CUDA Samples

Samples for CUDA Developers which demonstrates features in CUDA Toolkit. This version supports CUDA Toolkit 11.1.

Release Notes

This section describes the release notes for the CUDA Samples on GitHub only.

CUDA 11.1

• Added watershedSegmentationNPP. Demonstrates how to use the NPP watershed segmentation function.
• Added batchedLabelMarkersAndLabelCompressionNPP. Demonstrates how to use the NPP label markers generation and label compression functions based on a Union Find (UF) algorithm including both single image and batched image versions.
• Dropped Visual Studio 2012, 2013 support from all the windows supported samples.
• Added kernel performing warp aggregated atomic max in multi buckets using cg::labeled_partition & cg::reduce in warpAggregatedAtomicsCG.
• Added extended CG shuffle mechanics to shfl_scan sample.
• Added cudaOpenMP. Demonstrates how to use OpenMP API to write an application for multiple GPUs.
• Added simpleZeroCopy. Demonstrates how to use zero copy, kernels can read and write directly to pinned system memory.

CUDA 11.0

• Added dmmaTensorCoreGemm. Demonstrates double precision GEMM computation using the Double precision Warp Matrix Multiply and Accumulate (WMMA) API introduced with CUDA 11 in Ampere chip family tensor cores.
• Added bf16TensorCoreGemm. Demonstrates __nv_bfloat16 (e8m7) GEMM computation using the __nv_bfloat16 WMMA API introduced with CUDA 11 in Ampere chip family tensor cores.
• Added tf32TensorCoreGemm. Demonstrates tf32 (e8m10) GEMM computation using the tf32 WMMA API introduced with CUDA 11 in Ampere chip family tensor cores.
• Added globalToShmemAsyncCopy. Demonstrates async copy of data from global to shared memory when on compute capability 8.0 or higher. Also demonstrates arrive-wait barrier for synchronization.
• Added simpleAWBarrier. Demonstrates arrive wait barriers.
• Added simpleAttributes. Demonstrates the stream attributes that affect L2 locality.
• Added warp aggregated atomic multi bucket increments kernel using labeled_partition cooperative groups in warpAggregatedAtomicsCG which can be used on compute capability 7.0 and above GPU architectures.
• Added binaryPartitionCG. Demonstrates binary partition cooperative groups and reduction within the thread block.
• Added two new reduction kernels in reduction one which demonstrates reduce_add_sync intrinstic supported on compute capability 8.0 and another which uses cooperative_groups::reduce function which does thread_block_tile level reduction introduced from CUDA 11.0.
• Added cudaCompressibleMemory. Demonstrates compressible memory allocation using cuMemMap API.
• Added simpleVulkanMMAP. Demonstrates Vulkan CUDA Interop via cuMemMap APIs.
• Added concurrentKernels. Demonstrates the use of CUDA streams for concurrent execution of several kernels on a GPU.
• Dropped Mac OSX support from all samples.

CUDA 10.2

• Added simpleD3D11. Demonstrates CUDA-D3D11 External Resource Interoperability APIs for updating D3D11 buffers from CUDA and synchronization between D3D11 and CUDA with Keyed Mutexes.
• Added simpleDrvRuntime. Demonstrates CUDA Driver and Runtime APIs working together to load fatbinary of a CUDA kernel.
• Added vectorAddMMAP. Demonstrates how cuMemMap API allows the user to specify the physical properties of their memory while retaining the contiguous nature of their access.
• Added memMapIPCDrv. Demonstrates Inter Process Communication using cuMemMap APIs.
• Added cudaNvSci. Demonstrates CUDA-NvSciBuf/NvSciSync Interop.
• Added jacobiCudaGraphs. Demonstrates Instantiated CUDA Graph Update with Jacobi Iterative Method using different approaches.
• Added cuSolverSp_LinearSolver. Demonstrates cuSolverSP's LU, QR and Cholesky factorization.
• Added MersenneTwisterGP11213. Demonstrates the Mersenne Twister random number generator GP11213 in cuRAND.

