Merge pull request #10858 from jherico/trace_cores

Additional threaded tracing of CPU cores

interface/src/Application.cpp

@@ -25,6 +25,7 @@
 #include <QtCore/QCommandLineParser>
 #include <QtCore/QMimeData>
 #include <QtCore/QThreadPool>
+#include <QtConcurrent/QtConcurrentRun>
 
 #include <QtGui/QScreen>
 #include <QtGui/QWindow>
@@ -2164,48 +2165,74 @@ void Application::paintGL() {
         return;
     }
 
-    auto displayPlugin = getActiveDisplayPlugin();
+    DisplayPluginPointer displayPlugin;
-    // FIXME not needed anymore?
+    {
-    _offscreenContext->makeCurrent();
+        PROFILE_RANGE(render, "/getActiveDisplayPlugin");
+        displayPlugin = getActiveDisplayPlugin();
+    }
 
-    // If a display plugin loses it's underlying support, it
+    {
-    // needs to be able to signal us to not use it
+        PROFILE_RANGE(render, "/offscreenMakeCurrent");
-    if (!displayPlugin->beginFrameRender(_frameCount)) {
+        // FIXME not needed anymore?
-        _inPaint = false;
+        _offscreenContext->makeCurrent();
-        updateDisplayMode();
+    }
-        return;
+
+    {
+        PROFILE_RANGE(render, "/pluginBeginFrameRender");
+        // If a display plugin loses it's underlying support, it
+        // needs to be able to signal us to not use it
+        if (!displayPlugin->beginFrameRender(_frameCount)) {
+            _inPaint = false;
+            updateDisplayMode();
+            return;
+        }
     }
 
     // update the avatar with a fresh HMD pose
-    getMyAvatar()->updateFromHMDSensorMatrix(getHMDSensorPose());
+    {
+        PROFILE_RANGE(render, "/updateAvatar");
+        getMyAvatar()->updateFromHMDSensorMatrix(getHMDSensorPose());
+    }
 
     auto lodManager = DependencyManager::get<LODManager>();
 
+    RenderArgs renderArgs;
     {
-        QMutexLocker viewLocker(&_viewMutex);
+        PROFILE_RANGE(render, "/buildFrustrumAndArgs");
-        _viewFrustum.calculate();
+        {
-    }
+            QMutexLocker viewLocker(&_viewMutex);
-    RenderArgs renderArgs(_gpuContext, getEntities(), lodManager->getOctreeSizeScale(),
+            _viewFrustum.calculate();
-                          lodManager->getBoundaryLevelAdjust(), RenderArgs::DEFAULT_RENDER_MODE,
+        }
-                          RenderArgs::MONO, RenderArgs::RENDER_DEBUG_NONE);
+        renderArgs = RenderArgs(_gpuContext, getEntities(), lodManager->getOctreeSizeScale(),
-    {
+            lodManager->getBoundaryLevelAdjust(), RenderArgs::DEFAULT_RENDER_MODE,
-        QMutexLocker viewLocker(&_viewMutex);
+            RenderArgs::MONO, RenderArgs::RENDER_DEBUG_NONE);
-        renderArgs.setViewFrustum(_viewFrustum);
+        {
+            QMutexLocker viewLocker(&_viewMutex);
+            renderArgs.setViewFrustum(_viewFrustum);
+        }
     }
 
-    PerformanceWarning::setSuppressShortTimings(Menu::getInstance()->isOptionChecked(MenuOption::SuppressShortTimings));
+    {
-    bool showWarnings = Menu::getInstance()->isOptionChecked(MenuOption::PipelineWarnings);
+        PROFILE_RANGE(render, "/resizeGL");
-    PerformanceWarning warn(showWarnings, "Application::paintGL()");
+        PerformanceWarning::setSuppressShortTimings(Menu::getInstance()->isOptionChecked(MenuOption::SuppressShortTimings));
-    resizeGL();
+        bool showWarnings = Menu::getInstance()->isOptionChecked(MenuOption::PipelineWarnings);
-
+        PerformanceWarning warn(showWarnings, "Application::paintGL()");
-    _gpuContext->beginFrame(getHMDSensorPose());
+        resizeGL();
-    // Reset the gpu::Context Stages
+    }
-    // Back to the default framebuffer;
-    gpu::doInBatch(_gpuContext, [&](gpu::Batch& batch) {
-        batch.resetStages();
-    });
 
