In-place operation at gpuarray

I'm using Matlab 2015b on Ubuntu 14.04

I'm unable to perform inplace operations on gpuarray even when both left & right hand variables are the same.

For example:

    gpA = ones (N,M,'single','gpuarray');
    S = 5;

   gpA = gpA.*S;
   gpA = abs (gpA);

If N & M are big enough so gpA occupies more than half of the GPU memory, the above operations results in out of memory exception.

How do I perform simple inplace operations without writing a proprietary kernel?

Thanks in advance, David

Answer 1

[Joss Knight]

Do it inside a function. On the command line MATLAB cannot operate on the arguments to functions in-place, because (to cite one of the reasons) if a function errors or the user hits Ctrl-C it needs to be able to return your workspace to the state it was in before you ran the function, not some half-completed state.