Process memory leak while running page

[MiheevN]

On a complex page, like YouTube, process memory is constantly growing as it runs. Sometimes at 5mb per second. If the page is simple, then it doesn't grow.

Used by Veldrid

[MiheevN]

Need independent tests to identify cause

[niclasastrom]

We are noticing the same thing. A "simple" web page updating a clock that shows time (incuding milliseconds) makes the process memory increase. Not fast, but slow. Eventually, the process will run out of memory.

[niclasastrom]

This code example leaks 5.3Gb over 9.5 hours, equal to 9,4Mb per minute. Tested on Windows 11 Pro (10.0.22631), VS 2022 v17.8.3

using System.Diagnostics;
using UltralightNet;
using UltralightNet.AppCore;

var initUsage = Process.GetCurrentProcess().PrivateMemorySize64;
Console.WriteLine("Memory usage after before initializing renderer: " + initUsage / (1024 * 1024));

AppCoreMethods.SetPlatformFontLoader();

var cfg = new ULConfig();
var renderer = ULPlatform.CreateRenderer(cfg);
var view = renderer.CreateView(1980, 1024);
bool loaded = false;

view.OnFinishLoading += (_, _, _) =>
{
loaded = true;
};

view.URL = "https://demo.vindral.com/clock?scale=4";

while (!loaded)
{
renderer.Update();
Thread.Sleep(10);
}

long startMem = -1;
var frameCount = 0;
var startTime = DateTime.Now;

renderer.LogMemoryUsage();

while (!Console.KeyAvailable)
{
frameCount += 1;

renderer.Update();
renderer.Render();
renderer.PurgeMemory();

//Thread.Sleep((int)Math.Round(1000/60f));

if (frameCount %10000 == 0)
{
    var proc = Process.GetCurrentProcess();
    var memUsage = proc.PrivateMemorySize64;

    if (startMem == -1)
        startMem = memUsage;

    if (DateTime.Now > startTime.AddSeconds(1))
    {
        double seconds= (DateTime.Now - startTime).TotalSeconds;
        var uptime = (DateTime.Now - startTime);
        Console.WriteLine("Uptime: "+uptime +"  Frame # " + frameCount + "  MemUsage (MB): " + memUsage/(1024*1024) + "  Diff from start (MB): " + (memUsage - startMem)/(1024*1024) + "  Diff per second avg (KB): " + (((memUsage - startMem) / seconds)/1024).ToString("F0"));
    }
    proc.Dispose();
}

}

renderer.LogMemoryUsage();
renderer.Dispose();
view.Dispose();

System.GC.Collect();

var exitUsage = Process.GetCurrentProcess().PrivateMemorySize64;
Console.WriteLine("Memory usage after disposing renderer: "+exitUsage / (1024 * 1024));