System no longer distributes load to multiple cores for long running task

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Hi,

It's been a while (6 months?) since I ran a python program that uses a
100% cpu core for hours.  The last time I ran it, the task would migrate
from core to core to core, every second or so.  I could see it doing so
in the various tops.

Now, it runs on only one core, and doesn't move.

This is more efficient from a computing perspective because there
aren't as many task switches, but it means that the core that is
running gets very hot.  Since the rest of the cores are idle, I would
like to switch back to the previous behavior for this reason.  Can
someone tell me how?

Thanks.

PS I'm copying devel in case this isn't a kernel issue, and also
because my posts to the kernel list just seem to disappear into the
ether.
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