[PD] Hyper-Threading on PD

Robert Scott lists at riscott.ukfsn.org
Mon May 29 17:08:54 CEST 2006

On Monday 29 May 2006 09:36, Tim Blechmann wrote:
> hyperthreading limits the cpu utilization by simulating two processors
> with 50% of the speed of the whole cpu.
> it is very unlikely that the gui process takes as much cpu as the pd
> process. so in a not very unlikely case, one virtual processor, running
> the main pd process, will have a utilization of 100%, while the other
> virtual processor is more or less sleeping ...

This is not true. A single thread is allowed to use the full power of the CPU. 
It's just that if/when it gets pipeline stalled, misses cache etc., another 
thread can use up its 'wasted' cycles/execution units.

HT can though slow a system down because of various pipeline wierdnesses and 
an operating system's SMP code not being up to scratch.



More information about the Pd-list mailing list