CUDA 10.1 Update 2

• Added vulkanImageCUDA. Demonstrates how to perform Vulkan image - CUDA Interop.
• Added nvJPEG_encoder. Demonstrates encoding of jpeg images using NVJPEG Library.
• Added Windows OS support to nvJPEG sample.
• Added boxFilterNPP. Demonstrates how to use NPP FilterBox function to perform a box filter.
• Added cannyEdgeDetectorNPP. Demonstrates the nppiFilterCannyBorder_8u_C1R Canny Edge Detection image filter function.

CUDA 10.1 Update 1

• Added NV12toBGRandResize. Demonstrates how to convert and resize NV12 frames to BGR planars frames using CUDA in batch.
• Added EGLStream_CUDA_Interop. Demonstrates data exchange between CUDA and EGL Streams.
• Added cuSolverDn_LinearSolver. Demonstrates cuSolverDN's LU, QR and Cholesky factorization.
• Added support of Visual Studio 2019 to all samples supported on Windows.

CUDA 10.1

• Added immaTensorCoreGemm. Demonstrates integer GEMM computation using the Warp Matrix Multiply and Accumulate (WMMA) API for integers employing the Tensor Cores.
• Added simpleIPC. Demonstrates Inter Process Communication with one process per GPU for computation.
• Added nvJPEG. Demonstrates single and batched decoding of jpeg images using NVJPEG Library.
• Added bandwidthTest. It measures the memcopy bandwidth of the GPU and memcpy bandwidth across PCI-e.
• Added reduction. Demonstrates several important optimization strategies for Data-Parallel Algorithms like reduction.
• Update all the samples to support CUDA 10.1.

CUDA 10.0

• Added simpleCudaGraphs. Demonstrates CUDA Graphs creation, instantiation and launch using Graphs APIs and Stream Capture APIs.
• Added conjugateGradientCudaGraphs. Demonstrates conjugate gradient solver on GPU using CUBLAS and CUSPARSE library calls captured and called using CUDA Graph APIs.
• Added simpleVulkan. Demonstrates Vulkan - CUDA Interop.
• Added simpleD3D12. Demonstrates DX12 - CUDA Interop.
• Added UnifiedMemoryPerf. Demonstrates performance comparision of various memory types involved in system.
• Added p2pBandwidthLatencyTest. Demonstrates Peer-To-Peer (P2P) data transfers between pairs of GPUs and computes latency and bandwidth.
• Added systemWideAtomics. Demonstrates system wide atomic instructions.
• Added simpleCUBLASXT. Demonstrates CUBLAS-XT library which performs GEMM operations over multiple GPUs.
• Added Windows OS support to conjugateGradientMultiDeviceCG sample.
• Removed support of Visual Studio 2010 from all samples.

CUDA 9.2

This is the first release of CUDA Samples on GitHub:

• Added vectorAdd_nvrtc. Demonstrates runtime compilation library using NVRTC of a simple vectorAdd kernel.
• Added warpAggregatedAtomicsCG. Demonstrates warp aggregated atomics using Cooperative Groups.
• Added deviceQuery. Enumerates the properties of the CUDA devices present in the system.
• Added matrixMul. Demonstrates a matrix multiplication using shared memory through tiled approach.
• Added matrixMulDrv. Demonstrates a matrix multiplication using shared memory through tiled approach, uses CUDA Driver API.
• Added cudaTensorCoreGemm. Demonstrates a GEMM computation using the Warp Matrix Multiply and Accumulate (WMMA) API introduced in CUDA 9, as well as the new Tensor Cores introduced in the Volta chip family.
• Added simpleVoteIntrinsics which uses *_sync equivalent of the vote intrinsics _any, _all added since CUDA 9.0.
• Added shfl_scan which uses *_sync equivalent of the shfl intrinsics added since CUDA 9.0.
• Added conjugateGradientMultiBlockCG. Demonstrates a conjugate gradient solver on GPU using Multi Block Cooperative Groups.
• Added conjugateGradientMultiDeviceCG. Demonstrates a conjugate gradient solver on multiple GPUs using Multi Device Cooperative Groups, also uses unified memory prefetching and usage hints APIs.
• Added simpleCUBLAS. Demonstrates how perform GEMM operations using CUBLAS library.
• Added simpleCUFFT. Demonstrates how perform FFT operations using CUFFT library.

Getting Started

Prerequisites

Download and install the CUDA Toolkit 11.1 for your corresponding platform. For system requirements and installation instructions of cuda toolkit, please refer to the Linux Installation Guide, and the Windows Installation Guide.

