MATLAB API to CUDA-C Implementation of SEBS on GPU is now ready


Quite recently I announced that the SEBS algorithm, developed by Prof. Bob Su, is implemented on GPU using CUDA-C. Harnessing the many computational cores available on graphical processing units (GPUs) increases the performance of the SEBS algorithm in the total computational time needed to do the calculation. Our tests shows that one can achieve a speed up of up to 200 times on C1060 NVIDIA Tesla card. This is indeed a lot of speedup.

However, more important than the time needed to calculate is how easy it is to use a software or a computer code. I have provided the entire C code which reads the data, calculates everything, and stores the output in NetCDF files; however, I noticed that many researchers and scientists are not willing to get involve with C code. Their concerns is quite valid and I can understand it. C language is not that easy to use, particularly if your focus is not programming. It is much easier to use MATLAB or other software to process, and prepare the input files, and plot the results.

Therefore, I decided to provide a MATLAB API to the CUDA-C implementation of SEBS on GPUs. Every thing related to preparing the GPU and using GPU on MATLAB is handled by these APIs and the user do not need to worry about anything regarding the GPU. The user does not even  need to know how to program on GPU using MATLAB.

To use the MATLAB API to CUDA-C implementation of SEBS on GPU you need to have (1) MATLAB (of course), (2) Parallel Toolbox of MATLAB installed, and (3) a GPU card that MATLAB supports. For more information you can refer to:

http://www.mathworks.nl/help/toolbox/distcomp/

There are 4 functions in total:

  • SEBSGPU_WORLD=InitSEBSGPU_WORLD(): This function does not require any input. It will reads the CUDA-C PTX files, prepares the GPU computing Kernels and some other required information needed to run codes on GPU using MATLAB. That’s all you need to do. Everything is handled in the that function.
  • SEBS_kb_1: This function receives some input and then computes d0,z0h, and z0m. You do not need to worry about the memory transfer between the host and the GPU device. Everything is handled by the function.
  • SEBS_EnergyBalance: The same as above, but calculates the instantaneous values for evapotranspiration and some other outputs.
  • SEBS_Daily_Evapotranspiration: performs daily calculation of ET.

all the inputs are automatically transfered to your graphic card and the calculation is done. Once the GPU is done with the calculation, the results are transfered back to PC and to a regular MATLAB variable that you already know how to deal with.

Every details related to GPU is hidden from the user.

Hope you will enjoy the MATLAB API to CUDA-C implementation of SEBS on GPU.

for more information refer to here.

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