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This post is the first in a series on CUDA C and C++, which is the C/C++ interface to the CUDA parallel computing platform.In my last post I gave an overview of differences in the way GPUs execute code from a CPU, and how an NVIDIA GPU compiles down CUDA code into an intermediate assembly language called PTX before it assembles them into binaries. This series of posts assumes familiarity with programming in C. We will be running a parallel series of posts about CUDA Fortran targeted at Fortran programmers. These two series will cover the basic concepts of parallel computing on the CUDA platform. From here on unless I state otherwise, I will use the term “CUDA C” as shorthand for “CUDA C and C++”. CUDA C is essentially C/C++ with a few extensions that allow one to execute functions on the GPU using many threads in parallel. CUDA Programming Model Basicsīefore we jump into CUDA C code, those new to CUDA will benefit from a basic description of the CUDA programming model and some of the terminology used. The CUDA programming model is a heterogeneous model in which both the CPU and GPU are used. In CUDA, the host refers to the CPU and its memory, while the device refers to the GPU and its memory. Code run on the host can manage memory on both the host and device, and also launches kernels which are functions executed on the device. Given the heterogeneous nature of the CUDA programming model, a typical sequence of operations for a CUDA C program is: These kernels are executed by many GPU threads in parallel. Declare and allocate host and device memory.Transfer data from the host to the device.Transfer results from the device to the host.Keeping this sequence of operations in mind, let’s look at a CUDA C example. In a recent post, I illustrated Six Ways to SAXPY, which includes a CUDA C version. SAXPY stands for “Single-precision A*X Plus Y”, and is a good “hello world” example for parallel computation. Int i = blockIdx.x*blockDim.x + threadIdx.x ĬudaMemcpy(y, d_y, N*sizeof(float), cudaMemcpyDeviceToHost) Void saxpy(int n, float a, float *x, float *y) In this post I will dissect a more complete version of the CUDA C SAXPY, explaining in detail what is done and why. The information between the triple chevrons is the execution configuration, which dictates how many device threads execute the kernel in parallel. In CUDA there is a hierarchy of threads in software which mimics how thread processors are grouped on the GPU. In the CUDA programming model we speak of launching a kernel with a grid of thread blocks. The first argument in the execution configuration specifies the number of thread blocks in the grid, and the second specifies the number of threads in a thread block. Thread blocks and grids can be made one-, two- or three-dimensional by passing dim3 (a simple struct defined by CUDA with x, y, and z members) values for these arguments, but for this simple example we only need one dimension so we pass integers instead. In this case we launch the kernel with thread blocks containing 256 threads, and use integer arithmetic to determine the number of thread blocks required to process all N elements of the arrays ( (N+255)/256).įor cases where the number of elements in the arrays is not evenly divisible by the thread block size, the kernel code must check for out-of-bounds memory accesses. Cleaning UpĪfter we are finished, we should free any allocated memory. For device memory allocated with cudaMalloc(), simply call cudaFree(). In CUDA, we define kernels such as saxpy using the _global_ declaration specifier. Variables defined within device code do not need to be specified as device variables because they are assumed to reside on the device. In this case the n, a and i variables will be stored by each thread in a register, and the pointers x and y must be pointers to the device memory address space. This is indeed true because we passed d_x and d_y to the kernel when we launched it from the host code. The first two arguments, n and a, however, were not explicitly transferred to the device in host code. Because function arguments are passed by value by default in C/C++, the CUDA runtime can automatically handle the transfer of these values to the device. |
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