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Please read the general instructions for this exercise first. Here are the additional instructions specific to this task:
Implement an efficient parallel sorting algorithm for the CPU, using the basic idea of merge sort.
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/1 | n = 100000 |
| the input contains 100000 integers, and the output should contain the same integers in order | |
| benchmarks/2 | n = 1000000 |
| the input contains 1000000 integers, and the output should contain the same integers in order | |
| benchmarks/3a | n = 10000000 |
| the input contains 10000000 integers, and the output should contain the same integers in order | |
| benchmarks/3b | n = 10000000 |
| the input contains 10000000 integers, and the output should contain the same integers in order | |
| benchmarks/3c | n = 9999997 |
| the input contains 9999997 integers, and the output should contain the same integers in order | |
| benchmarks/3d | n = 9999998 |
| the input contains 9999998 integers, and the output should contain the same integers in order | |
| benchmarks/3e | n = 9999999 |
| the input contains 9999999 integers, and the output should contain the same integers in order | |
| benchmarks/3f | n = 10000001 |
| the input contains 10000001 integers, and the output should contain the same integers in order | |
| benchmarks/3g | n = 10000002 |
| the input contains 10000002 integers, and the output should contain the same integers in order | |
| benchmarks/3h | n = 10000003 |
| the input contains 10000003 integers, and the output should contain the same integers in order | |
| benchmarks/4 | n = 100000000 |
| the input contains 100000000 integers, and the output should contain the same integers in order | |
In this task your submission will be graded using benchmarks/4: the input contains 100000000 integers, and the output should contain the same integers in order.
The point thresholds are as follows. If you submit your solution no later than on Sunday, 19 May 2024, at 23:59:59 (Helsinki), your score will be:
| Running time | Points |
|---|---|
| ≤ 3.500 sec | 1 |
| ≤ 2.500 sec | 2 |
| ≤ 1.500 sec | 3 |
| ≤ 1.200 sec | 4 |
| ≤ 1.000 sec | 5 |
If you submit your solution after the deadline, but before the course ends on Sunday, 02 June 2024, at 23:59:59 (Helsinki), your score will be:
| Running time | Points |
|---|---|
| ≤ 2.500 sec | 1 |
| ≤ 1.500 sec | 2 |
| ≤ 1.000 sec | 3 |
Your submissions to this task will also automatically take part in the contest, and you can receive up to 2 additional points if your code is among the fastest solutions this year!
| Running time | Extra points |
|---|---|
| ≤ 1.20 × fastest | 1 |
| ≤ 1.10 × fastest | 2 |