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I sometimes share my DRC/LVS scripts between several computers. The number of thread to run in hierarchical mode is defined by threads(n).
How to define threads(all) to use all the threads of the computer ?
Well, I'd just use a high number like 16, provided your machine doesn't have more than 16 CPUs
But frankly, multicore utilization is only good in tiled mode. Deep mode doesn't really benefit from parallelization as of now