『FINAL FANTASY VII REMAKE』におけるプロファイリングと最適化事例【UNREAL FEST EXTREME 2021 SUMMER】

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Thread 優先度アフィニティマスク GameThread TPri_Normal MAKEAFFINITYMASK1(0) RenderingThread TPri_Normal MAKEAFFINITYMASK1(1) RHIThread TPri_Normal MAKEAFFINITYMASK1(2) TaskGraphThread TPri_SlightlyBelowNormal MAKEAFFINITYMASK7(0, 1, 2, 3, 4, 5, 6) PoolThread TPri_Lowest MAKEAFFINITYMASK4(3, 4, 5, 6) AsyncLoadingThread TPri_BelowNormal MAKEAFFINITYMASK5(2, 3, 4, 5, 6) © 2021 SQUARE ENIX CO., LTD. All Rights Reserved.

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[beta]

void UParticleSystemComponent::TickComponent(float DeltaTime, enum ELevelTick TickType, FActorComponentTickFunction *ThisTickFunction)
{
// 省略...
AsyncWork = TGraphTask<FParticleAsyncTask>::CreateTask(nullptr, ENamedThreads::GameThread).ConstructAndDispatchWhenReady(this);
ThisTickFunction->GetCompletionHandle()->DontCompleteUntil(AsyncWork);
// 省略...
}
class FParticleAsyncTask
{
// 省略...
void DoTask(ENamedThreads::Type CurrentThread, const FGraphEventRef& MyCompletionGraphEvent)
{
FGraphEventRef Finalize = TGraphTask<FParticleFinalizeTask>::CreateTask(nullptr, CurrentThread).ConstructAndDispatchWhenReady(Target);
MyCompletionGraphEvent->DontCompleteUntil(Finalize);
}

// 省略...
};

© 2021 SQUARE ENIX CO., LTD. All Rights Reserved.

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UParticleSystemComponent::UParticleSystemComponent(const FObjectInitializer& ObjectInitializer) : Super(ObjectInitializer) { // 省略... AsyncTickFunction.Target = [this](float DeltaTime) { ComputeTickComponent_Concurrent(); }; FinalizeTickFunction.Target = [this](float DeltaTime) { FinalizeTickComponent(); }; // 省略... } © 2021 SQUARE ENIX CO., LTD. All Rights Reserved.

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void UParticleSystemComponent::RegisterComponentTickFunctions(bool bRegister) { // 省略... if (bRegister) { if (SetupActorComponentTickFunction(&AsyncTickFunction)) { AsyncTickFunction.AddPrerequisite(this, PrimaryComponentTick); } if (SetupActorComponentTickFunction(&FinalizeTickFunction)) { FinalizeTickFunction.AddPrerequisite(this, AsyncTickFunction); } } else { if (AsyncTickFunction.IsTickFunctionRegistered()) { AsyncTickFunction.UnRegisterTickFunction(); } if (FinalizeTickFunction.IsTickFunctionRegistered()) { FinalizeTickFunction.UnRegisterTickFunction(); } } // 省略... } © 2021 SQUARE ENIX CO., LTD. All Rights Reserved.

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StartFrame TickGroup Tick GameThread Tick Async Finalize Finalize TaskGraphThread Async すべての TickGroup前にタスクの依存関係の構築をするようになる NullTaskがなくなり直接 TickGroupの終わりへ © 2021 SQUARE ENIX CO., LTD. All Rights Reserved. TickGroup の終わり

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[beta]

int32 FEngineLoop::PreInit( const TCHAR* CmdLine )
{
// 省略...

UObject* StartupPackages = LoadPackage(NULL, TEXT("/Game/ResidentAsset"), LOAD_None);
if (GUObjectArray.IsOpenForDisregardForGC())
{
GUObjectArray.CloseDisregardForGC();
}
// 省略...

}
© 2021 SQUARE ENIX CO., LTD. All Rights Reserved.

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// クラスタを作る virtual bool UHoge::CanBeClusterRoot() const override { return true; } // クラスタへ入れないようにする virtual bool UHoge::CanBeInCluster() const override { return false; } [/Script/Engine.GarbageCollectionSettings] gc.ActorClusteringEnabled=True © 2021 SQUARE ENIX CO., LTD. All Rights Reserved.

