InvokeImpl windowsbase.dll!MS.Win32.HwndSubclass.SubclassWndProc windowsbase.dll!dynamicClass.IL_STUB_ReversePInvoke clr.dll!UMThunkStubAMD64 user32.dll!UserCallWinProcCheckWow user32.dll!DispatchMessageWorker clr.dll!DoNDirectCall__PatchGetThreadCall windowsbase.dll!dynamicClass.IL_STUB_PInvoke windowsbase.dll!System.Windows.Threading.Dispatcher.PushFrameImpl presentationframework.dll!System.Windows.Application.RunInternal presentationframework.dll!System.Windows.Application.Run xqstream.windows.exe!IQ.IR.Stream.WPF.App.Main </code></pre> <p><strong>Unblocking Stack:</strong></p> <pre><code>ntoskrnl.exe! ?? ?? ::FNODOBFM::`string' ntoskrnl.exe!NtSetEvent ntoskrnl.exe!KiSystemServiceCopyEnd ntdll.dll!ZwSetEvent kernelbase.dll!SetEvent wpfgfx_v0400.dll!CMilConnection::PostMessageToClient wpfgfx_v0400.dll!CMilServerChannel::SignalFinishedFlush wpfgfx_v0400.dll!CComposition::FlushChannels wpfgfx_v0400.dll!CPartitionThread::RenderPartition wpfgfx_v0400.dll!CPartitionThread::Run wpfgfx_v0400.dll!CPartitionThread::ThreadMain </code></pre> <p>The main thread is waiting on a background thread. That background thread is doing a number of things, but this stack takes up ~3/4 of the time:</p> <p><strong>Blocking thread's largest task:</strong> Category = I/O<br> Delay = 347.5122 ms </p> <pre><code>ntoskrnl.exe!SwapContext_PatchXRstor ntoskrnl.exe!KiSwapContext ntoskrnl.exe!KiCommitThreadWait ntoskrnl.exe!KeWaitForSingleObject dxgmms1.sys!VIDMM_GLOBAL::CloseOneAllocation dxgmms1.sys!VidMmCloseAllocation dxgkrnl.sys!DXGDEVICE::DestroyAllocations dxgkrnl.sys!DXGDEVICE::ProcessTerminationList dxgkrnl.sys!DXGDEVICE::TerminateAllocations dxgkrnl.sys!DXGDEVICE::DestroyAllocation dxgkrnl.sys!DxgkDestroyAllocation win32k.sys!NtGdiDdDDIDestroyAllocation ntoskrnl.exe!KiSystemServiceCopyEnd gdi32.dll!ZwGdiDdDDIDestroyAllocation d3d9.dll!DeallocateCB dlumd64.dll![dlumd64.dll] nvd3dumx.dll![nvd3dumx.dll] nvd3dumx.dll![nvd3dumx.dll] nvd3dumx.dll![nvd3dumx.dll] nvd3dumx.dll![nvd3dumx.dll] nvd3dumx.dll![nvd3dumx.dll] nvd3dumx.dll![nvd3dumx.dll] nvd3dumx.dll![nvd3dumx.dll] nvd3dumx.dll![nvd3dumx.dll] dlumd64.dll![dlumd64.dll] dlumd64.dll![dlumd64.dll] d3d9.dll!DdBltLH d3d9.dll!CSwapChain::PresentMain d3d9.dll!CSwapChain::Present wpfgfx_v0400.dll!CD3DDeviceLevel1::PresentWithD3D wpfgfx_v0400.dll!CD3DDeviceLevel1::Present wpfgfx_v0400.dll!CHwDisplayRenderTarget::PresentInternal wpfgfx_v0400.dll!CHwDisplayRenderTarget::Present wpfgfx_v0400.dll!CHwHWNDRenderTarget::Present wpfgfx_v0400.dll!CDesktopRenderTarget::Present wpfgfx_v0400.dll!CDesktopHWNDRenderTarget::Present wpfgfx_v0400.dll!CSlaveHWndRenderTarget::Present wpfgfx_v0400.dll!CRenderTargetManager::Present wpfgfx_v0400.dll!CComposition::Present wpfgfx_v0400.dll!CPartitionThread::PresentPartition wpfgfx_v0400.dll!CPartitionThread::Run wpfgfx_v0400.dll!CPartitionThread::ThreadMain </code></pre> <p>I've read SyncFlush() is called after several MilCore functions and appears to cause the changes that have been sent to be processed immediately (credit to Ray Burns). </p> <p>I'd like to get rid of this freeze, but I'm also hoping to develop a better understanding of what WPF is doing in this situation so that I can build a better mental model of how WPF works.</p>
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