GPGMM

GPGMM is a General-Purpose GPU Memory Management C++ library used by GPU application run-times or middleware APIs that rely on low-level graphics and compute APIs (D3D12 or Vulkan) for "explicit" memory management. GPGMM is a fast, multi-threaded Video Memory Manager (VidMM) implementation that replaces what older APIs accomplished through the GPU driver (D3D11 or OpenGL).

Build and Run

Install depot_tools

GPGMM uses the Chromium build system and dependency management so you need to install depot_tools and add it to the PATH.

Notes:

• On Windows, you'll need to set the environment variable DEPOT_TOOLS_WIN_TOOLCHAIN=0. This tells depot_tools to use your locally installed version of Visual Studio (by default, depot_tools will try to download a Google-internal version).

Get the code

Get the source code as follows:

# Clone the repo as "GPGMM"
> git clone https://github.com/intel/GPGMM.git GPGMM && cd GPGMM

# Bootstrap the gclient configuration
> cp scripts/standalone.gclient .gclient

# Fetch external dependencies and toolchains with gclient
> gclient sync

Setting up the build

Generate build files using gn args out/Debug or gn args out/Release.

A text editor will appear asking build arguments, the most common argument is is_debug=true/false; otherwise gn args out/Release --list shows all the possible options.

To build with a backend, please set the corresponding argument from following table.

Backend	Build argument
DirectX 12	gpgmm_enable_d3d12=true (default on winos)
Vulkan	gpgmm_enable_vulkan=true

Build

Then use ninja -C out/Release or ninja -C out/Debug to build.

Run tests

Run unit tests:

> out/Debug/gpgmm_unittests

Run end2end tests:

> out/Debug/gpgmm_end2end_tests

Run capture replay tests:

> out/Debug/gpgmm_capture_replay_tests

How do I use it?

To allocate, you create an allocator then create allocations from it:

D3D12_FEATURE_DATA_ARCHITECTURE arch = {};
device->CheckFeatureSupport(D3D12_FEATURE_ARCHITECTURE, &arch, sizeof(arch)

D3D12_FEATURE_DATA_D3D12_OPTIONS options = {};
device->CheckFeatureSupport(D3D12_FEATURE_D3D12_OPTIONS, &options, sizeof(options)));

gpgmm::d3d12::ALLOCATOR_DESC allocatorDesc = {};
allocatorDesc.Adapter = adapter;
allocatorDesc.Device = device;
allocatorDesc.IsUMA =  arch.UMA;
allocatorDesc.ResourceHeapTier = options.ResourceHeapTier;

ComPtr<gpgmm::d3d12::ResourceAllocator> allocator;
gpgmm::d3d12::ResourceAllocator::CreateAllocator(desc, &allocator);

/* Fill this out */
D3D12_RESOURCE_DESC& resourceDesc = {...};
D3D12_RESOURCE_STATES initialState = {...}

gpgmm::d3d12::ALLOCATION_DESC allocationDesc = {};
allocationDesc.HeapType = heapType;

ComPtr<gpgmm::d3d12::ResourceAllocation> allocation;
allocator->CreateResource(allocationDesc, resourceDesc, initialState, /*pOptimizedClear*/nullptr, &allocation);

Then de-allocate:

/* Must make sure GPU is finished using it */
allocation.Release();

To use basic residency:

1. Create a d3d12::ResourceAllocator with ALLOCATOR_FLAG_ALWAYS_IN_BUDGET flag.
2. Use d3d12::ResourceAllocator::CreateResource for every resource you want residency managed.
3. Create a d3d12::ResidencySet to track a collection of allocations that should be resident for a given command-list (1:1 relationship).
4. d3d12::ResourceAllocation::UpdateResidency tracks the underlying heap for the resident set.
5. Use d3d12::ResidencyManager::ExecuteCommandLists with the residency set, queue, and command list.

What about residency for other heaps (SV descriptor or query heaps)?

1. Sub-class d3d12::Heap.
2. Call d3d12::ResidencyManager::InsertHeap on it after creation.
3. Use d3d12::ResidencyManager::Lock or d3d12::ResidencyManager::UnlockHeap to keep heap resident or not, respectively.

Project/build integration

GPGMM has built-in GN or CMake build targets.

GN

BUILD.gn

source_set("proj") {
  deps = [ "${gpgmm_dir}:gpgmm" ]
}

Create build_overrides/gpgmm.gni file in root directory.

CMake

CMakeLists.txt

add_subdirectory(gpgmm)
target_include_directories(proj PRIVATE gpgmm/src/include gpgmm/src)
target_link_libraries(proj PRIVATE gpgmm ...)

Visual Studio (MSVC)

Dynamic Linked Library (DLL)

Use is_clang=false gpgmm_shared_library=true when Setting up the build. Then use ninja -C out/Release gpgmm or ninja -C out/Debug gpgmm to build the shared library (DLL).

Copy the DLL into the $(OutputPath) folder and configure the VS build:

1. Highlight project in the Solution Explorer, and then select Project > Properties.
2. Under Configuration Properties > C/C++ > General, add gpgmm\src and gpgmm\src\include to Additional Include Directories.
3. Under Configuration Properties > Linker > Input, add gpgmm.dll.lib to Additional Dependencies.
4. Under Configuration Properties > Linker > General, add the folder path to out\Release to Additional Library Directories.

Then import:

#include <gpgmm_d3d12.h> // or gpgmm_vulkan.h

Prerequisites

• Error handing uses API error codes (HRESULT and VkResult for D3D12 and Vulkan, respectively).

License

Apache 2.0 Public License, please see LICENSE.