Background

The optimization session can be viewed as an environment or container that:

holds all model data and state parameters and
manages all processes

related to a particular optimization task. It contains a complete definition and current state of the optimization task.

Within a session the optimization processes can be

started,
paused, and
continued

at any time. Meanwhile, the optimization task itself can be

changed or
upgraded

as desired.

A session is a permanent object, saved automatically at appropriate events. Therefore, stopping and restarting ProTOp does not have any influence on the session. For example, a running optimization job can simply be interrupted and continued again (from the same point) after stopping and restarting ProTOp.