Good catch. I had forgotten that.

I did some more tests with 4 queues and found that there seemed to be
some contention going on that prevented all cores from being utilized
fully.
With the example provided 2 cores will pin at 100% (excellent). With 4
atoms and one test fn one core will stay around 20%, no other core >
70%.
When I used 4 separate worker fns along with 4 separate atoms things
improved and all 4 cores pinned at around 60%. It would be interesting
to know why having 4 separate fns makes a difference (STM?).

Wrt 60%: I simply think this was an artifact of my test. If I had
spawned another thread to feed another atom I'm sure I could have
easily pegged all CPUs to 100%.


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