copy string from host to string

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi:

I would like to know a way to copy array of string data (char**) from host to string. and then do some manipulation on these data elements.

example:
char** ss={“Hello”, “Hello1”, and so on}

I want to copy them to device from host

I could copy a character array into device from host. However, i am not able to do with char**.

Please help in solving this problem.

I greatly appreciate your help.

Thanks

2

global memory dereferencing is not allowed in kernel, you may pad each ss[i] into uniform-length prior to the kernel, and unpack them after copying them back.

3

It is allowed, you just need to be very careful how you construct your list of pointers on the host. It is usually much easier and less bug prone to allocate a 2D like data structure with padding, as you suggest.

4

Thank you so much for all your kind suggestions.

What does pad each ss[i] means? Could you kindly give some more details?

I really appreciate all your kind help and support.

I was trying to copy the pointers as it is into the device memory and the pointer are lost cause the pointers are pointing to the host memory, however, i am looking into the device memory.

5

Say your maximum string size is 32. Resize all of your strings so they contain 32 elements, and voila, you don’t even need pointers to each individual element–pass a pointer to the start of the array and the number of elements, and you can easily figure out where a string starts.