Litt om hvordan dual core funker i praksis

[Betroz]

Fant sitatet på XtremeSystems :

Windows will allocate the cores equally among threads with the same priority. If one app has a higher process priority class and is running two threads at full load that app will take up most of the time and other apps will not get much processing time.

 

If two apps are running with the same priority both apps will get equal time on the cores.

 

If one app is running 1 thread another app is running 1 thread and a third app is running 2 threads, the third app will get 50% of the processing power while the other two will have to split the other 50% of power.

 

Generally calculation work should be done on a low priority thread so the gui will get more processing time and keep the computer experience fast, but most apps will calculate demanding things like video encoding with normal priority, and can thus make the experince laggy.

 

Two cores help with this problem, because there is less chance that two demanding caclulations are done at the same time, but if you start a lot of programs that does anything mayor (like rendering a movie or batching a job) your computer will become slow like a single core again.

 

Generally if you don't do anything with the programs you have running they don't take up any processing time, so just having 7 programs started will not slow you down.

[Betroz]

Så hvis man virkelig trenger god multitasking ytelse, så vil quad core (4 CPU'er) hjelpe en god del. Så kan godt skjønne at 2 stk dual core Opteron er raske saker i slike sammenhenger ja! Kan også skjønne hvorfor Intel Extreme Edition 840 gjorde det så bra i den stress testen hos THG siden den har HT i tillegg til de to kjernene.