Counting Python threads vs C/C++ threads

[Peter J. Holzer]

On 2019-07-16 12:48:33 -0700, Dan Stromberg wrote:
> On Tue, Jul 16, 2019 at 11:13 AM Barry Scott <barry at barrys-emacs.org> wrote:
> > Does top show the process using 100% CPU?
> >
> Nope.  CPU utilization and disk use are both low.
> 
> We've been going into top, and then hitting '1' to see things broken down
> by CPU core (there are 32 of them, probably counting hyperthreads as
> different cores), but the CPU use is in the teens or so.

If you had many CPU-bound Python threads, then with 32 cores each core
might show as 3 % busy (the sum of the threads can't use more then 100 %
because of the GIL and 100 / 32 = 3.125).

        hp

-- 
   _  | Peter J. Holzer    | we build much bigger, better disasters now
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__/   | http://www.hjp.at/ | -- Ross Anderson <https://www.edge.org/>
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