File structure

• The original unchanged source code can be found in folder cuda/gaussian
• Our various modifications can be found in folder impGaussian
• Example inputs can be found under data/gaussian

Prerequisites

In the file common/make.config modify the field CUDA_DIR to your CUDA toolkit installation path.

How to compile and run

Original source code

• Compile with: cd cuda/gaussian && make && cd ../..
• Example execution: ./cuda/gaussian/gaussian -f data/gaussian/matrix4096.txt -q
• To get all the different launch options run the program without any arguments

Modified code

• In impGaussian/Makefile modify the SRC field to the file you want to execute.
  • gaussianFinal_Backsub.cu includes kernel optimizations + new Backsub function (preselected)
  • gaussianFinal.cu includes only kernel optimizations
  • cuSolver.cu for solution using cuSolver
• Compile with cd impGaussian && make && cd ..
• Example execution: impGaussian/gaussian -f data/gaussian/matrix4096.txt -q
• To get all the different launch options run the program without any arguments (same as original source code)

Note: cuSolver.cu is a special case only has one launch option ./gaussian [inputFile] with no flags

Comparison and validation

• In impGaussian/Makefile modify the SRC field to the program's result you want to compare with the original
• Run: ./compileAndCompareOnlyRes.sh [sizeOfInput]
  • Replace [sizeOfInput] with the matrix size you want to use to compare with, supported sizes 4,16,1024,4096
• If both programs give the same result the only difference shown should be their execution times

Note: cuSolver.cu is special case, comparison is done to the correct answer when executing the program normaly. Largest error/difference is given. Run with: impGaussian/gaussian data/gaussian/matrix4096.txt after compiling either with makefile or manually.