     {
+        PROFILE_RANGE(render, "/gpuContextReset");
+        _gpuContext->beginFrame(getHMDSensorPose());
+        // Reset the gpu::Context Stages
+        // Back to the default framebuffer;
+        gpu::doInBatch(_gpuContext, [&](gpu::Batch& batch) {
+            batch.resetStages();
+        });
+    }
+
+
+    {
+        PROFILE_RANGE(render, "/renderOverlay");
         PerformanceTimer perfTimer("renderOverlay");
         // NOTE: There is no batch associated with this renderArgs
         // the ApplicationOverlay class assumes it's viewport is setup to be the device size
@@ -2216,114 +2243,127 @@ void Application::paintGL() {
 
     glm::vec3 boomOffset;
     {
-        PerformanceTimer perfTimer("CameraUpdates");
+        PROFILE_RANGE(render, "/updateCamera");
+        {
+            PerformanceTimer perfTimer("CameraUpdates");
 
-        auto myAvatar = getMyAvatar();
+            auto myAvatar = getMyAvatar();
-        boomOffset = myAvatar->getScale() * myAvatar->getBoomLength() * -IDENTITY_FORWARD;
+            boomOffset = myAvatar->getScale() * myAvatar->getBoomLength() * -IDENTITY_FORWARD;
 
-        if (_myCamera.getMode() == CAMERA_MODE_FIRST_PERSON || _myCamera.getMode() == CAMERA_MODE_THIRD_PERSON) {
+            if (_myCamera.getMode() == CAMERA_MODE_FIRST_PERSON || _myCamera.getMode() == CAMERA_MODE_THIRD_PERSON) {
-            Menu::getInstance()->setIsOptionChecked(MenuOption::FirstPerson, myAvatar->getBoomLength() <= MyAvatar::ZOOM_MIN);
+                Menu::getInstance()->setIsOptionChecked(MenuOption::FirstPerson, myAvatar->getBoomLength() <= MyAvatar::ZOOM_MIN);
-            Menu::getInstance()->setIsOptionChecked(MenuOption::ThirdPerson, !(myAvatar->getBoomLength() <= MyAvatar::ZOOM_MIN));
+                Menu::getInstance()->setIsOptionChecked(MenuOption::ThirdPerson, !(myAvatar->getBoomLength() <= MyAvatar::ZOOM_MIN));
-            cameraMenuChanged();
+                cameraMenuChanged();
-        }
-
-        // The render mode is default or mirror if the camera is in mirror mode, assigned further below
-        renderArgs._renderMode = RenderArgs::DEFAULT_RENDER_MODE;
-
-        // Always use the default eye position, not the actual head eye position.
-        // Using the latter will cause the camera to wobble with idle animations,
-        // or with changes from the face tracker
-        if (_myCamera.getMode() == CAMERA_MODE_FIRST_PERSON) {
-            if (isHMDMode()) {
-                mat4 camMat = myAvatar->getSensorToWorldMatrix() * myAvatar->getHMDSensorMatrix();
-                _myCamera.setPosition(extractTranslation(camMat));
-                _myCamera.setOrientation(glm::quat_cast(camMat));
-            } else {
-                _myCamera.setPosition(myAvatar->getDefaultEyePosition());
-                _myCamera.setOrientation(myAvatar->getMyHead()->getHeadOrientation());
             }
-        } else if (_myCamera.getMode() == CAMERA_MODE_THIRD_PERSON) {
-            if (isHMDMode()) {
-                auto hmdWorldMat = myAvatar->getSensorToWorldMatrix() * myAvatar->getHMDSensorMatrix();
-                _myCamera.setOrientation(glm::normalize(glm::quat_cast(hmdWorldMat)));
-                _myCamera.setPosition(extractTranslation(hmdWorldMat) +
-                    myAvatar->getOrientation() * boomOffset);
-            } else {
-                _myCamera.setOrientation(myAvatar->getHead()->getOrientation());
-                if (Menu::getInstance()->isOptionChecked(MenuOption::CenterPlayerInView)) {
-                    _myCamera.setPosition(myAvatar->getDefaultEyePosition()
-                        + _myCamera.getOrientation() * boomOffset);
-                } else {
-                    _myCamera.setPosition(myAvatar->getDefaultEyePosition()
-                        + myAvatar->getOrientation() * boomOffset);
-                }
-            }
-        } else if (_myCamera.getMode() == CAMERA_MODE_MIRROR) {
-            if (isHMDMode()) {
-                auto mirrorBodyOrientation = myAvatar->getWorldAlignedOrientation() * glm::quat(glm::vec3(0.0f, PI + _rotateMirror, 0.0f));
 
