Gurobi SolverOptions documentation

[ClaraBuettner]

threads

Number of threads to apply to parallel algorithms (concurrent or barrier).

default(0): Uses all cores in the machine Reduce if parallel calculations or tight memory.

http://www.gurobi.com/documentation/8.0/refman/threads.html

method

Algorithm used to solve optimization of lopf.

default (-1, concurrent): chooses between simplex or barrier method due to matrix range 1 (simplex): slower but less sensitive for numerical issues 2 (barrier): fastest method but sensitive for numerical issues

http://www.gurobi.com/documentation/8.0/refman/numerics_choosing_the_righ.html http://www.gurobi.com/documentation/8.0/refman/method.html#parameter:Method

crossover (barrier only)

Determines the crossover strategy used to transform the interior solution produced by barrier into a basic solution.

default(-1): chooses strategy automatically preferred: 0 disables crossover, solves fastest but may need 'NumericFocus' and 'BarHomogenus' to avoid numerical issues

http://www.gurobi.com/documentation/8.0/refman/crossover.html

BarConvTol (barrier only)

The barrier solver terminates when the relative difference between the primal and dual objective values is less than the specified tolerance.

default: 1e-8 preferred: 1e-5 little less accurate, but solves faster

http://www.gurobi.com/documentation/8.0/refman/barconvtol.html

FeasibilityTol

Tolerance of all constraints.

default: 1e-6 preferred: 1e-5 less accurate, but reduces number of iterations

http://www.gurobi.com/documentation/8.0/refman/feasibilitytol.html

logFile

Destination and name of gurobi log file.

default: None preferred: 'gurobi_eTraGo.log'

BarHomogeneous (barrier only)

Determines whether to use the homogeneous barrier algorithm.

default: -1 homogeneous barrier algorithm turned off, faster but sensitive for numerical issues preferred: 1 homogeneous barrier algorithm turned on, bit slower but less sensitive for numerical issues, often used when crossover turned off

http://www.gurobi.com/documentation/8.0/refman/barhomogeneous.html

NumericFocus

Controls the degree to which the code attempts to detect and manage numerical issues.

default: 0 automatic choice with a slight preference for speed 1 - 3 shift the focus towards being slower but less sensitive for numerical issues

http://www.gurobi.com/documentation/8.0/refman/numericfocus.html

[wolfbunke]

Will this be part of the eTraGo RTD documentation and/or release 0.7?

[ClaraBuettner]

Some settings cause problems due to numerical issues, so maybe the 'preferred' settings will change. And it's only useful with gurobi. I'm not sure if it should be added there.