Idea of capturing mobile terminal variant combination

1） The idea of grabbing the variant combination of mobile phones
​2） How to clear File.ReadAllBytes Resulting memory leak
3）atlas.GetSprite(name) Memory leak
4）Unity After version update Odin Plug in serialization error

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This is the first 303 piece UWA Push of technical knowledge sharing . Today we continue to select and develop a number of 、 Optimization related issues , Suggested reading time 10 minute , If you read it carefully, you will get something .

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Shader

Q： Questions about variant collection ,PC The end editor comes with its own collection , But after all, the running time is Editor Environmental Science , It is far from the real mobile environment .Warmup Only the combinations in the list will be preloaded , Not Shader All combinations of packages . So if the collected variant is not a real environment , It will only be wasted CPU And GPU memory , When the real rendering is performed, it is found that the combination submitted before is required by the non mobile end , Need to re Warmup.

also , If the quality is divided , For example, fine pictures turn on dynamic shadows , Smooth model off . This produces two sets of combinations . Theoretically, it should be divided into two SVC, and PC Yes, you can only save a list of all variants .

Sum up , I think the solution is to run the mobile phone in real time , Capture the usage data of the mobile phone , To divide into different lists , This should be the most authentic .

In order to realize this idea , You need to be able to find out how to get the submitted variant data , Known to be available in profiler-CPU-Timeline Mode of Shader.CreateGPUProgram Inside meta_data You can get it in there .

adopt CS Source code analysis to NativeProfilerTimeline This control is drawing Timeline The core of the class .NativeProfilerTimeline.GetEntryInstanceInfo This function can get the corresponding meta_data.

But this class is C++ It's written at the bottom ,C# It's just Draw To submit the drawing .GetEntryAtPosition Go to the mouse position to get Entry, Code cannot be reflected to EntryIndex. Now we are in a dead end .

Do you have any solutions or new ideas ？ It's best to get a list of variations on your phone .

A： Can be in Graphics Check this on the panel Log Shader Compilation：

Under the editor Console Connect the real machine , So you can trigger Shader.CreateGPUProgram See the corresponding Log：
Autoconnected Player Compiled shader: Unlit/TestShader, pass: , stage: all, keywords FOG_EXP2

Thank you Zong Huixuan @UWA The Q & a community provides answers

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Memory

Q： Recently, the project has been playing for a long time , Memory keeps exploding . During the inspection , I found that one was used in the game File.ReadAllBytes Method to read several 5～10MB Unequal binary data , After loading, the data has been copied null, however Mono Still growing , call GC Can not be released .

Theoretically, this array has not been referenced by the business layer . however , use Memory Profiler see , The memory is still . Please consult , Does anyone know how to clear it ？

Unity edition 2019.4.9

 

A1： Buffers don't have to... Every time new One .

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A2： If it is Mono Version of APK, You can try IL2CPP. If IL2CPP The version does not have this problem , Should be to encounter Mono Of Bug 了 , Allocate more heap memory at one time , There is a probability that the allocated heap memory cannot be reclaimed .

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A3：Boehm GC Caused by its own defects , You can search for BlackList, If there is source code , There are many ways to avoid or minor modifications ; If there is no source code, you can try ：
1. Reduce... In the dictionary Struct When Key;
2. Remove small files , rewrite File The interface of , Reuse memory .

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Script

Q：Unity edition 2019.4.23, Found in frequent calls atlas.GetSprite(name) Memory leaks when , Increase or decrease , Until it collapses ！ Has anyone ever encountered this problem ？ Is there any good solution ？

A1： If you don't consider the engine itself Bug Under the circumstances , Most memory leaks are caused by references that are not handled properly . Some places may still use these resources , It's just not relevant , As a result, this part of resources cannot be recycled . Therefore, you can focus on checking these functions first .

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A2：
//
// Abstract :
// Clone the first Sprite in this atlas that matches the name packed in this atlas
// and return it.
//
// Parameters :
// name:
// The name of the Sprite.
public Sprite GetSprite(string name);

According to this passage Clone, That is to say, every call GetSprite, Will perform a clone operation , And will not automatically release .

Then you need to use the management script to create a buffer pool , Repetitive Sprite Get it directly from the pool . And release from the script when releasing .

Dictionary<string, Sprite> mSpritePool = new Dictionary<string, Sprite>(); public Sprite GetSprite(string key, SpriteAtlas source) { Sprite result = null; if(!mSpritePool.TryGetValue(key, out result)) { result = source.GetSprite(key); if (result != null) { mSpritePool.Add(key, result); } } return result; } 

You can also do SpriteAtlas Storage of key value pairs of objects , Easy access and release .

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Script

Q：Unity After version update Odin serialize , After version update , from 2020.3.21 Update to 2021.3.41 This problem occurred after .

 

A：Odin The warehouse has a similar problem , stay 3.0.13.0 Version fixed , Try upgrading the plug-in version ：
https://bitbucket.org/sirenix/odin-inspector/issues/843/error-with-serializedmonobehaviour-on

 

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