GPU Memory Tracking

Overview #

In version 1.40, Prysm introduces GPU memory tracking. This comes with the ability to extract detailed information about the allocated GPU memory in the Library and the ability to reset the GPU memory peaks. That makes it easier to check the memory statistics of the allocated resources.

NOTE This API is only available in a Developer configuration.

This page provides details about the feature, a list of everything we track, a sample of how to obtain the information, as well as a few general considerations for extracting the information.

How to extract GPU memory information #

We have developed a structure to hold the GPU memory data called GPUMemoryInfo, which can be filled with all the tracked information using the help of the GetGPUMemoryStats() method found in the Library. As for user textures, which are tracked separately from the rest of the GPU memory, the cohtml::UserGPUMemoryInfo* Library::GetUserGPUMemoryStats() method can be used to retrieve their information, which is encapsulated in a different structure called UserGPUMemoryInfo. The GPUMemoryInfo::Release() method must be called on the returned cohtml::GPUMemoryInfo* or cohtml::UserGPUMemoryInfo* pointer to free its allocated memory. The statistics from the Library include all shared resources across the Views. A list of every member in the GPUMemoryInfo and UserGPUMemoryInfo structures along with a description of what each member tracks is provided below.

How to reset GPU memory peaks #

In order to reset the accumulated memory peaks to match the current state, the ResetGPUMemoryTrackerPeaks() method of the Library needs to be invoked. Resetting the peaks of the Library will also reset the user textures' peaks.

A list of all the monitored GPU memory data #

GPUMemoryInfo structure #

In-depth description of TexturesInformation’s members #

In-depth description of BuffersInformation’s members #

In-depth description of ExtraColorImageTexturesInformation’s members #

UserGPUMemoryInfo structure #

In-depth description of the UserTexturesInfo’s members #

In-depth description of the RenderTargetInfo’s members #

In-depth description of the ExtraUserImageInfo’s members #

Resource domains #

namespace domains
{
	enum TextureType
	{
		TT_ColorTexture = 0,
		TT_DepthTexture,
		TT_Count
	};

	enum BufferType
	{
		BT_IndexBuffer = 0,
		BT_VertexBuffer,
		BT_ConstantBuffer,
		BT_Count
	};

	enum TextureDomain
	{
		T_ScratchTexture = 0,
		T_LayerTexture,
		T_ImageTexture,
		T_SurfaceTexture,
		T_CompositorTexture,
		T_GlyphAtlas,
		T_GradientCacheTexture,
		T_Count
	};

	enum VBDomain                           // Vertex Buffer Domain
	{
		VB_GeometryBuffer = 0,
		VB_PathBuffer,
		VB_GlyphBuffer,
		VB_Count
	};

	enum IBDomain                           // Index Buffer Domain
	{
		IB_GeometryBuffer = 0,
		IB_PathBuffer,
		IB_GlyphBuffer,
		IB_Count
	};

	enum CBDomain                           // Constant Buffer Domain (same as CBType)
	{
		// Vertex shader CBs
		CB_DataVS,

		// Pixel shader CBs
		CB_DataPS,

		CB_Count
	};
}

Example GPU memory information extraction and display #

Below are example functions that show how to display GPU memory information.

void PrintToLog(const cohtml::GPUMemoryInfo* memoryStats)
{
	std::ostringstream oss;
	oss << "---------- Total GPU Memory Stats ----------" << std::endl;
	oss << "\tTotal GPU Memory: " << memoryStats->TotalBytes << " bytes" << std::endl;
	oss << "\tPeak GPU Memory: " << memoryStats->PeakBytes << " bytes" << std::endl;

	oss << "\t> Main textures memory info:" << std::endl;
	oss << "\tTotal color textures memory: " << memoryStats->TexturesInformation[renoir::domains::TT_ColorTexture].Total.Bytes << " bytes" << std::endl;
	oss << "\tTotal depth textures memory: " << memoryStats->TexturesInformation[renoir::domains::TT_DepthTexture].Total.Bytes << " bytes" << std::endl;
	oss << "\tPeak color textures memory: " << memoryStats->TexturesInformation[renoir::domains::TT_ColorTexture].Peak.Bytes << " bytes" << std::endl;
	oss << "\tPeak depth textures memory: " << memoryStats->TexturesInformation[renoir::domains::TT_DepthTexture].Peak.Bytes << " bytes" << std::endl;

