I run htop today in my new MacBook Air 11'', with two i7s (Ivy Bridge) and
realized it reports 4 CPUs.
People on Twitter pointed out to hyper-threading, and descriptions of that
technology focus on being able to run more *threads* on the same core.
For example, Intel says[*]:
"Intel® Hyper-Threading Technology (Intel® HT Technology)1 uses processor
resources more efficiently, enabling multiple threads to run on each core.
As a performance feature, Intel HT Technology also increases processor
throughput, improving overall performance on threaded software."
Therefore, I expected a single-threaded program that forks several
processes to saturate only two logical cores.
But all the logical cores get busy, see this video:
http://www.youtube.com/watch?v=R_HlNhGYVIQ
Note the gauges and the percents in the process list.
Can you help me interpret that?
Xavier
[*]
http://www.intel.com/content/www/us/en/architecture-and-technology/hyper-threading/hyper-threading-technology.html
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