Getting the CUDA Samples

Using git clone the repository of CUDA Samples using the command below.

git clone https://github.com/NVIDIA/cuda-samples.git

Without using git the easiest way to use these samples is to download the zip file containing the current version by clicking the "Download ZIP" button on the repo page. You can then unzip the entire archive and use the samples.

Building CUDA Samples

Windows

The Windows samples are built using the Visual Studio IDE. Solution files (.sln) are provided for each supported version of Visual Studio, using the format:

*_vs<version>.sln - for Visual Studio <version>

Complete samples solution files exist at parent directory of the repo:

Each individual sample has its own set of solution files at: <CUDA_SAMPLES_REPO>\Samples\<sample_dir>\

To build/examine all the samples at once, the complete solution files should be used. To build/examine a single sample, the individual sample solution files should be used.

Linux

The Linux samples are built using makefiles. To use the makefiles, change the current directory to the sample directory you wish to build, and run make:

$ cd <sample_dir>
$ make

The samples makefiles can take advantage of certain options:

• TARGET_ARCH= - cross-compile targeting a specific architecture. Allowed architectures are x86_64, ppc64le, armv7l, aarch64. By default, TARGET_ARCH is set to HOST_ARCH. On a x86_64 machine, not setting TARGET_ARCH is the equivalent of setting TARGET_ARCH=x86_64.
  $ make TARGET_ARCH=x86_64
$ make TARGET_ARCH=ppc64le
$ make TARGET_ARCH=armv7l
$ make TARGET_ARCH=aarch64
  See here for more details on cross platform compilation of cuda samples.

• dbg=1 - build with debug symbols

  $ make dbg=1
  

• SMS="A B ..." - override the SM architectures for which the sample will be built, where "A B ..." is a space-delimited list of SM architectures. For example, to generate SASS for SM 50 and SM 60, use SMS="50 60".

  $ make SMS="50 60"
  

• HOST_COMPILER=<host_compiler> - override the default g++ host compiler. See the Linux Installation Guide for a list of supported host compilers.

  $ make HOST_COMPILER=g++
  

Samples list

Samples by OS

Linux

warpAggregatedAtomicsCG	boxFilterNPP	binaryPartitionCG	dmmaTensorCoreGemm
EGLStream_CUDA_Interop	conjugateGradientMultiBlockCG	simpleIPC	memMapIPCDrv
vectorAddMMAP	shfl_scan	simpleZeroCopy	conjugateGradientCudaGraphs
globalToShmemAsyncCopy	cudaNvSciNvMedia	nvJPEG	batchedLabelMarkersAndLabelCompressionNPP
watershedSegmentationNPP	simpleCudaGraphs	deviceQuery	simpleVoteIntrinsics
simpleCUBLASXT	simpleAttributes	cudaNvSci	tf32TensorCoreGemm
UnifiedMemoryPerf	cudaCompressibleMemory	bf16TensorCoreGemm	cuSolverDn_LinearSolver
vulkanImageCUDA	conjugateGradientMultiDeviceCG	matrixMulDrv	cuSolverSp_LinearSolver
simpleCUFFT	reduction	nvJPEG_encoder	simpleDrvRuntime
MersenneTwisterGP11213	simpleAWBarrier	immaTensorCoreGemm	bandwidthTest
concurrentKernels	simpleCUBLAS	NV12toBGRandResize	cudaTensorCoreGemm
jacobiCudaGraphs	simpleVulkan	vectorAdd_nvrtc	cannyEdgeDetectorNPP
p2pBandwidthLatencyTest	simpleVulkanMMAP	cudaOpenMP	matrixMul
systemWideAtomics

