Memset problem

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi,

I write that code just for check if memset is working properly

float * distanceTransformDevice;

cutilSafeCall(cudaMalloc((void**)&distanceTransformDevice,sizeof(float)*SCREEN_RES));

cutilSafeCall(cudaMemset((void**)distanceTransformDevice,2.,sizeof(float)*SCREEN_RES));

float * distanceTransform=new float[SCREEN_RES];

cutilSafeCall(cudaMemcpy(distanceTransform,distanceTransformDevice,sizeof(float)*SCREEN_RES,cudaMemcpyDeviceToHost));

//Print distanceTransform to File

But the file do not contain '2.'s (which should). Does anyone knows why?

Thank you very much.

2

This will happen for you in regular c++ as well… nothing to do with CUDA.

You can only use memset to set an array items like this for BYTE/char elements (element size 1)…

eyal

3

I didn’t know that. I thought that everything should work correctly since I set right the number of bytes. But you are right. It just works for char/Byte arrays.

Thank you very much.