"Sun, Hui" <[email protected]> writes:

> Thank you Jed. I don't know how to use "lstopo" from the hwloc, 

A search engine will solve that problem.

> but I looked up the cores and memory from the hardware overview from
> my MAC, it has
>
> Number of Processors: 1
> Total Number of Cores:        2
>
> Besides, as you said, there are 4 logical cores due to hyperthreading. 
> However, I'm still expecting to get speed doubled because I have 2 real 
> cores. So where is the restriction then? 

Memory bandwidth, as stated in my email and the page I linked.

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