Solved? Re: System no longer distributes load to multiple cores for long running task

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?