streams_result[i*segment_size:(i+1)*segment_size]=z_streams_device[i*segment_size:(i+1)*segment_size].copy_to_host(stream=stream_list[i])cuda.synchronize()print("gpu streams vector add time "+str(time()-start))if(np.array_equal(default_stream_result,streams_result)):print("result c...
intfilter(int*dst,constint*src,intn){intnres=0;for(inti=0;i<n;i++)if(src[i]>0)dst[nres++]=src[i];// return the number of elements copiedreturnnres;} 过滤,也称为流压缩(stream compaction),是一种常见的操作,它是许多编程语言标准库的一部分,它有多种名称,包括 grep、copy_if、select ...
int k=i+offset; if(k<n) res[i]=a[k]+b[k]; } int main(int argc,char **argv) { int dev = 0; cudaSetDevice(dev); int nElem=1<<18; int offset=0; if(argc>=2) offset=atoi(argv[1]); printf("Vector size:%d\n",nElem); int nByte=sizeof(float)*nElem; float *a_h=(flo...
Copy __global__ void calculate_forces(void *devX, void *devA) { extern __shared__ float4[] shPosition; float4 *globalX = (float4 *)devX; float4 *globalA = (float4 *)devA; float4 myPosition; int i, tile; float3 acc = {0.0f, 0.0f, 0.0f}; int gtid = blockIdx...
if (threadIdx.x == 0) { child_launch<<< 1, 256 >>>(data); cudaDeviceSynchronize(); } __syncthreads(); } void host_launch(int *data) { parent_launch<<< 1, 256 >>>(data); } D.2.2.1.2. Zero Copy Memory 零拷贝系统内存与全局内存具有相同的一致性和一致性保证,并遵循上面详述的语...
· On some devices, page-locked host memory can be mapped into the address space of the device, eliminating the need to copy it to or from device memory as detailed inMapped Memory. · On systems with a front-side bus, bandwidth between host memory and device memory is higher if host ...
This is useful if the user is interested in the life range of any particular register, or register usage in general. Here’s a sample output (output is pruned for brevity): // +---+---+ // | GPR | PRED | // | | | // | | | // | 000000000011 | | // | # 012345678901 ...
If this information is missing from the CUDA binary, either use the nvdisasm option -ndf to turn off control flow analysis, or use the ptxas and nvlink option -preserve-relocs to re-generate the cubin file. For a list of CUDA assembly instruction set of each GPU architecture, see ...
intmain(){printf("run_on_cpu_or_gpu CPU: %d\n",run_on_cpu_or_gpu());{int ret=run_on_gpu<<<1,1>>>();// error!!!even if run_on_gpu return int!!}printf("will end\n");return0;} 还有人会问,上面main函数怎么没有用修饰符修饰?cuda编程规定如果没有使用修饰符修饰的默认就是__...
//Copy result back to host memory from device memory cudaMemcpy(h_c, d_c, N * sizeof(int), cudaMemcpyDeviceToHost); cudaDeviceSynchronize(); int Correct = 1; printf("Vector addition on GPU \n"); //Printing result on console for (int i = 0; i < N; i++) { if ((h_a[i...