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63 lines
2.8 KiB
Markdown
63 lines
2.8 KiB
Markdown
\[ **Stefano Pigozzi** + **Caterina Gazzotti** + **Fabio Zanichelli** | Topic OpenMP | High Performance Computing Laboratory | Unimore \]
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# C code optimization using NVIDIA CUDA
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> ### Assignment #2
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>
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> Every team is called to optimize (parallellize) the execution time of the assigned applications on multi-processor system.
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>
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> #### Expected outcomes
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>
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> * Repository of the code (github/gitlab is ok, or .zip )
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> * Oral presentation (5 min + 5 min Q&A) of your work
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>
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> #### Assigned application
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>
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> Group 3: `OpenMP/linear-algebra/kernels/atax`
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## Developed features
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* [Workaround for unavailable `M_PI`](https://github.com/Steffo99/unimore-hpc-1/blob/bffa0502393d97e7cda4ac34c57dd9c3ac9ac9dc/OpenMP/linear-algebra/kernels/atax/atax.c#L13-L18)
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* [Enabled `POLYBENCH_TIME` by default](https://github.com/Steffo99/unimore-hpc-1/blob/bffa0502393d97e7cda4ac34c57dd9c3ac9ac9dc/OpenMP/linear-algebra/kernels/atax/Makefile#L4-L5)
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* [Enabled extra warnings by default](https://github.com/Steffo99/unimore-hpc-1/blob/bffa0502393d97e7cda4ac34c57dd9c3ac9ac9dc/OpenMP/linear-algebra/kernels/atax/Makefile#L6-L8)
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* [Applied the maximum level of compiler optimizations](https://github.com/Steffo99/unimore-hpc-1/blob/bffa0502393d97e7cda4ac34c57dd9c3ac9ac9dc/OpenMP/linear-algebra/kernels/atax/Makefile#L9-L10)
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* [Replaced `tmp` array with a iteration-local variable](https://github.com/Steffo99/unimore-hpc-1/commit/7fc2506cc7c6743288a56047cbb44e960abec4fc)
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* [Allowed the addition of `CFLAGS` from `make` calls](https://github.com/Steffo99/unimore-hpc-1/blob/bffa0502393d97e7cda4ac34c57dd9c3ac9ac9dc/OpenMP/linear-algebra/kernels/atax/Makefile#L13-L14)
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* [Disabled `make` output](https://github.com/Steffo99/unimore-hpc-1/commit/f655df0eb7e539b06965de7c79dbc1c7bc6a5950)
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* [Created `make bench` target to run](https://github.com/Steffo99/unimore-hpc-1/blob/bffa0502393d97e7cda4ac34c57dd9c3ac9ac9dc/OpenMP/linear-algebra/kernels/atax/Makefile#L20-L23) [a script performing multiple parametrized tests on the code to determine the best optimizations](https://github.com/Steffo99/unimore-hpc-1/blob/master/OpenMP/linear-algebra/kernels/atax/.bench.sh)
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* [Moved `polybench_start_instruments` to include the `init_array` function](https://github.com/Steffo99/unimore-hpc-1/commit/0ba75336e60b1cf149684a5f259fa933a36e2c5c)
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## Results
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TBD
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### Validation
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* Compiler used: **nvcc**
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* Jetson Nano used: `8`
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To reproduce the obtained results:
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1. Clone the repository on a Jetson Nano:
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```console
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$ git clone https://github.com/Steffo99/unimore-hpc-assignments
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```
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2. Checkout the exact commit the tests were executed on:
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```console
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$ git checkout TBD
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```
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3. Access our group's assigned folder:
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```console
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$ cd unimore-hpc-assignments/atax
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```
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4. Run the benchmarking script:
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```console
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$ make bench
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```
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