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Solver (601) gets slow after messege "switching from out of core to in core"




I am runing a sol601 analysis, on a 12 core machine with 64 GB memory (windows 7 64 bit and 64 bit FEMAP latest version).

For the first 75% of the analysis everything went right and the I got a messege in the Analysis monitor log saying "Switching fronm out of core to in core solver". At this stage the solver got very slow, and it uses much less system resources.

Two questions:


1. What does this messege means.

2. Why is it using so little system resources which makes the solution go very slow?