GPU & Cuda: data transmission test between host and Device

Data transmission test: first transmitted from the host to the device, then transmitted within the device, and then from the device to the host.

H --> d

D --> d

D --> H

1 // movearrays. cu 2 // 3 // demonstrates Cuda interface to data allocation on device (GPU) 4 // and data movement between host (CPU) and device. 5 6 7 # include <stdio. h> 8 # include <assert. h> 9 # include <Cuda. h> 10 # include "cuda_runtime.h" 11 # include "device_launch_parameters.h" 12 INT main (void) 13 {14 float * a_h, * B _h; // pointer to host 15 float * a_d, * B _d; // pointer to device 16 17 int n = 14; 18 int I; 19 // apply for memory 20 a_h = (float *) malloc (sizeof (float) * n) on the host side; 21 B _h = (float *) malloc (sizeof (float) * n); 22 // apply to store 23 cudamalloc (void **) & a_d, sizeof (float) * n) on the device side; 24 cudamalloc (void **) & B _d, sizeof (float) * n); 25 // host data initialization 26 for (I = 0; I <n; I ++) {27 a_h [I] = 10.f + I; 28 B _h [I] = 0.f; 29} 30 // transmit data from the host to the device: a_h --> a_d31 cudamemcpy (a_d, a_h, sizeof (float) * n, cudamemcpyhosttodevice); 32 33 // transmit data within the device 34 cudamemcpy (B _d, a_d, sizeof (float) * n, cudamemcpydevicetodevice); 35 36 // transmit data from the device to the Host: B _d --> B _h37 cudamemcpy (B _h, B _d, sizeof (float) * n, cudamemcpydevicetohost ); 38 39 // check result 40 for (I = 0; I <n; I ++) 41 assert (a_h [I] = B _h [I]); 42 43 // release Host Storage 44 free (a_h); 45 free (B _h); 46 // release device storage 47 cudafree (a_d); 48 cudafree (B _d ); 49}

Test environment:

Win7 + vs2013 + cuda6.5

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GPU & Cuda: data transmission test between host and Device