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AI Challenge Forums • View topic - Weird Scheduling

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Weird Scheduling

Ideas for the Future

Weird Scheduling

Postby dimkadimon » Fri Dec 16, 2011 6:55 am

It seems that Dr.EyeBrows has played a whopping 23 games in 14 minutes between December 16th 6:21am and 6:35am! But hasn't played for 24 hours before that. Looks like something is wrong with the gamer scheduler.
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Re: Weird Scheduling

Postby gerg.bowering » Fri Dec 16, 2011 11:34 am

I'm guessing there's a race condition between how the servers match bots.
Many of those 14 games may have been running concurrently on 14 of the 18 available servers.
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Re: Weird Scheduling

Postby dimkadimon » Fri Dec 16, 2011 1:37 pm

dimkadimon
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Re: Weird Scheduling

Postby Janzert » Fri Dec 16, 2011 6:50 pm

This is basically an interaction between the way pairing tries to keep the games spread out among players fairly evenly in a 24 hour time period and being deactivated for a long period of time. Eventually a deactivated bot, that is otherwise attractive to the pairing algorithm, will have all their games for the day bunched up in a short time period each day. In this specific case he has been deactivated for over a month. It certainly looks rather weird but isn't too harmful. If there was more time left in the competition I'd probably try to fix it.
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Re: Weird Scheduling

Postby Scryer » Fri Dec 16, 2011 6:58 pm

It's emergent behavior in the scheduling algorithm. Bots with low sigmas are considered by the scheduler as being useful for bracketing the true skill estimate, and after 24 hours or so they become ripe for scheduling again. Mid-range bots that have been deactivated for a long time will have a low sigma. Let's guess the cutoff is 16 games per 24 hours, and let's further assume that means "finished" games. It could have finished 15 of them and queued up the rest you saw before the other server-farm-full of them had completed. (This is a near-total guess, slightly informed by sleep-fuzzed partial recollections from janzert's clear explanations on IRC when I whinged about the deactivated bot named "virus" getting 12 matches after its match with me while I got bugger-all.)

I think of it as being rather like a bank. If you need money you can't get a loan because you don't have any collateral, but if you have a million isk and don't need any more they'll blithely loan you another million isk to stack on top of it.

<oops, overlapped with the real answer.>
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