In symmetric (or "tightly coupled") multiprocessing, the processors share memory and the I/O bus or data path. A single copy of the operating system is in charge of all the processors. SMP, also known as a "shared everything" system, does not usually exceed 16 processors.
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Short for Symmetric Multiprocessing, a computer architecture that provides fast performance by making multiple CPUs available to complete individual processes simultaneously (multiprocessing). Unlike asymmetrical processing, any idle processor can be assigned any task, and additional CPUs can be added to improve performance and handle increased loads.
SMP uses a single operating system and shares common memory and disk input/output resources. Both UNIX and Windows NT support SMP.
Read full article from What is SMP (symmetric multiprocessing)? - Definition from WhatIs.com
http://www.webopedia.com/TERM/S/SMP.html
Short for Symmetric Multiprocessing, a computer architecture that provides fast performance by making multiple CPUs available to complete individual processes simultaneously (multiprocessing). Unlike asymmetrical processing, any idle processor can be assigned any task, and additional CPUs can be added to improve performance and handle increased loads.
SMP uses a single operating system and shares common memory and disk input/output resources. Both UNIX and Windows NT support SMP.
Read full article from What is SMP (symmetric multiprocessing)? - Definition from WhatIs.com