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Parallel processing isn’t just for supercomputers or GPUs anymore. Computer makers are throwing multiple cores at everything from servers to your printer. But the focus on horsepower misses a crucial problem associated with adding more processors. To really take advantage of them, you have to rewrite your code.As anyone who’s ever hosted a demolition party well knows, you can only throw so many workers at a problem before people start to linger at the edges, swill your alcohol and generally stop helping. You need not just manpower, but a good way to organize those workers so that someone, says, preps a drop cloth before your walls get taken out. And others prep for cleanup while the plaster is flying.