Overview

Optimized Parallel Tiled Approach to perform Matrix Multiplication by taking advantage of the lower latency, higher bandwidth shared memory within GPU thread blocks.

Execution

• Run "make" to build the executable of this file.
• For debugging, run "make dbg=1" to build a debuggable version of the executable binary.
• Run the binary using "./name-of-the-artifact"

There are several modes of operation for the application -

• No arguments: The application will create two randomly sized and ini- tialized matrices such that the matrix operation M * N is valid, and P is properly sized to hold the result. After the device multiplication is in- voked, it will compute the correct solution matrix using the CPU, and compare that solution with the device-computed solution. If it matches (within a certain tolerance), it will print out “Test PASSED” to the screen before exiting.

• One argument: The application will use the random initialization to cre- ate the input matrices, and write the device-computed output to the file specified by the argument.

• Three arguments: The application will read the input matrices from pro- vided files. The first argument should be a file containing three integers. The first, second, and third integers will be used as M.height, M.width and N.width respectively . The second and third arguments will be ex- pected to be files which have exactly enough entries to fill matrices M and N respectively. No output is written to file.

• Four arguments: The application will read its inputs from the files pro- vided by the first three arguments, as described above, and write its output to the file provided in the fourth.

Input File Format

The (optional) input files should have a single line containing whitespace- separated floating point numbers representing the matrix data. There should be m · n numbers on this line for a m × n matrix, where the first n numbers are the first row, the second n numbers are the second row, etc. For example, to represent the following matrix: [1 2 3] [4 5 6] [7 8 9] the corresonding input file should contain the following line (without quotes): “1 2 3 4 5 6 7 8 9”

If you wish to use the output file from one run of the application as an input in a later run, you must delete the first line in the output file, which displays the accuracy of the values within the file.