Turning this on attaches names to the draw calls being made by the engine so that we have context when looking at the capture later in Frame Analyzer.įinally, we capture a frame with the keyboard shortcut CTRL+SHIFT+C. To do this, type ToggleDrawEvents into the game console.įigure 7: ToggleDrawEvents console command. To get a frame to analyze in Frame Analyzer, two additional steps are needed in-game.įirst is to turn on Toggle Draw Events. To expand the display, press CRTL+F1 once for real-time metrics information, and again to get a list of keyboard shortcuts of experiments available to be applied as the game is running.įigure 6: The Intel® GPA overlay in game. The game will open normally, but now a statistics guide is visible in the top-left corner of the screen. With the build complete, go into Analyze Application of the Graphics Monitor and select the executable location in the command line and run it. Once installed, build the Unreal project with the Development Build Configuration selected.
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To get started, download GPA from the Intel® Developer Zone. Intel® Graphics Performance Analyzers (Intel® GPA) is a suite of graphics analysis and optimization tools that help developers get more performance out of their graphics applications.įor this guide, we will focus on two aspects of the suite: the real-time Analyze Application, and Frame Analyzer. Intel® Graphics Performance Analyzers (Intel® GPA) It shows the time of each rendering pass within the snapshot and a rough idea of where in the scene those passes took place.įigure 5: Viewing processes within the GPU Visualization.Īs with the Profiler, identifying the items that take the most processing time will give clues about where to start optimization efforts.įor an in-depth explanation of the GPU Visualizer, see the Epic documentation. Once the command is entered, the GPU Visualizer window pops open. The GPU Visualizer can be accessed from the in-game developer console by entering ProfileGPU.
The UE4 GPU Visualizer identifies the cost of rendering passes and provides a high-level view of what is happening within a scene snapshot. Each area can be examined to see how it affects the frame rate within the project.įor an in-depth explanation of the Profiler, see the Epic documentation. Select the Data Capture option to begin capturing data from the game, and then deselect it to save that data for later viewing.įigure 3: Viewing processes within the Profiler.įrom the Profiler, the time of every action and call is reflected in ms. Now that we are in the Profiler window, select Play-In-Editor (PIE), then select Data Preview and Live Preview to see the data being collected from the game. In Session Frontend, select the Profiler tab.įigure 2: The Profiler in the Unreal Engine. The UE4 CPU Profiler tool is an in-engine monitor that allows you to see the performance of the game, either live or from a captured section.įind the Profiler under Window > Developer Tools > Session Frontend.įigure 1: Finding the Session Frontend window. To get started, let’s look at three tools for understanding what is happening under the hood of the engine: UE4 CPU Profiler, UE4 GPU Visualizer, and the Intel® Graphics Performance Analyzers (Intel® GPA). 10 fps to 30 fps is an improvement of 66.67 ms.100 fps to 120 fps is an improvement of 1.66 ms.Using milliseconds to describe improvements in performance helps better quantify level of optimization needed to hit the fps target.įor instance, with an improvement of 20 fps to a scene: To find the ms of any fps, simply get the reciprocal of that fps and multiply by 1000.
This chart illustrates the mapping between average fps and ms. Unitsįor measuring improvements made with optimizations, frames per second (fps) and duration in milliseconds per frame (ms) are considered.
Version 4.14 was used in the making of this guide. The goal of this tutorial is to identify where performance issues occur and provide several methods to tackle them. In this tutorial, we go over a collection of tools to use within and outside of the engine, as well some best practices for the editor, and scripting to help increase the frame rate and stability of a project. This is a tutorial to help developers improve the performance of their games in Unreal Engine* 4 (UE4). The contents of this guide work for version 4.19 of the Unreal Engine.
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