Unity 2020.1 PlayerSettings.WebGL.memorySize Deprecated or Active

stonstad · Aug 21, 2020

I'm building a WebGL player and it looks like PlayerSettings.WebGL.memorySize is not a no-op as documentation claims it to be (https://docs.unity3d.com/ScriptReference/PlayerSettings.WebGL-memorySize.html).

This setting has been deprecated and does not have any effect on WebAssembly builds.
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I was setting it in 2019.x builds, which was required then. In 2020.1 I'm now seeing a runtime error which shows the value is still set:

Cannot enlarge memory arrays. Either (1) compile with -s TOTAL_MEMORY=X with X higher than the current value 2130706432, (2) compile with -s ALLOW_MEMORY_GROWTH=1 which allows increasing the size at runtime, or (3) if you want malloc to return NULL (0) instead of this abort, compile with -s ABORTING_MALLOC=0
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Has anyone else seen this behavior? I'm going to try unsetting it by assigning a memorySize value of 0.

stonstad · Aug 21, 2020

stonstad · Aug 21, 2020

This could be a Chrome limitation. This script shows 2080MB as the max memory size.

public class TestScript : MonoBehaviour
{
private List<byte[]> _Memory = new List<byte[]>();
private long _TotalBytes = 0;
private long _OneMegabyte = 1000000;
private long _TestMax = 8192;
private void Update()
{
if (_TotalBytes < _TestMax * _OneMegabyte)
{
Debug.Log("Allocating 5MB");
_Memory.Add(new byte[_OneMegabyte * 5]);
_TotalBytes += _OneMegabyte * 5;
Debug.Log("Total " + (_TotalBytes / _OneMegabyte) + "MB");
}
}
}
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stonstad · Aug 21, 2020

The Unity heap is a contiguous block of allocated memory. Unity supports automatic resizing for the heap to suit the needs of the application. The heap size expands as an application runs, and can expand up to 2GB. Unity creates this memory heap as a Memory object. The Memory object’s buffer property is a resizable ArrayBuffer that holds the raw bytes of memory accessed by WebAssembly code.
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monark · Sep 3, 2020

Unity now by default dynamically expands the memory as needed but I think there is still a hard limit at 2Gb

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