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Dear all, We are trying to run a very heavy model, non-linear analysis (slide contact + pretension) and quite a lot of elements. It keeps giving us an error of not enough memory for the mumps solver. We are running on a machine with 4 cores and 64 Gb Ram. We tried all the options, (core in, core out, fixlen, len, etc..) but same error! Is there a way to tell optistruct to use all the available ram and then use the hard drive for the rest? Or do you now of a better way to avoid this error message, and let the simulation run, even if it is going to do few days to run? Many thanks in advance for any response and for your help and valuable time.