{"id":147,"date":"2024-10-02T12:00:00","date_gmt":"2024-10-02T12:00:00","guid":{"rendered":"https:\/\/unity3dperformance.com\/?p=147"},"modified":"2024-09-29T18:26:23","modified_gmt":"2024-09-29T18:26:23","slug":"debug-log-performance-optimization","status":"publish","type":"post","link":"https:\/\/unity3dperformance.com\/index.php\/2024\/10\/02\/debug-log-performance-optimization\/","title":{"rendered":"How Debug Log Can Lower Game Performance and How to Avoid It"},"content":{"rendered":"\n

<\/p>\n\n\n\n

Introduction<\/strong><\/h2>\n\n\n\n

When working on a game in Unity, Debug.Log<\/a><\/strong> is a key debugging tool that helps track the code\u2019s operation in real time. However, leaving Debug.Log<\/strong> calls in the final version of the game can significantly affect performance, especially on platforms like mobile devices and WebGL<\/a>. In this post, I will discuss why excessive logging with Debug.Log<\/strong> happens and how to avoid performance issues.<\/p>\n\n\n\n

How Debug Log Works<\/strong><\/h2>\n\n\n\n

Debug.Log is used to display messages in the Unity console while the game is running. While this function is beneficial during development, if we leave these calls in production code, each log statement will consume system resources, particularly processor power.<\/p>\n\n\n\n

<\/p>\n\n\n\n

Why Debug Log Lowers Performance<\/strong><\/h2>\n\n\n\n

Every time Debug.Log<\/strong> is called, several key processes occur:<\/p>\n\n\n\n

    \n
  • Text Formatting<\/strong> \u2013 Unity has to process and format the text, especially when logging dynamic data like variables. This involves additional processor cycles, which can slow down your game.
    <\/li>\n\n\n\n
  • Blocking on the Main Thread<\/strong> \u2013 Debug.Log<\/strong> runs on the main thread, and excessive calls can block its execution. This results in significant drops in frames per second (FPS), ultimately compromising the smoothness of gameplay.<\/li>\n<\/ul>\n\n\n\n

    On devices like mobile<\/strong> and WebGL<\/strong>, excessive calls of this kind can significantly stress the processor and lower the frames per second (FPS).<\/p>\n\n\n\n

    Example: Debug Log in a Loop<\/strong><\/h2>\n\n\n\n

    Below is a screen from the profiler of a game running on the Android operating system<\/strong>, showing how much processor time is consumed by repeatedly calling Debug.Log<\/code> in a loop. As you can see, leaving these logs can lead to a significant drop in performance, especially on mobile platform.<\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    Here\u2019s the code where Debug.Log<\/code> is called 100 times each frame:<\/p>\n\n\n\n

    <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
    using<\/span> <\/span>UnityEngine<\/span>;<\/span><\/span>\n<\/span>\npublic<\/span> <\/span>class<\/span> <\/span>DebugLogTest<\/span> : <\/span>MonoBehaviour<\/span><\/span>\n{<\/span><\/span>\n    <\/span>private<\/span> <\/span>void<\/span> <\/span>Update<\/span>()<\/span><\/span>\n    {<\/span><\/span>\n        <\/span>for<\/span> (<\/span>int<\/span> <\/span>i<\/span> = <\/span>0<\/span>; <\/span>i<\/span> < <\/span>100<\/span>; <\/span>i<\/span>++)<\/span><\/span>\n        {<\/span><\/span>\n            <\/span>Debug<\/span>.<\/span>Log<\/span>(<\/span>$"test"<\/span>);<\/span><\/span>\n        }<\/span><\/span>\n    }<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    How to Avoid This<\/strong><\/h2>\n\n\n\n
    To prevent performance issues caused by excessive logging, we can use the Conditional<\/strong> attribute along with a preprocessor directive to control whether Debug.Log<\/strong> is called only in debug versions, not in production builds.

