Summary STUDY HARD

CS 405
COMPUTER SYSTEM ARCHITECTURE
MODULE-1 [PART-3]

Syllabus: Parallel computer models – Evolution of Computer Architecture,
System Attributes to performance, Amdahl's law for a fixed workload,
Multiprocessors and Multi computers, Multi vector and SIMD computers,
Architectural development tracks, Conditions of parallelism.




ARCHITECTURAL DEVELOFMENT TRACK


¡ Understanding features of various tracks provides insights tor new architectural
development.

¡ These tracks are distinguished by similarity in computational models and technological
bases.

 Multiple- processor tracks

 Multi vector and SIMD tracks

 Multithreaded and dataflow tracks



Multiple- processor tracks


A multiple-processor system can be either a shared-memory multiprocessor or a distributed-
memory multicomputer

 Shared memory tracks

 Message passing tracks



Shared memory tracks


Shared-memory shows a track of multiprocessor development employing a single address
space in the entire system.

, Message passing track




CONDITIONS OF PARALLELISM


 Computational model for parallel computing.
 Inter processor communication in parallel architectures.
 System integration incorporating parallel systems into general computing environments.




Data and Resource Dependence:


¡ The ability to execute several program segments in parallel requires each segment to be
independent of the other segments.

¡ We use a dependence graph to describe the relations. The nodes of a dependence graph
correspond to the program statements

¡ The directed edges with different labels show the ordered relations among the statements