I solve a large MILP with Gurobi. It takes about 12 hours to finish. When it finds the optimal solution the algorithm prints "Solved with primal simplex". Afterward, nothing happens. I let it run for multiple hours after that but nothing changes. It seems to be stuck in another method or so that verbose does not print.
The log looks like this at the end.
Waiting for other threads to finish... 39807s
Concurrent spin time: 4957.69s (can be avoided by choosing Method=3)
Solved with primal simplex
Any ideas as to why this happens?
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