Windows

warpAggregatedAtomicsCG	boxFilterNPP	binaryPartitionCG	dmmaTensorCoreGemm
conjugateGradientMultiBlockCG	simpleIPC	memMapIPCDrv	vectorAddMMAP
shfl_scan	simpleZeroCopy	conjugateGradientCudaGraphs	globalToShmemAsyncCopy
nvJPEG	batchedLabelMarkersAndLabelCompressionNPP	simpleD3D12	watershedSegmentationNPP
simpleCudaGraphs	deviceQuery	simpleVoteIntrinsics	simpleCUBLASXT
simpleAttributes	tf32TensorCoreGemm	UnifiedMemoryPerf	cudaCompressibleMemory
bf16TensorCoreGemm	cuSolverDn_LinearSolver	vulkanImageCUDA	conjugateGradientMultiDeviceCG
matrixMulDrv	cuSolverSp_LinearSolver	simpleCUFFT	reduction
nvJPEG_encoder	simpleDrvRuntime	simpleD3D11	MersenneTwisterGP11213
simpleAWBarrier	immaTensorCoreGemm	bandwidthTest	concurrentKernels
simpleCUBLAS	NV12toBGRandResize	cudaTensorCoreGemm	jacobiCudaGraphs
simpleVulkan	vectorAdd_nvrtc	cannyEdgeDetectorNPP	p2pBandwidthLatencyTest
simpleVulkanMMAP	cudaOpenMP	matrixMul

Dependencies

Some CUDA Samples rely on third-party applications and/or libraries, or features provided by the CUDA Toolkit and Driver, to either build or execute. These dependencies are listed below.

If a sample has a third-party dependency that is available on the system, but is not installed, the sample will waive itself at build time.

Each sample's dependencies are listed in its README's Dependencies section.

Third-Party Dependencies

These third-party dependencies are required by some CUDA samples. If available, these dependencies are either installed on your system automatically, or are installable via your system's package manager (Linux) or a third-party website.

FreeImage

FreeImage is an open source imaging library. FreeImage can usually be installed on Linux using your distribution's package manager system. FreeImage can also be downloaded from the FreeImage website. FreeImage is also redistributed with the CUDA Samples.

Message Passing Interface

MPI (Message Passing Interface) is an API for communicating data between distributed processes. A MPI compiler can be installed using your Linux distribution's package manager system. It is also available on some online resources, such as Open MPI. On Windows, to build and run MPI-CUDA applications one can install MS-MPI SDK.

Only 64-Bit

Some samples can only be run on a 64-bit operating system.

DirectX

DirectX is a collection of APIs designed to allow development of multimedia applications on Microsoft platforms. For Microsoft platforms, NVIDIA's CUDA Driver supports DirectX. Several CUDA Samples for Windows demonstrates CUDA-DirectX Interoperability, for building such samples one needs to install Microsoft Visual Studio 2012 or higher which provides Microsoft Windows SDK for Windows 8.

DirectX12

DirectX 12 is a collection of advanced low-level programming APIs which can reduce driver overhead, designed to allow development of multimedia applications on Microsoft platforms starting with Windows 10 OS onwards. For Microsoft platforms, NVIDIA's CUDA Driver supports DirectX. Few CUDA Samples for Windows demonstrates CUDA-DirectX12 Interoperability, for building such samples one needs to install Windows 10 SDK or higher, with VS 2015 or VS 2017.

OpenGL

OpenGL is a graphics library used for 2D and 3D rendering. On systems which support OpenGL, NVIDIA's OpenGL implementation is provided with the CUDA Driver.

OpenGL ES

OpenGL ES is an embedded systems graphics library used for 2D and 3D rendering. On systems which support OpenGL ES, NVIDIA's OpenGL ES implementation is provided with the CUDA Driver.

Vulkan

Vulkan is a low-overhead, cross-platform 3D graphics and compute API. Vulkan targets high-performance realtime 3D graphics applications such as video games and interactive media across all platforms. On systems which support Vulkan, NVIDIA's Vulkan implementation is provided with the CUDA Driver. For building and running Vulkan applications one needs to install the Vulkan SDK.

OpenMP

OpenMP is an API for multiprocessing programming. OpenMP can be installed using your Linux distribution's package manager system. It usually comes preinstalled with GCC. It can also be found at the OpenMP website.

Screen

Screen is a windowing system found on the QNX operating system. Screen is usually found as part of the root filesystem.

X11

X11 is a windowing system commonly found on *-nix style operating systems. X11 can be installed using your Linux distribution's package manager, and comes preinstalled on Mac OS X systems.

EGL

EGL is an interface between Khronos rendering APIs (such as OpenGL, OpenGL ES or OpenVG) and the underlying native platform windowing system.

EGLOutput

EGLOutput is a set of EGL extensions which allow EGL to render directly to the display.

