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What about testing with good and (purposely) bad implementations of number theory functions? The bad implementation tests your cluster, the good gives you a fast, modifiable answer. For example, PowerMod is faster than Mod. ParallelSum[Mod[3749111187234987^n, 743], {n, 1, 10000}]] ParallelSum[PowerMod[3749111187234987, n, 743], {n, 1, 10000}] but becomes ...

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