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HPC OpenMP assignment Group 7

Authors

Francesco Malferrari (193103), Gianluca Siligardi (185068) and Andrea Somenzi (232254)

Description

This is the exam project for UniMORE High Performance Computing course. The goal is to minimize the execution time of the DynProg solver of the Polybench C library through:

  • Profiling and bottleneck research
  • Code rewriting
  • Parallelization with
    • OpenMP
    • CUDA

Folders in the repository

  • /dynprog : original version of the file assigned
  • /fast_dynprog : the fastest version of the written dynprog. It has been uploaded for completeness, however it has an error due to the precision of floating point type.
  • /OpenMP
  • /Cuda

OpenMP folder

This folder contains the sources of the first assignment:

  • the rewritten DynProg rew_dynprog.c in /rew_dynprog
  • the OpenMP parallelization of the rewritten DynProg parallel_dynprog.c in /parallel_dynprog
  • the OpenMP parallelization over Nvidia Jetson Nano GPU of the rewritten DynProg gpu_dynprog.c in /gpu_dynprog

Visuals

/OpenMP folder contains also the presentation of the results of the first assignment.

Cuda folder

This folder contains the sources of the second assignment:

  • Makefile: the Makefile for .cu files
  • cuda_dynprog.cu: the CUDA optimization of the rewritten version of dynprog.c

Visuals

/Cuda folder contains also the presentation of the results of the second assignment.

How to compile

Into each directory run this command:

make EXT_CFLAGS="-DPOLYBENCH_TIME -DPOLYBENCH_DUMP_ARRAYS" clean all run

You can also specify the dataset size adding the flag DATASET and writing one of the listed in the header file /dynprog/dynprog.h, for example:

make EXT_CFLAGS="-DLARGE_DATASET -DPOLYBENCH_TIME -DPOLYBENCH_DUMP_ARRAYS" clean all run

Alternatively, if you want to use datasets not present in the header file, you can replace the flag DATASET whith the following flags setted with numbers of your interest:

-DLENGTH=10000 -DTSTEPS=20

It is also possible to specify the number of threads with the following flag:

"-DNTHREADS=4"

but in our case having a four threads machine, it was defined in the code.

Before running these commands, to compile gpu_dynprog.c, you must run

module load clang/11.0.0 cuda/10.0

to load the cuda library.