When you use the ILOG CPLEX Barrier Optimizer with no crossover, you can save the primal and dual variable values and their associated reduced cost and dual values in a SOL-format file (that is, a solution file with the extension .sol). You can then read that solution file into ILOG CPLEX before you initiate a crossover at a later time. After you read a solution file into ILOG CPLEX, all three optimizers (primal simplex, dual simplex, and barrier simplex) automatically invoke crossover. See the ILOG CPLEX File Format Reference Manual, especially SOL File Format: Solution Files, for more about solution files.
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