Model instance and entire GAMS state saved to scratch directory, GAMS exits (and vacates memory), and the solver script is called. After the solver terminates, GAMS restarts from the saved state and continues to executing.

Model instance saved to scratch directory, the solver is called from a shell while GAMS remains open.

Model instance saved to scratch directory, the solver is called with a spawn (if possible) or a shell (if spawn is not possible) while GAMS remains open - If this is not supported by the selected solver, it gets reset to 1 automatically.

Model instance saved to scratch directory, the solver starts the solution and GAMS continues.

Model instance saved to scratch directory, the solver starts the solution and GAMS waits for the solver to come back but uses same submission process as 3 (test mode)

The model instance is passed to the solver in-memory - If this is not supported by the selected solver, it gets reset to 2 automatically.

The model instance is passed to the solver in-memory, the solver starts the solution and GAMS continues.

The model instance is passed to the solver in-memory, the solver starts the solution and GAMS waits for the solver to come back but uses same submission process as 6 (test mode)