Maximizing Shared Memory Bandwidth on NVIDIA Kepler GPUs

February 17th, 2014

This tutorial by Dan Cyca outlines the shared memory configurations for NVIDIA Fermi and Kepler architectures, and demonstrates how to rewrite kernels to take advantage of the changes in Kepler’s shared memory architecture.

Acceleware CUDA Training Feb 25-28, 2014

January 15th, 2014

Developed in partnership with NVIDIA, this hands-on four day course will teach how to write and optimize applications that fully leverage the multi-core processing capabilities of the GPU. Benefits include:

  • Hands-on exercises and progressive lectures
  • Individual laptops equipped with NVIDIA GPUs for student use
  • Small class sizes to maximize learning
  • 90 days post training support – NEW!

February 25-28, 2014, Baltimore, MD, USA, details and registration.

Webinar: CUDA Tools for Optimal Performance and Productivity

December 30th, 2013

This webinar recording provides an overview of the profiling techniques and the tools available to help you optimize your code. It examines NVIDIA’s Visual Profiler and cuobjdump and highlight the various methods available for understanding the performance of CUDA program. The second part of the session focuses on debugging techniques and the tools available to help identify issues in kernels. The debugging tools provided in CUDA 5.5 including NSight and cuda-memcheck are discussed. The webinar recording can be accessed here.

Linear Algebra Library ViennaCL 1.5.0 released

December 23rd, 2013

The latest release 1.5.0 of the free open source linear algebra library ViennaCL is now available for download. The library provides a high-level C++ API similar to Boost.ublas and aims at providing the performance of accelerators at a high level of convenience without having to deal with hardware details. Some of the highlights from the ChangeLog are as follows: Vectors and matrices of integers are now supported, multiple OpenCL contexts can be used in a fully multi-threaded manner, products of sparse and dense matrices are now available, and certain BLAS functionality is also provided through a shared library for use with programming languages other than C++, e.g. C, Fortran, or Python.

Webinar: How to Improve Performance using the CUDA Memory Model and Features of the Kepler Architecture

December 20th, 2013

This webinar explores the memory model of the GPU and the memory enhancements available in the Kepler architecture, and how these will affect performance optimization. The webinar begins with an essential overview of GPU architecture and thread cooperation before focusing on the different memory types available on the GPU. We define shared, constant and global memory and discuss the best locations to store your application data for optimized performance. The shuffle instruction, new shared memory configurations and Read-Only Data Cache of the Kepler architecture are introduced and optimization techniques discussed. Click here to view the webinar recording.

VexCL 1.0.0 released with CUDA support

November 20th, 2013

VexCL is a modern C++ library created for ease of GPGPU development with C++. VexCL strives to reduce the amount of boilerplate code needed to develop GPGPU applications. The library provides a convenient and intuitive notation for vector arithmetic, reduction, sparse matrix-vector multiplication, etc. The source code is available under the permissive MIT license. As of v1.0.0, VexCL provides two backends: OpenCL and CUDA. Users may choose either of those at compile time with a preprocessor macro definition. More information is available at the GitHub project page and release notes page.

Allinea DDT with support for NVIDIA CUDA 5.5 and CUDA on ARM

November 13th, 2013

Allinea DDT is part of Allinea Software’s unified tools platform, which provides a single powerful and intuitive environment for debugging and profiling of parallel and multithreaded applications. It is widely used by computational scientists and scientific programmers to fix software defects of parallel applications running on hybrid GPU clusters and supercomputers. DDT 4.1.1 supports CUDA 5.5, C++11 and the GNU 4.8 compilers. Also introduced with Allinea DDT 4.1.1 is CUDA toolkit debugging support for ARMv7 architectures. More information:

Libra 3.0 – GPGPU SDK on Mobiles and Tablets

November 13th, 2013

The Libra 3.0 Heterogeneous Cloud Computing SDK has recently been released by GPU Systems. It supports PC, Tablet and Mobile Devices and includes a new virtualizing function for cloud compute services of local and remote CPUs and GPUs. C/C++, Java, C# and Matlab are supported. Read the full press release here.

Which is faster Constant Cache or Read-only Cache? – Part Two

November 4th, 2013

One of the keys to achieving maximum performance in CUDA is taking advantage of the various memory spaces. Part II of Acceleware’s tutorial has now been published. The tutorial uses a simple encryption kernel to test and compare read-only cache, constant cache and global memory. Read the full tutorial…

A GPU-based Streaming Algorithm for High-Resolution Cloth Simulation

October 19th, 2013


We present a GPU-based streaming algorithm to perform high-resolution and accurate cloth simulation. We map all the components of cloth simulation pipeline, including time integration, collision detection, collision response, and velocity updating to GPU-based kernels and data structures. Our algorithm perform intra-object and interobject collisions, handles contacts and friction, and is able to accurately simulate folds and wrinkles. We describe the streaming pipeline and address many issues in terms of obtaining high throughput on many-core GPUs. In practice, our algorithm can perform high-fidelity simulation on a cloth mesh with 2M triangles using 3GB of GPU memory. We highlight the parallel performance of our algorithm on three different generations of GPUs. On a high-end NVIDIA Tesla K20c, we observe up to two orders of magnitude performance improvement as compared to a single-threaded CPU-based algorithm, and about one order of magnitude improvement over a 16-core CPUbased parallel implementation.

(Min Tang, Roufeng Tong, Rahul Narain, Chang Meng and Dinesh Manocha: “A GPU-based Streaming Algorithm for High-Resolution Cloth Simulation”, in the Proceedings of Pacific Graphics 2013. [WWW])

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