-                glm::quat hmdRotation = extractRotation(myAvatar->getHMDSensorMatrix());
+            // The render mode is default or mirror if the camera is in mirror mode, assigned further below
-                // Mirror HMD yaw and roll
+            renderArgs._renderMode = RenderArgs::DEFAULT_RENDER_MODE;
-                glm::vec3 mirrorHmdEulers = glm::eulerAngles(hmdRotation);
-                mirrorHmdEulers.y = -mirrorHmdEulers.y;
-                mirrorHmdEulers.z = -mirrorHmdEulers.z;
-                glm::quat mirrorHmdRotation = glm::quat(mirrorHmdEulers);
 
-                glm::quat worldMirrorRotation = mirrorBodyOrientation * mirrorHmdRotation;
+            // Always use the default eye position, not the actual head eye position.
-
+            // Using the latter will cause the camera to wobble with idle animations,
-                _myCamera.setOrientation(worldMirrorRotation);
+            // or with changes from the face tracker
-
+            if (_myCamera.getMode() == CAMERA_MODE_FIRST_PERSON) {
-                glm::vec3 hmdOffset = extractTranslation(myAvatar->getHMDSensorMatrix());
-                // Mirror HMD lateral offsets
-                hmdOffset.x = -hmdOffset.x;
-
-                _myCamera.setPosition(myAvatar->getDefaultEyePosition()
-                    + glm::vec3(0, _raiseMirror * myAvatar->getUniformScale(), 0)
-                   + mirrorBodyOrientation * glm::vec3(0.0f, 0.0f, 1.0f) * MIRROR_FULLSCREEN_DISTANCE * _scaleMirror
-                   + mirrorBodyOrientation * hmdOffset);
-            } else {
-                _myCamera.setOrientation(myAvatar->getWorldAlignedOrientation()
-                    * glm::quat(glm::vec3(0.0f, PI + _rotateMirror, 0.0f)));
-                _myCamera.setPosition(myAvatar->getDefaultEyePosition()
-                    + glm::vec3(0, _raiseMirror * myAvatar->getUniformScale(), 0)
-                    + (myAvatar->getOrientation() * glm::quat(glm::vec3(0.0f, _rotateMirror, 0.0f))) *
-                    glm::vec3(0.0f, 0.0f, -1.0f) * MIRROR_FULLSCREEN_DISTANCE * _scaleMirror);
-            }
-            renderArgs._renderMode = RenderArgs::MIRROR_RENDER_MODE;
-        } else if (_myCamera.getMode() == CAMERA_MODE_ENTITY) {
-            EntityItemPointer cameraEntity = _myCamera.getCameraEntityPointer();
-            if (cameraEntity != nullptr) {
                 if (isHMDMode()) {
-                    glm::quat hmdRotation = extractRotation(myAvatar->getHMDSensorMatrix());
+                    mat4 camMat = myAvatar->getSensorToWorldMatrix() * myAvatar->getHMDSensorMatrix();
-                    _myCamera.setOrientation(cameraEntity->getRotation() * hmdRotation);
+                    _myCamera.setPosition(extractTranslation(camMat));
-                    glm::vec3 hmdOffset = extractTranslation(myAvatar->getHMDSensorMatrix());
+                    _myCamera.setOrientation(glm::quat_cast(camMat));
-                    _myCamera.setPosition(cameraEntity->getPosition() + (hmdRotation * hmdOffset));
                 } else {
-                    _myCamera.setOrientation(cameraEntity->getRotation());
+                    _myCamera.setPosition(myAvatar->getDefaultEyePosition());
-                    _myCamera.setPosition(cameraEntity->getPosition());
+                    _myCamera.setOrientation(myAvatar->getMyHead()->getHeadOrientation());
+                }
+            } else if (_myCamera.getMode() == CAMERA_MODE_THIRD_PERSON) {
+                if (isHMDMode()) {
+                    auto hmdWorldMat = myAvatar->getSensorToWorldMatrix() * myAvatar->getHMDSensorMatrix();
+                    _myCamera.setOrientation(glm::normalize(glm::quat_cast(hmdWorldMat)));
+                    _myCamera.setPosition(extractTranslation(hmdWorldMat) +
+                        myAvatar->getOrientation() * boomOffset);