EGLSync

EGLSync is a set of EGL extensions which provides sync objects that are synchronization primitive, representing events whose completion can be tested or waited upon.

NVSCI

NvSci is a set of communication interface libraries out of which CUDA interops with NvSciBuf and NvSciSync. NvSciBuf allows applications to allocate and exchange buffers in memory. NvSciSync allows applications to manage synchronization objects which coordinate when sequences of operations begin and end.

NvMedia

NvMedia provides powerful processing of multimedia data for true hardware acceleration across NVIDIA Tegra devices. Applications leverage the NvMedia Application Programming Interface (API) to process the image and video data.

CUDA Features

These CUDA features are needed by some CUDA samples. They are provided by either the CUDA Toolkit or CUDA Driver. Some features may not be available on your system.

CUFFT Callback Routines

CUFFT Callback Routines are user-supplied kernel routines that CUFFT will call when loading or storing data. These callback routines are only available on Linux x86_64 and ppc64le systems.

CUDA Dynamic Parallellism

CDP (CUDA Dynamic Parallellism) allows kernels to be launched from threads running on the GPU. CDP is only available on GPUs with SM architecture of 3.5 or above.

Multi-block Cooperative Groups

Multi Block Cooperative Groups(MBCG) extends Cooperative Groups and the CUDA programming model to express inter-thread-block synchronization. MBCG is available on GPUs with Pascal and higher architecture.

Multi-Device Cooperative Groups

Multi Device Cooperative Groups extends Cooperative Groups and the CUDA programming model enabling thread blocks executing on multiple GPUs to cooperate and synchronize as they execute. This feature is available on GPUs with Pascal and higher architecture.

CUBLAS

CUBLAS (CUDA Basic Linear Algebra Subroutines) is a GPU-accelerated version of the BLAS library.

CUDA Interprocess Communication

IPC (Interprocess Communication) allows processes to share device pointers.

CUFFT

CUFFT (CUDA Fast Fourier Transform) is a GPU-accelerated FFT library.

CURAND

CURAND (CUDA Random Number Generation) is a GPU-accelerated RNG library.

CUSPARSE

CUSPARSE (CUDA Sparse Matrix) provides linear algebra subroutines used for sparse matrix calculations.

CUSOLVER

CUSOLVER library is a high-level package based on the CUBLAS and CUSPARSE libraries. It combines three separate libraries under a single umbrella, each of which can be used independently or in concert with other toolkit libraries. The intent ofCUSOLVER is to provide useful LAPACK-like features, such as common matrix factorization and triangular solve routines for dense matrices, a sparse least-squares solver and an eigenvalue solver. In addition cuSolver provides a new refactorization library useful for solving sequences of matrices with a shared sparsity pattern.

NPP

NPP (NVIDIA Performance Primitives) provides GPU-accelerated image, video, and signal processing functions.

NVGRAPH

NVGRAPH is a GPU-accelerated graph analytics library.

NVJPEG

NVJPEG library provides high-performance, GPU accelerated JPEG decoding functionality for image formats commonly used in deep learning and hyperscale multimedia applications.

NVRTC

NVRTC (CUDA RunTime Compilation) is a runtime compilation library for CUDA C++.

Stream Priorities

Stream Priorities allows the creation of streams with specified priorities. Stream Priorities is only available on GPUs with SM architecture of 3.5 or above.

Unified Virtual Memory

UVM (Unified Virtual Memory) enables memory that can be accessed by both the CPU and GPU without explicit copying between the two. UVM is only available on Linux and Windows systems.

16-bit Floating Point

FP16 is a 16-bit floating-point format. One bit is used for the sign, five bits for the exponent, and ten bits for the mantissa.

C++11 CUDA

NVCC support of C++11 features.

Contributors Guide

We welcome your input on issues and suggestions for samples. At this time we are not accepting contributions from the public, check back here as we evolve our contribution model.

We use Google C++ Style Guide for all the sources https://google.github.io/styleguide/cppguide.html

Frequently Asked Questions

Answers to frequently asked questions about CUDA can be found at http://developer.nvidia.com/cuda-faq and in the CUDA Toolkit Release Notes.

References

• CUDA Programming Guide
• Accelerated Computing Blog