How to check the Bytes of gpuArray?

Question

wei zhang 2021-2-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/745482-how-to-check-the-bytes-of-gpuarray

回答： Matt J 2021-3-1

Hi,

I am confusing in checking the Bytes of gpuArrays. It seems every varaible's Bytes is 4. Could I do something more to set it well? Or it is a windows or Geforce problem that I could not check it correctly?

x= 1:5;
xg = gpuArray(x);
xg32 = gpuArray(int32(x));
whos xg
%   Name      Size            Bytes  Class       Attributes
%   xg        1x5                 4  gpuArray 
whos xg32
%  Name      Size            Bytes  Class       Attributes
%  xg32      1x5                 4  gpuArray  

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Answer 1

Edric Ellis 2021-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/745482-how-to-check-the-bytes-of-gpuarray#answer_623702

Unfortunately, whos does not currently report the number of bytes used by a gpuArray on the GPU - the 4 bytes you see reported is the amount of CPU memory consumed. The number of bytes used by a gpuArray is essentially the same as the number of bytes used by the corresponding CPU array. (The only time this is not the case is for a non-square sparse gpuArray - the different sparse layouts makes a difference).