	oss << "\t> Main buffers memory info:" << std::endl;
	oss << "\tTotal Index Buffers memory: " << memoryStats->BuffersInformation[renoir::domains::BT_IndexBuffer].Total.Bytes << " bytes" << std::endl;
	oss << "\tTotal Vertex Buffers memory: " << memoryStats->BuffersInformation[renoir::domains::BT_VertexBuffer].Total.Bytes << " bytes" << std::endl;
	oss << "\tTotal Constant Buffers memory: " << memoryStats->BuffersInformation[renoir::domains::BT_ConstantBuffer].Total.Bytes << " bytes" << std::endl;
	oss << "\tPeak Index Buffers memory: " << memoryStats->BuffersInformation[renoir::domains::BT_IndexBuffer].Peak.Bytes << " bytes" << std::endl;
	oss << "\tPeak Vertex Buffers memory: " << memoryStats->BuffersInformation[renoir::domains::BT_VertexBuffer].Peak.Bytes << " bytes" << std::endl;
	oss << "\tPeak Constant Buffers memory: " << memoryStats->BuffersInformation[renoir::domains::BT_ConstantBuffer].Peak.Bytes << " bytes" << std::endl;

	oss << "\t> Textures count info:" << std::endl;
	oss << "\tTotal count of color textures: " << memoryStats->TexturesInformation[renoir::domains::TT_ColorTexture].Total.Count << std::endl;
	oss << "\tTotal count of depth textures: " << memoryStats->TexturesInformation[renoir::domains::TT_DepthTexture].Total.Count << std::endl;
	oss << "\tPeak count of color textures: " << memoryStats->TexturesInformation[renoir::domains::TT_ColorTexture].Peak.Count << std::endl;
	oss << "\tPeak count of depth textures: " << memoryStats->TexturesInformation[renoir::domains::TT_DepthTexture].Peak.Count << std::endl;

	oss << "\t> Buffers count info:" << std::endl;
	oss << "\tTotal count of Index Buffers: " << memoryStats->BuffersInformation[renoir::domains::BT_IndexBuffer].Total.Count << std::endl;
	oss << "\tTotal count of Vertex Buffers: " << memoryStats->BuffersInformation[renoir::domains::BT_VertexBuffer].Total.Count << std::endl;
	oss << "\tTotal count of Constant Buffers: " << memoryStats->BuffersInformation[renoir::domains::BT_ConstantBuffer].Total.Count << std::endl;
	oss << "\tPeak count of Index Buffers: " << memoryStats->BuffersInformation[renoir::domains::BT_IndexBuffer].Peak.Count << std::endl;
	oss << "\tPeak count of Vertex Buffers: " << memoryStats->BuffersInformation[renoir::domains::BT_VertexBuffer].Peak.Count << std::endl;
	oss << "\tPeak count of Constant Buffers: " << memoryStats->BuffersInformation[renoir::domains::BT_ConstantBuffer].Peak.Count << std::endl;

	const char* textureTypeStrings[] = { "Color", "Depth" };
	const char* textureStrings[] = { "Scratch Texture", "Layer Texture", "Image Texture", "Surface Texture", "Compositor Texture", "Glyph Atlase", "Gradient Cache Texture" };
	const char* bufferStrings[] = { "Index Geometry Buffer", "Index Path Buffer", "Index Glyph Buffer",
									"Vertex Geometry Buffer", "Vertex Path Buffer", "Vertex Path Instance Data Buffer", "Vertex Glyph Buffer",
									"VS Data Constant Buffer", "PS Data Constant Buffer" };

	APP_LOG(Info, oss.str().c_str());
	oss.str("");

	for (size_t texType = 0; texType < renoir::domains::TextureType::TT_Count; ++texType)
	{
		for (size_t texDomain = 0; texDomain < renoir::domains::TextureDomain::T_Count; ++texDomain)
		{
			oss << "\t> " << textureTypeStrings[texType] << " " << textureStrings[texDomain] << "s:" << std::endl;

			auto& domainInfo = memoryStats->TexturesInformation[texType].ResourceArray[texDomain];

			oss << "\tTotal memory: " << domainInfo.Total.Bytes << " bytes" << std::endl;
			oss << "\tTotal count: " << domainInfo.Total.Count << std::endl;
			oss << "\tPeak memory: " << domainInfo.Peak.Bytes << " bytes" << std::endl;
			oss << "\tPeak count: " << domainInfo.Peak.Count << std::endl;

			for (size_t i = 0; i < domainInfo.ArraySize; i++)
			{
				oss << "\tID: " << domainInfo.Array[i].Id << "; Owner: ";
				if (domainInfo.Array[i].OwnerId == RENOIR_INVALID)
				{
					oss << "Shared";
				}
				else
				{
					oss << domainInfo.Array[i].OwnerId;
				}
				oss << "; Size: " << domainInfo.Array[i].Bytes << " bytes";
				if (texType == renoir::domains::TextureType::TT_ColorTexture &&
					texDomain == renoir::domains::TextureDomain::T_ImageTexture &&
					memoryStats->ExtraColorImageTexturesInformation.Array[i].Name)
				{
					oss << "; View client IDs:";
					for (size_t viewCount = 0; viewCount < memoryStats->ExtraColorImageTexturesInformation.Array[i].ViewClientsCount; ++viewCount)
					{
						oss << " " << memoryStats->ExtraColorImageTexturesInformation.Array[i].ViewClients[viewCount];
					}
					oss << std::endl << "\t\tTexture Name: " << memoryStats->ExtraColorImageTexturesInformation.Array[i].Name << std::endl;
				}
				else
				{
					oss << std::endl;
				}
			}

