Large nonlinear model

GAMS users build large GAMS models! Here is an example of a global trade model I am helping to build. I ran it for 5 years in one swoop:

equations	627,235
variables	662,290
generation time	6 seconds
solution time	3856 seconds
total time	1:04 (hh:mm)

We can also run it year by year:

equations period 1	125,435
variables period 1	132,458
generation time period 1	1.3 seconds
solution time period 1	2 seconds
solution time period 2	59 seconds
solution time period 3	119 seconds
solution time period 4	102 seconds
solution time period 5	20 seconds
total time	0:05 (hh:mm)

This way is much faster.

This is an example where we benefit that the modeling language supports constructs like loops etc.