+                } else {
+                    _myCamera.setOrientation(myAvatar->getHead()->getOrientation());
+                    if (Menu::getInstance()->isOptionChecked(MenuOption::CenterPlayerInView)) {
+                        _myCamera.setPosition(myAvatar->getDefaultEyePosition()
+                            + _myCamera.getOrientation() * boomOffset);
+                    } else {
+                        _myCamera.setPosition(myAvatar->getDefaultEyePosition()
+                            + myAvatar->getOrientation() * boomOffset);
+                    }
+                }
+            } else if (_myCamera.getMode() == CAMERA_MODE_MIRROR) {
+                if (isHMDMode()) {
+                    auto mirrorBodyOrientation = myAvatar->getWorldAlignedOrientation() * glm::quat(glm::vec3(0.0f, PI + _rotateMirror, 0.0f));
+
+                    glm::quat hmdRotation = extractRotation(myAvatar->getHMDSensorMatrix());
+                    // Mirror HMD yaw and roll
+                    glm::vec3 mirrorHmdEulers = glm::eulerAngles(hmdRotation);
+                    mirrorHmdEulers.y = -mirrorHmdEulers.y;
+                    mirrorHmdEulers.z = -mirrorHmdEulers.z;
+                    glm::quat mirrorHmdRotation = glm::quat(mirrorHmdEulers);
+
+                    glm::quat worldMirrorRotation = mirrorBodyOrientation * mirrorHmdRotation;
+
+                    _myCamera.setOrientation(worldMirrorRotation);
+
+                    glm::vec3 hmdOffset = extractTranslation(myAvatar->getHMDSensorMatrix());
+                    // Mirror HMD lateral offsets
+                    hmdOffset.x = -hmdOffset.x;
+
+                    _myCamera.setPosition(myAvatar->getDefaultEyePosition()
+                        + glm::vec3(0, _raiseMirror * myAvatar->getUniformScale(), 0)
+                        + mirrorBodyOrientation * glm::vec3(0.0f, 0.0f, 1.0f) * MIRROR_FULLSCREEN_DISTANCE * _scaleMirror
+                        + mirrorBodyOrientation * hmdOffset);
+                } else {
+                    _myCamera.setOrientation(myAvatar->getWorldAlignedOrientation()
+                        * glm::quat(glm::vec3(0.0f, PI + _rotateMirror, 0.0f)));
+                    _myCamera.setPosition(myAvatar->getDefaultEyePosition()
+                        + glm::vec3(0, _raiseMirror * myAvatar->getUniformScale(), 0)
+                        + (myAvatar->getOrientation() * glm::quat(glm::vec3(0.0f, _rotateMirror, 0.0f))) *
+                        glm::vec3(0.0f, 0.0f, -1.0f) * MIRROR_FULLSCREEN_DISTANCE * _scaleMirror);
+                }
+                renderArgs._renderMode = RenderArgs::MIRROR_RENDER_MODE;
+            } else if (_myCamera.getMode() == CAMERA_MODE_ENTITY) {
+                EntityItemPointer cameraEntity = _myCamera.getCameraEntityPointer();
+                if (cameraEntity != nullptr) {
+                    if (isHMDMode()) {
+                        glm::quat hmdRotation = extractRotation(myAvatar->getHMDSensorMatrix());
+                        _myCamera.setOrientation(cameraEntity->getRotation() * hmdRotation);
+                        glm::vec3 hmdOffset = extractTranslation(myAvatar->getHMDSensorMatrix());
+                        _myCamera.setPosition(cameraEntity->getPosition() + (hmdRotation * hmdOffset));
+                    } else {
+                        _myCamera.setOrientation(cameraEntity->getRotation());
+                        _myCamera.setPosition(cameraEntity->getPosition());
+                    }
                 }
             }
-        }
+            // Update camera position
-        // Update camera position
+            if (!isHMDMode()) {
-        if (!isHMDMode()) {
+                _myCamera.update(1.0f / _frameCounter.rate());
-            _myCamera.update(1.0f / _frameCounter.rate());
+            }
         }
     }
 
