Humongous Multiplier

Multiplication of two 1-million digit numbers, exploring the usage of multi-threading

Names of Input Files-

• input1.txt
• input2.txt

Output File names-

• single_multiplied.txt
• multithreaded_multiplied.txt

Some Details for Input and Output files for Results are also provided in description.txt file.

Instructions for use:

1. Clone the url, or download as a zip folder and extract it
2. Then open the terminal (linux/mac) or command prompt (windows)
3. Go to the directory (using cd command) to the cloned directory (or the extracted folder)
4. Compile the c programs:
   • gcc prog1.c -o prog1.out
   • gcc prog2.c -o prog2.out -lpthread
5. Run the timeit shell file from the terminal using the below command:
   • ./timeit.sh

Error Checking:

    If the thread count less than 0 and greater than 100. Provide Default thread count to 8

Results and Conclusions:

    The code was tested on different files from 1 digit to 1 million digits multiplication.
    For example for multiplication of A (10^5 digit number) X B(10^5 digit number) took time of 900 seconds in single thread and in multi threading it took approximately 820 seconds.
    In another example run, multiplication of A (10^6 digit number) X B(10^6 digit number) took time of 2 hours 27 minutes in single thread and with multi threading it took aapproximately 2 hours 23 minutes.
    Hardware specifications of the machine on which the testing was done by the creator of the code:
            CPU: Intel© Core™ i5-4210U CPU @ 1.70GHz × 2 (Dual core)
            Memory: 3.8 GB
            Hard Drive: 973.3 GB
            Operating System: Linux Mint 19.1 Cinnamon