If you spawn 4 processes, each with one thread, you end up with 4
threads. To the hardware, it doesn't matter whether they are from the
same process or from different ones. These four threads will get
scheduled on the 4 (logical) cores that the OS sees, filling up your
machine completely.
-Wim
On 28/06/2012 17:22, Xavier Noria wrote:
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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