Well, I've been running your code for about 6 hours or so on
the fastest machine I have and also on an Ubuntu machine.
Neither one has completed so far but they continue to compute.
As to the complete system crash my best guess is that your system
has "thermal checked", i.e., overheated and thus powered off.
My fast machine has all three fans running and is in a slight hover.
I am thinking you are right: I tried the same computations on another
machine: same distribution, same axiom version: it ran for more than 8
hours without problems, but, unluckly, not giving the answer... :-(
I remember that the temperature was about 60 degrees (Celsius) when it
crashed: I didn't think it was that much.
In any case, thank you for your attention.
Fabio
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