Cap the number of parallel threads for GEMM;GETRF and POTRF to ensure sensible workloads on big systems #4585
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probably fixes #1881 and also fixes #678 as well as it fixes #611 - the idea here is to obtain a maximum thread count that ensures each thread gets about the same workload as a single thread would (before the switchover to multithreading occurs), instead of always starting as many threads as possible.