Future Directions for CUDA Presented by Robert Strzodka
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1 Future Directions for CUDA Presented by Robert Strzodka Authored by Mark Harris NVIDIA Corporation
2 Platform for Parallel Computing Platform The CUDA Platform is a foundation that supports a diverse parallel computing ecosystem.
3 Platform for Parallel Computing Compiler Tool Chain Programming Languages NVCC C Templates Inheritance Recursion Function pointers C++ Fortran (PGI) UVA Device Code LLVM Linking C++ new/delete Virtual functions OpenACC Dynamic Parallelism Platform Libraries Developer Tools cublas cufft Command- Line Profiler cuda-gdb Visual Profiler NVPP GPUDirect cusparse curand cuda-memcheck nvidia-smi Thrust GPU-Aware MPI new NVPP functions Nsight IDE New Visual Profiler cublas Device API Nsight Eclipse Ed. Detect Shared Memory Hazards
4 Investing in the Future Programming Model Enabling More Programmers Future Computing Platforms Platform <<<...>>>
5 serial_sort(sorted, data, N); parallel_sort <<<... >>> (sorted, data, N); Unified Programming Language
6 Unified Run-Time Interface int main() { float *data; setup(data); } A <<<... >>> (data); B <<<... >>> (data); C <<<... >>> (data); cudadevicesynchronize(); return 0; CUDA Dynamic Parallelism global void B(float *data) { do_stuff(data); X <<<... >>> (data); Y <<<... >>> (data); Z <<<... >>> (data); cudadevicesynchronize(); CPU main A B C GPU X Y Z } do_more_stuff(data);
7 void sortfile(file *fp, int N) { char *data = (char*)malloc(n); char *sorted = (char*)malloc(n); fread(data, 1, N, fp); char *d_data, *d_sorted; cudamalloc(&d_data, N); cudamalloc(&d_sorted, N); cudamemcpy(d_data, data, N,...); parallel_sort<<<... >>>(d_sorted, d_data, N); cudamemcpy(sorted, d_sorted, N,...); cudafree(d_data); cudafree(d_sorted); } use_data(sorted); free(data); free(sorted);
8 void sortfile(file *fp, int N) { char *data = (char*)malloc(n); char *sorted = (char*)malloc(n); fread(data, 1, N, fp); Unified Virtual Memory parallel_sort<<<... >>>(sorted, data, N); } use_data(sorted); free(data); free(sorted);
9 DP GFLOPS per Watt Simpler, More Integrated Programming Maxwell Unified Virtual Memory 8 6 Kepler 4 2 Tesla Fermi Unified Run-Time 2008 Unified Language
10 Diversity of Programming Languages
11 Enabling More Programming Languages Developers want to build front-ends for Python, Java, R, DSLs CUDA C, C++, Fortran LLVM Compiler For CUDA New Language Support Target other processors like ARM, FPGAs, GPUs, x86 NVIDIA GPUs x86 CPUs New Processor Support
12 Enabling More Programming Languages CUDA C, C++, Fortran New Language Support LLVM Compiler For CUDA NVIDIA GPUs x86 CPUs New Processor Support Mozilla Rust Halide (
13 Rapid Development Powerful Libraries Large Community Commercial Support
14 Is Python Fast Enough for HPC? Python apps often implement performance critical functions in C/C++.
15 Compile Python for Parallel Architectures Anaconda Accelerate from Continuum Analytics NumbaPro array-oriented compiler for Python & NumPy Compile for CPUs or GPUs (uses LLVM + NVIDIA Compiler SDK) Fast Development + Fast Execution: Ideal Combination Free Academic License
16 CUDA argtypes=[f8, f8, uint32], device=true) def mandel(x, y, max_iters): zr, zi = 0.0, 0.0 for i in range(max_iters): newzr = (zr*zr-zi*zi)+x zi = 2*zr*zi+y zr = newzr if (zr*zr+zi*zi) >= 4: return i return 255 CUDA Programming, Python f8, f8, f8, f8, uint32]) def mandel_kernel(img, xmin, xmax ymin, ymax, iters): x, y = cuda.grid(2) if x < img.shape[0] and y < img.shape[1]: img[y, x] = mandel(min_x+x*((max_x-min_x)/img.shape[0]), min_y+y*((max_y-min_y)/img.shape[1]), iters) gimage = np.zeros((1024, 1024), dtype = np.uint8) d_image = cuda.to_device(gimage) mandel_kernel[(32,32), (32,32)](d_image, -2.0, 1.0, -1.0, 1.0, 20) d_image.to_host() Mandelbrot Time Speedup v. Pure Python Pure Python 4.85s -- NumbaPro (CPU) 0.11s 44x CUDA Python (K20).004s 1221x
17
18 KAYLA
19 Kayla Development Platform CUDA 5 OpenGL 4.3 Kick starts ARM + CUDA Ecosystem NAMD Ported in 2 Days Quad ARM + Kepler GPU Quad ARM + Any CUDA GPU
20 Platform for Parallel Computing Platform Compiler Tool Chain Programming Languages Libraries Developer Tools NVCC C cublas cufft Command- Line Profiler cuda-gdb Visual Profiler Templates NVPP C++ Fortran (PGI) GPUDirect Inheritance Recursion Function pointers cusparse curand cuda-memcheck nvidia-smi UVA Thrust Device Code LLVM Linking C++ new/delete Virtual functions GPU-Aware MPI new NVPP functions Nsight IDE New Visual Profiler OpenACC Dynamic Parallelism cublas Device API Nsight Eclipse Ed. Detect Shared Memory Hazards
21 Platform for Parallel Computing Compiler Tool Chain JIT Linking JIT Compilation Programming Languages 5.0 C++11 Platform Libraries ARM Support Sparse Solvers Multi-GPU Support Developer Tools Profiler Step-by-Step Guidance Single-GPU Debugging
22 Future Challenges Today Easier Parallel Programming Optimizing locality and computation Task, Thread & Data Parallelism Hybrid operating system Enablement Parallel Compiler Foundation Enablement Ubiquitous parallel programming Power Aware Programming
23 GPUs Everywhere MPI
24 Thank you
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