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Please read the general instructions for this exercise first. Here are the additional instructions specific to this task:
Implement a simple baseline solution for the GPU. Make sure it works correctly and that it is reasonably efficient. Make sure that all performance-critical parts are executed on the GPU; you can do some lightweight preprocessing and postprocessing also on the CPU. Remember to check all CUDA operations for errors. In this task, you are permitted to use single-precision floating point numbers.
I will first run all kinds of tests to see that your code works correctly. You can try it out locally by running ./grading test, but please note that your code has to compile and work correctly not only on your own computer but also on our machines.
If all is fine, I will run the benchmarks. You can try it out on your own computer by running ./grading benchmark, but of course the precise running time on your own computer might be different from the performance on our grading hardware.
| Name | Parameters |
|---|---|
| benchmarks/1a | nx = 1000, ny = 1000 |
| the input contains 1000 × 1000 pixels, and the output should contain 1000 × 1000 pixels | |
| benchmarks/1b | nx = 999, ny = 999 |
| the input contains 999 × 999 pixels, and the output should contain 999 × 999 pixels | |
| benchmarks/1c | nx = 1001, ny = 1001 |
| the input contains 1001 × 1001 pixels, and the output should contain 1001 × 1001 pixels | |
| benchmarks/2a | nx = 1000, ny = 4000 |
| the input contains 4000 × 1000 pixels, and the output should contain 4000 × 4000 pixels | |
| benchmarks/2b | nx = 1000, ny = 4000 |
| the input contains 4000 × 1000 pixels, and the output should contain 4000 × 4000 pixels | |
In this task your submission will be graded using benchmarks/2b: the input contains 4000 × 1000 pixels, and the output should contain 4000 × 4000 pixels.
The point thresholds are as follows. If you submit your solution no later than on Saturday, 31 August 2024, at 23:59:59 (Helsinki), your score will be:
| Running time | Points |
|---|---|
| ≤ 5.000 sec | 1 |
| ≤ 3.000 sec | 2 |
| ≤ 2.000 sec | 3 |
| ≤ 1.000 sec | 4 |
| ≤ 0.500 sec | 5 |
For late submissions you will not get any points.