Re: HT (Hyper Threading) on CentOS 5.5

[John R Pierce <pierce@xxxxxxxxxxxx>]

On 03/09/12 12:32 AM, Kaushal Shriyan wrote:
> Not sure i understand about your earlier comment regarding pure floating
> point compute, help me understand with some examples.

mostly, numerical scientific processing, and various sorts of multimedia 
work, such as batch converting HDTV video formats, 3D animation 
rendering, etc.

most architectures, there's only one FPU (floating point unit) per 
core...  hyperthreading causes each core to act like two cores, which 
works great for integer, character, network, etc sorts of processing, 
but if the two threads are both trying to do steady floating point or 
MMX/SSE style processing, they have to share the same hardware and run 
slower.



-- 
john r pierce                            N 37, W 122
santa cruz ca                         mid-left coast

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