-    getApplicationCompositor().setFrameInfo(_frameCount, _myCamera.getTransform());
+    {
+        PROFILE_RANGE(render, "/updateCompositor");
+        getApplicationCompositor().setFrameInfo(_frameCount, _myCamera.getTransform());
+    }
 
-    // Primary rendering pass
+    gpu::FramebufferPointer finalFramebuffer;
-    auto framebufferCache = DependencyManager::get<FramebufferCache>();
+    QSize finalFramebufferSize;
-    const QSize size = framebufferCache->getFrameBufferSize();
+    {
-    // Final framebuffer that will be handled to the display-plugin
+        PROFILE_RANGE(render, "/getOutputFramebuffer");
-    auto finalFramebuffer = framebufferCache->getFramebuffer();
+        // Primary rendering pass
+        auto framebufferCache = DependencyManager::get<FramebufferCache>();
+        finalFramebufferSize = framebufferCache->getFrameBufferSize();
+        // Final framebuffer that will be handled to the display-plugin
+        finalFramebuffer = framebufferCache->getFramebuffer();
+    }
 
     {
         PROFILE_RANGE(render, "/mainRender");
         PerformanceTimer perfTimer("mainRender");
         renderArgs._boomOffset = boomOffset;
+        // FIXME is this ever going to be different from the size previously set in the render args
+        // in the overlay render?
         // Viewport is assigned to the size of the framebuffer
-        renderArgs._viewport = ivec4(0, 0, size.width(), size.height());
+        renderArgs._viewport = ivec4(0, 0, finalFramebufferSize.width(), finalFramebufferSize.height());
         if (displayPlugin->isStereo()) {
             // Stereo modes will typically have a larger projection matrix overall,
             // so we ask for the 'mono' projection matrix, which for stereo and HMD
@@ -3623,6 +3663,133 @@ bool Application::shouldPaint(float nsecsElapsed) {
 #include <TCHAR.h>
 #include <pdh.h>
 #pragma comment(lib, "pdh.lib")
+#pragma comment(lib, "ntdll.lib")
+
+extern "C" {
+    enum SYSTEM_INFORMATION_CLASS {
+        SystemBasicInformation = 0,
+        SystemProcessorPerformanceInformation = 8,
+    };
+
+    struct SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION {
+        LARGE_INTEGER IdleTime;
+        LARGE_INTEGER KernelTime;
+        LARGE_INTEGER UserTime;
+        LARGE_INTEGER DpcTime;
+        LARGE_INTEGER InterruptTime;
+        ULONG InterruptCount;
+    };
+
+    struct SYSTEM_BASIC_INFORMATION {
+        ULONG Reserved;
+        ULONG TimerResolution;
+        ULONG PageSize;
+        ULONG NumberOfPhysicalPages;
+        ULONG LowestPhysicalPageNumber;
+        ULONG HighestPhysicalPageNumber;
+        ULONG AllocationGranularity;
+        ULONG_PTR MinimumUserModeAddress;
+        ULONG_PTR MaximumUserModeAddress;
+        ULONG_PTR ActiveProcessorsAffinityMask;
+        CCHAR NumberOfProcessors;
+    };
+
+    NTSYSCALLAPI NTSTATUS NTAPI NtQuerySystemInformation(
+        _In_ SYSTEM_INFORMATION_CLASS SystemInformationClass,
+        _Out_writes_bytes_opt_(SystemInformationLength) PVOID SystemInformation,
+        _In_ ULONG SystemInformationLength,
+        _Out_opt_ PULONG ReturnLength
+    );
+
+}
+template <typename T>
+NTSTATUS NtQuerySystemInformation(SYSTEM_INFORMATION_CLASS SystemInformationClass, T& t) {
+    return NtQuerySystemInformation(SystemInformationClass, &t, (ULONG)sizeof(T), nullptr);
