Fast related solutions

Restarted models that are solved again a are restarting from a file which contains the results of a previous file generally solve quickly because of GAMS ability to suggest an advanced basis that improves solver performance.  Thus one can execute and solve a model through its initial solve and then save a set of work files.  In turn, restarted programs tend to rapidly solve alternative models or the same model under different options.  For example a restart using two lines one to activate GASMBAS as the solver and one to solve generates a stored basis rapidly, sometimes in zero iterations (eg see gamsbas.gms) and its use in rgamsbas.bat.