Test failing for no obvious reason

[m8pple]

I have noticed that one of my tests is failing for coursework 2. I tried investigating the problem, but I don't have any printf-s or std::cout's in my code, so I couldn't figure out the problem. I also double checked my register factories, makefile and class names to no avail.

I was just wondering if you could shed some light on this error.

[m8pple]

One of the defensive measures used in the tests is that if things take too long, then they are killed (using /usr/bin/timeout). The timeout is set long enough that any reasonable implementation should complete, but short enough that a few infinite loops don't cause the entire batch to take a whole day.

I don't think I put any logic in to print a specific message for timeouts, so that's my best guess for what's happening here. Test 34 should take <10 secs in most case, so the execution limit is set to 60 seconds. So I'd investigate:

• is the default value of K is actually a good value?
• Are you genuinely skipping ahead? std::pow is very expensive compared to a complex multiply, so if that is still in the inner loop it will be much slower.

[vinaymaniam]

Thank you for the detailed explanation!