+}
+
+template <typename T>
+NTSTATUS NtQuerySystemInformation(SYSTEM_INFORMATION_CLASS SystemInformationClass, std::vector<T>& t) {
+    return NtQuerySystemInformation(SystemInformationClass, t.data(), (ULONG)(sizeof(T) * t.size()), nullptr);
+}
+
+
+template <typename T>
+void updateValueAndDelta(std::pair<T, T>& pair, T newValue) {
+    auto& value = pair.first;
+    auto& delta = pair.second;
+    delta = (value != 0) ? newValue - value : 0;
+    value = newValue;
+}
+
+struct MyCpuInfo {
+    using ValueAndDelta = std::pair<LONGLONG, LONGLONG>;
+    std::string name;
+    ValueAndDelta kernel { 0, 0 };
+    ValueAndDelta user { 0, 0 };
+    ValueAndDelta idle { 0, 0 };
+    float kernelUsage { 0.0f };
+    float userUsage { 0.0f };
+
+    void update(const SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION& cpuInfo) {
+        updateValueAndDelta(kernel, cpuInfo.KernelTime.QuadPart);
+        updateValueAndDelta(user, cpuInfo.UserTime.QuadPart);
+        updateValueAndDelta(idle, cpuInfo.IdleTime.QuadPart);
+        auto totalTime = kernel.second + user.second + idle.second;
+        if (totalTime != 0) {
+            kernelUsage = (FLOAT)kernel.second / totalTime;
+            userUsage = (FLOAT)user.second / totalTime;
+        } else {
+            kernelUsage = userUsage = 0.0f;
+        }
+    }
+};
+
+void updateCpuInformation() {
+    static std::once_flag once;
+    static SYSTEM_BASIC_INFORMATION systemInfo {};
+    static SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION cpuTotals;
+    static std::vector<SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION> cpuInfos;
+    static std::vector<MyCpuInfo> myCpuInfos;
+    static MyCpuInfo myCpuTotals;
+    std::call_once(once, [&] {
+        NtQuerySystemInformation( SystemBasicInformation, systemInfo);
+        cpuInfos.resize(systemInfo.NumberOfProcessors);
+        myCpuInfos.resize(systemInfo.NumberOfProcessors);
+        for (size_t i = 0; i < systemInfo.NumberOfProcessors; ++i) {
+            myCpuInfos[i].name = "cpu." + std::to_string(i);
+        }
+        myCpuTotals.name = "cpu.total";
+    });
+    NtQuerySystemInformation(SystemProcessorPerformanceInformation, cpuInfos);
+
+    // Zero the CPU totals.
+    memset(&cpuTotals, 0, sizeof(SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION));
+    for (size_t i = 0; i < systemInfo.NumberOfProcessors; ++i) {
+        auto& cpuInfo = cpuInfos[i];
+        // KernelTime includes IdleTime.
+        cpuInfo.KernelTime.QuadPart -= cpuInfo.IdleTime.QuadPart;
+
+        // Update totals
+        cpuTotals.IdleTime.QuadPart += cpuInfo.IdleTime.QuadPart;
+        cpuTotals.KernelTime.QuadPart += cpuInfo.KernelTime.QuadPart;
+        cpuTotals.UserTime.QuadPart += cpuInfo.UserTime.QuadPart;
+
+        // Update friendly structure
+        auto& myCpuInfo = myCpuInfos[i];
+        myCpuInfo.update(cpuInfo);
+        PROFILE_COUNTER(app, myCpuInfo.name.c_str(), { 
+            { "kernel", myCpuInfo.kernelUsage }, 
+            { "user", myCpuInfo.userUsage }
+        });
+    }
+
+    myCpuTotals.update(cpuTotals);
+    PROFILE_COUNTER(app, myCpuTotals.name.c_str(), {
+        { "kernel", myCpuTotals.kernelUsage },
+        { "user", myCpuTotals.userUsage }
+    });
+}
+
 