    We create a Logging<\/code> class with a Log<\/code> method and the attribute [System.Diagnostics.Conditional(\"ENABLE_LOG\")]<\/code>, which means that the method will only be called if we define the preprocessor ENABLE_LOG<\/code>.<\/p>\n\n\n\n
    Here\u2019s an example:<\/p>\n\n\n\n
    <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
    public<\/span> <\/span>static<\/span> <\/span>class<\/span> <\/span>Logging<\/span><\/span>\n{<\/span><\/span>\n    [<\/span>System<\/span>.<\/span>Diagnostics<\/span>.<\/span>Conditional<\/span>(<\/span>"ENABLE_LOG"<\/span>)]<\/span><\/span>\n    <\/span>static<\/span> <\/span>public<\/span> <\/span>void<\/span> <\/span>Log<\/span>(<\/span>object<\/span> <\/span>message<\/span>)<\/span><\/span>\n    {<\/span><\/span>\n        <\/span>UnityEngine<\/span>.<\/span>Debug<\/span>.<\/span>Log<\/span>(<\/span>message<\/span>);<\/span><\/span>\n    }<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
    With this solution, you can disable logging in production builds while keeping it in development or testing versions.

    To use this method, call Logging.Log<\/code> instead of the standard Debug.Log<\/code>:<\/p>\n\n\n\n
    <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
    using<\/span> <\/span>UnityEngine<\/span>;<\/span><\/span>\n<\/span>\npublic<\/span> <\/span>class<\/span> <\/span>DebugLogTest<\/span> : <\/span>MonoBehaviour<\/span><\/span>\n{<\/span><\/span>\n    <\/span>private<\/span> <\/span>void<\/span> <\/span>Update<\/span>()<\/span><\/span>\n    {<\/span><\/span>\n        <\/span>for<\/span> (<\/span>int<\/span> <\/span>i<\/span> = <\/span>0<\/span>; <\/span>i<\/span> < <\/span>100<\/span>; <\/span>i<\/span>++)<\/span><\/span>\n        {<\/span><\/span>\n            <\/span>Logging<\/span>.<\/span>Log<\/span>(<\/span>$"test"<\/span>);<\/span><\/span>\n        }<\/span><\/span>\n    }<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Adding a Custom Preprocessor Directive<\/strong><\/h2>\n\n\n\n

    To enable logging, you need to add the ENABLE_LOG<\/code> preprocessor in Unity\u2019s project settings. You can do this by navigating to Player Settings<\/strong> -> Other Settings<\/strong> and adding ENABLE_LOG<\/code> in the Scripting Define Symbols<\/strong> field.<\/p>\n\n\n\n
    \"\"<\/figure>\n\n\n\n
    <\/p>\n\n\n\n
    Conclusion<\/strong><\/h2>\n\n\n\n
    Debug.Log<\/strong> is a valuable tool during development, but leaving it in production code can lead to performance issues, particularly on mobile and WebGL platforms. Using the Conditional<\/strong> attribute and preprocessor directives allows you to control when logging is active, significantly improving the final game\u2019s performance.<\/p>\n\n\n\n
    I hope this post helps you better manage logging in your Unity projects. If you have any questions or your own ways of optimizing code, feel free to share them in the comments!<\/p>\n\n\n\n
    <\/p>\n","protected":false},"excerpt":{"rendered":"
    Introduction When working on a game in Unity, Debug.Log is a key debugging tool that helps track the code\u2019s operation in real time. However, leaving Debug.Log calls in the final version of the game can significantly affect performance, especially on platforms like mobile devices and WebGL. In this post, I will discuss why excessive logging […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[23,18],"class_list":["post-147","post","type-post","status-publish","format-standard","hentry","category-unity-optimization","tag-code-optimization","tag-unity-optimization"],"yoast_head":"\nHow Debug Log Can Lower Game Performance and How to Avoid It - Unity3D Performance Blog<\/title>\n<meta name=\"description\" content=\"Discover how excessive use of Debug.Log in Unity can affect game performance, especially on mobile and WebGL platforms. 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