Open fact_rcrs.zip and look at the code.

Try to run the script while passing 1000 as a command line argument. Why does it crash?

Luckily, python allows you to both retrieve the current recursion limit and set a new value for it. Increase the recursion limit so that the process will never crash, regardless of input (assume that it still has a reasonable upper bound).

Run the script again, this time passing 10000. Use mpstat to monitor the load on each individual CPU at 1s intervals. The one with close to 100% load will be the one running our script. Note that the process might be passed around from one core to another.

Stop the process. Use stress to create N-1 CPU workers, where N is the number of cores on your system. Use taskset to set the CPU affinity of the N-1 workers and then run the script again. You should notice that the process is scheduled on cpu0.