Ah, I was thinking more of a huge (infinite?) set of simulators, each running for some finite number of ticks. Then the subjective probability of being in program number n is related to the proportion of simulators that run program n for long enough to reach a feasible world for you to be in. So, sure, program A gets more ticks than B in the original scheduler, but I think the determining factor is how many simulators go on to run B at all.
Ooooooh. No, I guess the model we're using here (that is, the fanfic in question) is that somewhere down the levels there is a single simulator running a "program of all possible programs".
Although, I wonder if we can then just say the bottom level is Tegmark's Level 4 Multiverse and get rid of any actual machine or such at the lowest level. :)
So I'd intended this story as a bit of utterly deranged fun, but it got out of control and ended up as a deep philosophical exploration, and now those of you who care will have to wade through the insanity. I'm sorry. I just can't seem to help myself.
I know that writing crossover fanfiction is considered one of the lower levels to which an author can sink. Alas, I've always been a sucker for audacity, and I am the sort of person who couldn't resist trying to top the entire... but never mind, you can see for yourself.
Click on to read my latest story and first fanfiction, a Vernor Vinge x Greg Egan crackfic.