You need to log in to make submissions.
Please read the general instructions for this exercise first. Here are the additional instructions specific to this task:
This is a version of CP3a which has extended, experimental benchmarks that also try to measure cache traffic. This is a somewhat tricky endevour, as the exact meaning of cache performance events can be CPU specific. We would therefore like to hear your feedback on how this works on your local system, as well as any cases where the reported numbers seem to differ from your expectations.
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 | Operations | Parameters |
|---|---|---|
| benchmarks/1 | 1,004,000,000 | nx = 1000, ny = 1000 |
| the input contains 1000 × 1000 pixels, and the output should contain 1000 × 1000 pixels | ||
| benchmarks/2a | 16,016,000,000 | nx = 1000, ny = 4000 |
| the input contains 4000 × 1000 pixels, and the output should contain 4000 × 4000 pixels | ||
| benchmarks/2b | 16,016,000,000 | nx = 1000, ny = 4000 |
| the input contains 4000 × 1000 pixels, and the output should contain 4000 × 4000 pixels | ||
| benchmarks/2c | 15,991,989,003 | nx = 999, ny = 3999 |
| the input contains 3999 × 999 pixels, and the output should contain 3999 × 3999 pixels | ||
| benchmarks/2d | 16,040,029,005 | nx = 1001, ny = 4001 |
| the input contains 4001 × 1001 pixels, and the output should contain 4001 × 4001 pixels | ||
| benchmarks/3 | 216,144,000,000 | nx = 6000, ny = 6000 |
| the input contains 6000 × 6000 pixels, and the output should contain 6000 × 6000 pixels | ||
| benchmarks/4 | 729,324,000,000 | nx = 9000, ny = 9000 |
| the input contains 9000 × 9000 pixels, and the output should contain 9000 × 9000 pixels | ||
Here “operations” is our rough estimate of how many useful arithmetic operations you will at least need to perform in this benchmark, but of course this will depend on exactly what kind of an algorithm you are using.
In this task your submission will be graded using benchmarks/4: the input contains 9000 × 9000 pixels, and the output should contain 9000 × 9000 pixels.
There are no points available for submissions to this task, but you can freely use this task for experimentation.