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1. jcudeiro
   

   Member
   Joined: Oct '15
   Posts: 3

   Hi there!

   First of all, amazing software. Really nice job!

   Second of all, I am trying to use a GPU (NVIDIA GeForce 1080, with an Available Memory of: 7.0829e+09) to run a simulation in 3D (heterogeneous medium). My computational grid size is: 633 by 633 by 446 grid points and 23,745 time steps.

   When using kspaceFirstOrder3DG (datacast set to single or gpuArray-single) I get this error:
   Error: Not enough CPU or GPU memory to run this simulation.
   

   Error using h5readc
   Unable to open file. Filename may be corrupt or have unsupported characters.
   Error in h5read (line 58)
   [data,var_class] = h5readc(Filename,Dataset,start,count,stride)

   And with kspaceFirstOrder3D (datacast set to gpuArray-single) this one:
   

   Error using gpuArray
   Out of memory on device. To view more detail about available memory on the GPU, use 'gpuDevice()'. If the problem persists, reset the GPU
   by calling 'gpuDevice(1)'.
   
   Error in kspaceFirstOrder_dataCast (line 206)
   eval([cast_variables{cast_index} ' = ' data_cast '(' data_cast_prepend '(' cast_variables{cast_index} '));']);

   - Is there any way I can split the simulation to run it just with the GPU? (For smaller grids it works fine). Or between the GPU and CPU?

   - Is it possible to record the 'movie' when using kspaceFirstOrder3DG?

   Many thanks in advance!

   Posted 8 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi jcudeiro,

   The two function calls you mention run exclusively on the GPU. Unfortunately, the simulations are too big to fit in GPU memory as the error messages suggest. There is currently no way to split the simulation between CPU and GPU. We did experiment with just offloading the FFTs to the GPU, but the communication overhead meant that there wasn't any real performance benefit.

   There is no way to save a movie using the C++ or CUDA codes, as they don't have a graphical output.

   Hope that helps,

   Brad.

   Posted 8 years ago #

3. jcudeiro
   

   Member
   Joined: Oct '15
   Posts: 3

   Thank you very much Brad!

   Posted 8 years ago #

4. jcudeiro
   

   Member
   Joined: Oct '15
   Posts: 3

   When using the GPU, I create a temp file of 36GB. The computation finishes, but then I get this:

   Error using h5readc
   Requested 211x211x145x1439 (34.6GB) array exceeds maximum array size preference. Creation of arrays greater than this limit may take a long time and cause MATLAB to become unresponsive. See array size limit or preference panel for more information.

   Is there any way around this error?

   Many thanks in advance!

   Best,
   Javi

   Posted 7 years ago #

5. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi Javi,

   Nothing I can think of immediately. I guess try searching for how to alter MATLAB's maximum array size preference.

   Brad.

   Posted 7 years ago #

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