A/L ICT

වැඩිම වෙසෙසි සංඛ්‍යාංකය - MSD
The most significant digit is the leftmost, non-zero digit in a number. It is the digit with the greatest value in the number.  in 2006.345 MSD is 2

අඩුම වෙසෙසි සංඛ්‍යාංකය - LSD
The least significant digit is the lowest digit in a number, located at the far right of a string. For example, in the number 2006, the "6" is the least significant digit.

Von Neumann architecture.

Introduced by John von Neumann
Parallel computers are referred as non-von Neumann architectures.

• Comprised of four main components:
  • Memory
  • Control Unit
  • Arithmetic Logic Unit
  • Input/Output
• Read/write, random access memory is used to store both program instructions and data
  • Program instructions are coded data which tell the computer to do something
  • Data is simply information to be used by the program
• Control unit fetches instructions/data from memory, decodes the instructions and then sequentially coordinates operations to accomplish the programmed task.
• Aritmetic Unit performs basic arithmetic operations
• Input/Output is the interface to the human operator
  
  https://computing.llnl.gov/tutorials/parallel_comp/#Neumann

Parallel computers

multi-processor computer architectures
Instruction and Data.  x Single or Multiple.
Single Instruction Single Data (SISD)
Single Instruction Multiple Data (SIMD)
Multiple Instruction Single Data (SIMD)
Multiple Instruction Multiple Data MIMD)