			APP_LOG(Info, oss.str().c_str());
			oss.str("");
		}

	}

	for (size_t buffType = 0; buffType < renoir::domains::BufferType::BT_Count; ++buffType)
	{
		size_t buffDomainSize = buffType == renoir::domains::BufferType::BT_IndexBuffer ? renoir::domains::IB_Count :
			buffType == renoir::domains::BufferType::BT_VertexBuffer ? renoir::domains::VB_Count : renoir::CB_Count;

		size_t buffStringsStart = buffType == renoir::domains::BufferType::BT_IndexBuffer ? 0 :
			buffType == renoir::domains::BufferType::BT_VertexBuffer ? renoir::domains::IB_Count : renoir::domains::IB_Count + renoir::domains::VB_Count;

		for (size_t buffDomain = 0; buffDomain < buffDomainSize; buffDomain++)
		{
			oss << "\t> " << bufferStrings[buffStringsStart + buffDomain] << "s:" << std::endl;
			auto& domainInfo = memoryStats->BuffersInformation[buffType].ResourceArray[buffDomain];

			oss << "\tTotal memory: " << domainInfo.Total.Bytes << " bytes" << std::endl;
			oss << "\tTotal count: " << domainInfo.Total.Count << std::endl;
			oss << "\tPeak memory: " << domainInfo.Peak.Bytes << " bytes" << std::endl;
			oss << "\tPeak count: " << domainInfo.Peak.Count << std::endl;

			for (size_t i = 0; i < domainInfo.ArraySize; i++)
			{
				oss << "\tID: " << domainInfo.Array[i].Id << "; Owner: ";
				if (domainInfo.Array[i].OwnerId == RENOIR_INVALID)
				{
					oss << "Shared";
				}
				else
				{
					oss << domainInfo.Array[i].OwnerId;
				}
				oss << "; Size: " << domainInfo.Array[i].Bytes << " bytes";
				oss << "; Peak usage: " << domainInfo.Array[i].PeakUsageBytes << " bytes" << std::endl;
			}

			APP_LOG(Info, oss.str().c_str());
			oss.str("");
		}
	}
}

void PrintToLog(const cohtml::UserGPUMemoryInfo* memoryStats)
{
	TmpOSStream oss;
	oss << "\t---------- User GPU Memory Stats ----------" << std::endl;
	oss << "\tTotal GPU Memory: " << memoryStats->Total.Bytes << " bytes" << std::endl;
	oss << "\tPeak GPU Memory: " << memoryStats->Peak.Bytes << " bytes" << std::endl;
	oss << "\tTotal texture count: " << memoryStats->Total.Count << std::endl;
	oss << "\tPeak texture count: " << memoryStats->Peak.Count << std::endl;

	if (memoryStats->ArraySize > 0)
	{
		oss << "\t---------- Textures ----------" << std::endl;
	}

	for (size_t i = 0; i < memoryStats->ArraySize; i++)
	{
		const auto& texture = memoryStats->Array[i];
		oss << "\tID: " << texture.Id << ";\tSize: " << texture.Bytes << " bytes" << std::endl;
		oss << "\tName: " << texture.Name << std::endl;
		oss << "\tView Clients Count: " << texture.ViewClientsCount << std::endl;
		for (size_t viewCount = 0; viewCount < texture.ViewClientsCount; ++viewCount)
		{
			oss << "\tView Client Id: " << texture.ViewClients[viewCount] << std::endl;
		}
	}

	APP_LOG(Info, oss.str().c_str());
}

We have already implemented them and they can be used like this

void PrintGPUMemoryStats()
{
	auto combinedMemoryStats = m_CohtmlApp->GetLibrary()->GetGPUMemoryStats();
	if (combinedMemoryStats)
	{
		combinedMemoryStats->PrintToLog();
		combinedMemoryStats->Release();
	}
}

void PrintUserGPUMemoryStats()
{
	auto userMemoryStats = m_CohtmlApp->GetLibrary()->GetUserGPUMemoryStats();
	if (userMemoryStats)
	{
		userMemoryStats->PrintToLog();
		userMemoryStats->Release();
	}
}