 static ULARGE_INTEGER lastCPU, lastSysCPU, lastUserCPU;
 static int numProcessors;
@@ -3675,6 +3842,26 @@ void getCpuUsage(vec3& systemAndUser) {
     systemAndUser.z = (float)counterVal.doubleValue;
 }
 
+void setupCpuMonitorThread() {
+    initCpuUsage();
+    auto cpuMonitorThread = QThread::currentThread();
+    
+    QTimer* timer = new QTimer();
+    timer->setInterval(50);
+    QObject::connect(timer, &QTimer::timeout, [] {
+        updateCpuInformation();
+        vec3 kernelUserAndSystem;
+        getCpuUsage(kernelUserAndSystem);
+        PROFILE_COUNTER(app, "cpuProcess", { { "system", kernelUserAndSystem.x }, { "user", kernelUserAndSystem.y } });
+        PROFILE_COUNTER(app, "cpuSystem", { { "system", kernelUserAndSystem.z } });
+    });
+    QObject::connect(cpuMonitorThread, &QThread::finished, [=] {
+        timer->deleteLater();
+        cpuMonitorThread->deleteLater();
+    });
+    timer->start();
+}
+
 #endif
 
 
@@ -3695,15 +3882,17 @@ void Application::idle(float nsecsElapsed) {
     }
 
 #ifdef Q_OS_WIN
+    // If tracing is enabled then monitor the CPU in a separate thread
     static std::once_flag once;
-    std::call_once(once, [] {
+    std::call_once(once, [&] {
-        initCpuUsage();
+        if (trace_app().isDebugEnabled()) {
+            QThread* cpuMonitorThread = new QThread(qApp);
+            cpuMonitorThread->setObjectName("cpuMonitorThread");
+            QObject::connect(cpuMonitorThread, &QThread::started, [this] { setupCpuMonitorThread(); });
+            QObject::connect(qApp, &QCoreApplication::aboutToQuit, cpuMonitorThread, &QThread::quit);
+            cpuMonitorThread->start();
+        }
     });
-
-    vec3 kernelUserAndSystem;
-    getCpuUsage(kernelUserAndSystem);
-    PROFILE_COUNTER(app, "cpuProcess", { { "system", kernelUserAndSystem.x }, { "user", kernelUserAndSystem.y } });
-    PROFILE_COUNTER(app, "cpuSystem", { { "system", kernelUserAndSystem.z } });
 #endif