In a winter morning one man shovels the snow from his driveway. When the job is finished he can get out with the car. In the neighbouring driveway p men remove the same amount of snow in one p-th of time. The next morning is snowy. As the single shoveler goes on, new snow falls making his job harder. The neighbouring shovelers work for a shorter time, and a smaller amount of snow falls meanwhile, so that they clean the driveway in less than one p-th of time. This seems to conflict with a folklore theorem on parallel speed-up.
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The p-shovelers problem: (computing with time-varying data)
Luccio, Fabrizio; Pagli, Linda
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, Volume 23 (2)
Association for Computing Machinery – May 1, 1992
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