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-9.76 ms 100 90 93.83 -9.45 ms 84.07 -11.57 ms 80 67.48 70 60 ミリ秒 58.03 55.28 50 43.71 40 30 20 10 0 A地点 B地点 Disregard for GC のみ GC Cluster + Disregard for GC © 2021 SQUARE ENIX CO., LTD. All Rights Reserved. C地点

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70 60.48 59.35 59.15 60 50 40 ミリ秒 30 37.62 24.05 20 10.66 10.63 12.9 10.8 10 0 未対応 Disregard for GC のみ PerformReachabilityAnalysis UnhashUnreachable © 2021 SQUARE ENIX CO., LTD. All Rights Reserved. GC Cluster + Disregard for GC その他

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適用前適用後 © 1997, 2020 SQUARE ENIX CO., LTD. All Rights Reserved. CHARACTER DESIGN:TETSUYA NOMURA/ROBERTO FERRARI Frame Rate Game Draw -2.42 FPS -2.09 ms -1.53 ms 適用後は大幅な改善！！ © 2021 SQUARE ENIX CO., LTD. All Rights Reserved.

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-8.121 ms 80 70 70.564 60 62.443 50 ミリ 40 秒 -3.1348 ms -2.501 ms 30 20 -1.128 ms 22.1468 19.012 20.668 18.167 10 6.586 0 Game Thread Render Thread 適用なし 5.458 RHI Thread PGO+LTO © 2021 SQUARE ENIX CO., LTD. All Rights Reserved. All TaskGraphThreads

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GameThread AsyncLoadingThread Frame 1 Frame 2 Frame 3 Frame 4 Frame 5 FEngineLoop Tick FEngineLoop Tick FEngineLoop Tick FEngineLoop Tick FEngineLoop Tick Loading 処理 Loading 処理 © 2021 SQUARE ENIX CO., LTD. All Rights Reserved. Loading 処理 Loading 処理

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Skeletal Mesh Component Tick からタスクを積まれ、 Evaluate Animation 完了後に実行される Game Thread で実行される Complate Animation （Component Transform 更新、Physics Scene 更新、Notify 呼び出し） © 2021 SQUARE ENIX CO., LTD. All Rights Reserved.

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[beta]

実装イメージ
UCLASS()
class UMyClass : public UObject
{
GENERATED_BODY()

UCLASS()
class UMyClass : public UObject
{
GENERATED_BODY()

UPROPERTY()
TArray< FMyStruct > MyDataList;

UPROPERTY()
TMap< int32, FMyStruct > MyDataMap;

TMap< int32, FMyStruct > MyDataMap;
virtual void Serialize(FArchive& Ar) override;

};

};
© 2021 SQUARE ENIX CO., LTD. All Rights Reserved.

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[beta]

void UMyClass::Serialize(FArchive& Ar)
{
Super::Serialize(Ar);
// MyDataListはデシリアライズされたTArray
if (MyDataList.Num() > 0)
{
if (MyDataMap.Num() == 0)
{
MyDataMap.Reserve(MyDataList.Num());
for (auto& Elem : MyDataList)
{
// TMapへコピー
MyDataMap.Add(Elem.Id, Elem);
}
}
}

}

© 2021 SQUARE ENIX CO., LTD. All Rights Reserved.

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[beta]

struct MyDataTableRow
{
int32 HitPoint;
int32 MagicPoint;
bool GameFlag;
TArray<int32> SomeDataList;
void SaveOrLoad(FArchive &Ar);
};

void
{

MyDataTableRow::SaveOrLoad(FArchive &Ar)
//
Ar
Ar
Ar
Ar

保存と読み出し
<< HitPoint;
<< MagicPoint;
<< GameFlag;
<< SomeDataList;

}
© 2021 SQUARE ENIX CO., LTD. All Rights Reserved.

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[beta]

UCLASS()
class UMyDataTable : public UObject
{
GENERATED_BODY()
// 行データ
TMap<FName, FMyDataTableRow> RowDataMap;
virtual void Serialize(FArchive& Ar) override;
};

void UMyDataTable::Serialize(FArchive& Ar)
{
Super::Serialize(Ar);
if (Ar.IsSaving())
{
// 保存
int32 RowNums = RowDataMap.Num();
Ar << RowNums;
for (auto& Elem : RowDataMap)
{
FName RowName;
Ar << Elem.Key;
Elem.Value.SaveOrLoad(Ar);
}
}
else
//… 省略
}
© 2021 SQUARE ENIX CO., LTD. All Rights Reserved.

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