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Decision Optimization run parameters

Run parameters and Environment

You can select various run parameters for the optimization solve in the Decision Optimization experiment UI.

CPLEX runtime version

As CPLEX engine performance improves with each new version, older versions are deprecated and removed over time. Runtimes, based on these engines, are used in building and deploying Decision Optimization models. Currently, the do_22.1 runtime, based on CPLEX 22.1 is used automatically when you create and run scenarios. The do_20.1 runtime based on CPLEX 20.1 is also available. You can view and change your CPLEX runtime in the experiment Overview. Open the Environment tab of the Information pane and select one of the available environments for your type of model (Python, OPL, CPLEX, CPO). See Overview for more details.

Python version

You can view and change the Python environment in the experiment Overview on the Environment tab of the Information pane. For more information, see Overview and Configuring environments and adding Python extensions.

Run configuration parameters

When you click the Configure run icon Configure run icon next to the Run button in the Build model view, a window opens showing you the currently set parameter values.

Here you can select and edit different run configuration parameters.

You can click Add parameter and then choose from the following parameters from the Select Parameters drop-down menu.

Name Type Description
Runtime limit Number You can use this parameter to set a time limit in seconds.
Log detail level Enum
  • OFF
  • INFO
  • FINE
You can use this parameter to define the level of detail provided by the engine log. The default value is INFO.
Job memory Number You can use this parameter to set a job memory limit in MB.
Intermediate solution delivery Enum
  • NO
  • Every minute
  • Every 2 minutes
  • Every 5 minutes
  • Every 10 minutes
  • Every 15 minutes
You can use this parameter to obtain a sample of intermediate solutions while the solve is running. The default value is NO, which means that no intermediate solutions are displayed. To see intermediate solutions, set this parameter to a frequency. When set, you can see intermediate solutions by clicking New data available in the graphical display that is shown during the run. The following values, which are sampled with the frequency you set, are then displayed.
  • Statistics for a maximum of 3 intermediate solutions.
  • KPIs for a maximum of 3 intermediate solutions.
  • The solution table that shows only values from the last sampling.
See the IntermediateSolutions sample in the Model_Builder folder of the DO-samples in the Decision Optimization GitHub. Select the relevant product and version subfolder.

If you choose Custom parameter from the Select Parameters drop-down menu, you can add the following advanced parameters.

Name Description
Modeling Assistant only

For CPLEX ma.cplex.parameters.<Python cplex parameter name>

For CPO ma.cpo.parameters.<Python cpo parameter name>

Python names for CPLEX and CPO parameters can be entered with the prefixes ma.cplex.parameters. or ma.cpo.parameters.

For example,

ma.cplex.parameters.mip.tolerances.absmipgap

ma.cpo.SearchType

For a list of parameters see:

After you set the run configuration parameters, they will be used with those values for all subsequent runs for that scenario.

You can remove set parameters by hovering over the parameter and clicking the Remove icon.

Environment for scenario

The Environment tab in this pane shows you the default run environment that is being used for your experiment. Environment tab of Run Configuration pane for scenario 1

The Decision Optimization environment currently supports Python 3.10. The default version is Python 3.10.

See the EnvironmentAndExtension example in the Model_Builder folder of the DO-samples in the Decision Optimization GitHub. This example uses an environment with an extension that contains a library file and YAML code.

You can also select a different run environment for a particular scenario, without changing the default for all the other scenarios. See Selecting a different run environment for a particular scenario for more details.

See also Environment tab in Overview information pane and Hardware and software configuration.

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