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What is SMP ? How does it relate to Dual cores ?

post #1 of 4
Thread Starter 
What is SMP (Symetrical Multi Processing)

SMP is a system with 2 or more processors (OR cores) equiped with an operating system that distributes the load across these processors as evenly as possibly.

Does that mean 1 processor will run the os and 1 will run my game ?

No the Operating system sends threads as soon as there is room to whatever processor is ready .

Is two 1 gig processors faster than one 1 gig processor If all other hardware is equal ?

No because of the added overhead of busses and because the operating system always distributes the load as evenly as possible across the 2 processors.Example if a game uses 50% of a single processor to run and you play the game on a dual the game will use 25% of each processor to run resulting in the same 50% load that we have in a single.Now add the bus for the dual and you are slightly slower in a game.
( This has changed,X2 Systems actually game the same as a single core because the busses needed to share info are ON DIE)

So if it is not faster why even have a dual system.
{It has been said a dual owner never goes back ! here is why.}

Lets encode a video on a 1 gig single with exactly the same hardware as a dual 1 gig.On the single you will see processor usage at 100% durring the video encoding process.Now Try to open Outlook express Or play a game.

On the dual run the same Video encoding and you will see each processor at 50% which is equal to the single at 100%.Now open Outlook express,Play a game,and fold and the dual happly responds.

The advantage will always be dual core or 2cpu when a user runs more then 1 app at a time,by app I dont mean several internet Explorer windows I mean programs that require CPU processing time. . .
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post #2 of 4
How do you make WinXP recognize that it has 2 cores to work with?
post #3 of 4
I think the nt kernel xp was based on has always recognized smp/dual procs/ then ht/ now dual core since its begining, because it was targeted @ workstations and servers.
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post #4 of 4
Thread Starter 
Quote:
Originally Posted by deathdispenser
I think the nt kernel xp was based on has always recognized smp/dual procs/ then ht/ now dual core since its begining, because it was targeted @ workstations and servers.

Yep,,And even XP home will see dual cores because it is a single socket,BUT will not work with 2cpu . .
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