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...
· 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 ...
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...
//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...
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 ...
Optional: when remote debugging, to abort the launch when a file fails to copy to the remote system, set the Abort on synchronize failure option to “True.” Note If you are using the Next-Gen CUDA debugger: The Connection, Launch, and Security options are not currently supported. Please ...
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__...