cudaHostAllocMapped: Maps the allocation into the CUDA address space. The device pointer to the memory may be obtained by calling cudaHostGetDevicePointer(). cudaHostAllocWriteCombined: Allocates the memory as write-combined (WC). WC memory can be transferred across the PCI Express bus more qu...
CUDA 还提供了一种模式,宿主机器上一块固定的内存区域 (pinned memory) 可以被配置成允许被 GPU 直接读写。在这种配置下,固定内存又被称作零拷贝(zero-copy)或者映射的内存(mapped memory),最关键的就是cudaHostAlloc函数了,上表展示了一些 API。 要设置零拷贝操作,一块宿主的内存池需要先被cudaAllocHost(......
1. Issue or feature description I am trying to figure out why my container cannot allocate a certain block of pinned memory past about 1GB of RAM. One of our algorithms uses a 2GB fixed memory pool of pinned memory that it pulls and retu...
}intmain(void){intN =1<<20;float*x, *y;// Allocate Unified Memory -- accessible from CPU or GPUcudaMallocManaged(&x, N*sizeof(float)); cudaMallocManaged(&y, N*sizeof(float));// initialize x and y arrays on the hostfor(inti =0; i < N; i++) { x[i] =1.0f; y[i] =...
Passes back device pointer of mapped host memory allocated by cudaHostAlloc or registered by cudaHostRegister. __host__ cudaError_t cudaHostGetFlags ( unsigned int* pFlags, void* pHost ) Passes back flags used to allocate pinned host memory allocated by cudaHostAlloc. __host__ ...
CUDA Memory Model 对于程序员来说,memory可以分为下面两类: Programmable:我们可以灵活操作的部分。 Non-programmable:不能操作,由一套自动机制来达到很好的性能。 在CPU的存储结构中,L1和L2 cache都是non-programmable的。对于CUDA来说,programmable的类型很丰富: ...
{//Defining host variablesint h_a, h_b, h_c;//Defining Device Pointersint *d_a, *d_b, *d_c;//Initializing host variablesh_a = 1;h_b = 4;cudaError_t cudaStatus;// Allocate GPU buffers for three vectors (two input, one output) .cudaStatus = cudaMalloc((void**)&d_c, ...
You should not over-allocate pinned memory. Doing so can reduce overall system performance because it reduces the amount of physical memory available to the operating system and other programs. How much is too much is difficult to tell in advance, so as with all optimizations, test your applica...
Allocate pinned host memory. Arguments: - `size`: Size of the allocation in bytes - `mapped`: Whether the allocated memory should be mapped into the CUDA address space. - `portable`: Whether the memory will be considered pinned by all ...
cudaSetDevice(0); // Set device 0 as current float* p0; size_t size = 1024 * sizeof(float); cudaMalloc(&p0, size); // Allocate memory on device 0 cudaSetDevice(1); float* p1; cudaMalloc(&p1, size); // Allocate memory on device 1 cudaSetDevice(0); // Set Device 0 as Current...