matlab struct to gpuArray

Question

EssGee 2013-4-12

Is it possible to transfer a matlab struct to the GPU? So for example is something like this possible:

s.a = 1
s.b = [1; 2; 3]
s.c = []
s.d = 5
sgpu = gpuArray(s)

Answer 1

Edric Ellis 2013-4-12

You cannot make a structure on the gpu, but you can make a structure containing gpuArrays.

s.a = gpuArray(1)
s.b = gpuArray([1; 2; 3]);
...

EssGee 2013-4-12

Thanks Eric, I was hoping not to go that route. So if the structure has many variables , they would have to individually transferred as you mention.

I assume each of these operations corresponds to a cudaMEMcpy, or is it an asynchronous memcopy with unified memory?

Edric Ellis 2013-4-15

You can use STRUCTFUN to convert a bunch of fields at a time, like this

s.a = magic(3); s.b = magic(4);
gs = structfun(@gpuArray, s, 'UniformOutput', false);

The gpuArray function is indeed currently equivalent to a cudaMemcpy call.