Author: Peter Stayne
Date: 23:46:17 07/07/03
Go up one level in this thread
Comanche 4 is not multithreaded. On July 08, 2003 at 01:38:09, Tom Kerrigan wrote: >On July 07, 2003 at 22:42:51, Peter Stayne wrote: > >>Upon further reading, my assumption is incorrect, but the findings of >>single-threaded apps getting a boost still seems to be true. Hence the three >>links below and choice quotes: >> >>http://www6.tomshardware.com/cpu/20021114/p4_306ht-12.html >> >>http://www.anandtech.com/cpu/showdoc.html?i=1746&p=6 >> >>On which I quote: >> >>Fundamentally we still only have one CPU and one set of execution units, so if >>the OS dispatches two threads that contend for identical resources in the CPU >>then HT could reduce performance. >> >>In the earlier versions of Hyper-Threading, there were some pretty significant >>performance drops in desktop applications with it enabled. Luckily through >>revision after revision of the technology and through the addition of a few new >>components (flip back a few pages to see what's new) the vast majority of >>applications will see a performance increase or no performance loss at all > >Right, the multithreaded apps will see an increase and the single threaded apps >will see no performance loss. The benchmarks agree. > >>http://www.aceshardware.com/read.jsp?id=50000332 >> >>Quote: >> >>It is quite remarkable how almost every single threaded benchmark still got a >>small performance boost from HyperThreading, between 1 and 5%. This shows that >>HyperThreading has matured as it almost never decreased performance, as it did >>in the first hyperthreaded Xeons. > >I don't see why Johan is saying this--all they tested was multitasking >situations, multithreaded apps, and some games, and the only game that showed >any statistically significant increase in performance, it wasn't clear if it was >multithreaded or not. (My guess is, it was.) > >-Tom
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.