Author: Robert Hyatt
Date: 14:39:22 11/15/02
Go up one level in this thread
On November 15, 2002 at 12:15:18, Gian-Carlo Pascutto wrote: >On November 15, 2002 at 12:10:44, Francesco Di Tolla wrote: > >>"Hyper- Threading Technology, which was pioneered on Intel's advanced server >>processors, helps your PC work more efficiently by maximizing processor >>resources and enabling a single processor to run two separate threads of >>software simultaneously" >> >>I don't get the point: any modern cpu runs as many threads as it wants >>simultaneously doing "context switching". >> >>Does this mean that in a Pentium two threads run at the same time in the CPU? >>Then one would have "two CPU in one". > >That's the idea... > >But in practise it's more like 'one and a half CPU's in one' or even less :) > >-- >GCP I think the only way this will look like "two cpus" is a special case... one "thread" that fits into the trace cache (decoded micro-ops)." The other that does a fair bit of memory accessing. The one that fits in the trace cache will run at full-speed while the other will run at whatever speed memory bandwidth will allow... For chess, that isn't likely going to happen, although as the trace cache idea grows and it gets larger, this might happen...
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