Obviously if we have a large LP then input procedures can become unwieldy. Nowadays it tends to be the case that LP input comes via an algebraic modelling language such as GAMS or AMPL . Obviously if we have a large LP then the output becomes potentially too large to digest intelligently. A report generator is a piece of software that enables you to easily extract from the LP solution items of interest and present them in a readable format. Scaling The computer time required to solve an LP can be affected by how the problem data is scaled.
Many packages have options to scale the data automatically.
Restarting Having solved an LP it is often worthwhile saving the final solution. Generally restarting from the previously saved solution, rather than from scratch, reduces solution time. In column generation we choose to start solving the LP problem using just a subset of the variables and automatically include any additional variables that we need as required. Often at the LP optimal solution many variables have the value zero and so need never really have been considered during the course of the simplex algorithm. This is an option available in some packages and involves automatically investigating how the solution changes as some parameter is altered.