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Is Parallel Programming Hard, And, If So, What Can You Do About It? (new June 2023 release)
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Yep. I remember parallelising emarrasingly parallel C++ code once. I had an array for the results of each job, but forgot to give each job their own index in the array. So everyone wrote their results to the zeroeth entry in parallel. It was cache efficient this way, but the result was not what I expected.