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A Julia interface to the Coin-OR Branch and Cut solver (CBC)


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Cbc.jl is a wrapper for the COIN-OR Branch and Cut (Cbc) solver.

The wrapper has two components:


This wrapper is maintained by the JuMP community and is not a COIN-OR project.

Getting help

If you need help, please ask a question on the JuMP community forum.

If you have a reproducible example of a bug, please open a GitHub issue.


Cbc.jl is licensed under the MIT License.

The underlying solver, coin-or/Cbc, is licensed under the Eclipse public license.


Install Cbc using Pkg.add:

import Pkg

In addition to installing the Cbc.jl package, this will also download and install the Cbc binaries. You do not need to install Cbc separately.

To use a custom binary, read the Custom solver binaries section of the JuMP documentation.

Use with JuMP

To use Cbc with JuMP, use Cbc.Optimizer:

using JuMP, Cbc
model = Model(Cbc.Optimizer)
set_attribute(model, "logLevel", 1)

MathOptInterface API

The COIN Branch-and-Cut (Cbc) optimizer supports the following constraints and attributes.

List of supported objective functions:

List of supported variable types:

List of supported constraint types:

List of supported model attributes:

List of supported optimizer attributes:

List of supported variable attributes:

List of supported constraint attributes:


Options are, unfortunately, not well documented.

The following options are likely to be the most useful:

Parameter Example Explanation
seconds 60.0 Solution timeout limit
logLevel 2 Set to 0 to disable solution output
maxSolutions 1 Terminate after this many feasible solutions have been found
maxNodes 1 Terminate after this many branch-and-bound nodes have been evaluated
allowableGap 0.05 Terminate after optimality gap is less than this value (on an absolute scale)
ratioGap 0.05 Terminate after optimality gap is smaller than this relative fraction
threads 1 Set the number of threads to use for parallel branch & bound

The complete list of parameters can be found by running the cbc executable and typing ? at the prompt.

Start the cbc executable from Julia as follows:

using Cbc_jll
Cbc_jll.cbc() do exe