Greg Glockner
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Recent activity by Greg Glockner-
How do I submit a help request as an Academic user?
Gurobi provides the most powerful mathematical programming solver to the academic community at no cost and with no restrictions on features.For help with installation or licensingGurobi also provid...
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How do I avoid an out-of-memory condition while using the Java API?
In some cases, a Java program might produce an out-of-memory error, even though the same model can be solved as an LP or MPS file. The memory heap in Java is fixed at runtime, which can lead to an ...
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How do I resolve the error "Communication failed" when running grbgetkey?
While running grbgetkey to retrieve a license file, you might receive the error:Communication failed, check your network connection or set variable HTTPS_PROXY if you need a proxyIf your computer i...
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How do I request a license for an older version of Gurobi?
Gurobi licenses are backwards compatible, meaning you can use them to run versions of Gurobi older than the licensed version. Regardless of which Gurobi version is being used, Gurobi needs to know ...
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What system changes can invalidate a license file?
Errors such as: ERROR 10009: HostID mismatch ERROR 10009: License is for 8 cores, machine has XX indicate that the license file was generated for a machine with a different host ID, different cor...
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How do I release a shared, limited-use license?
Floating licenses have a use limit, which is enforced by monitoring when tokens are issued/released. If all tokens are in use, any application attempting to use Gurobi to solve optimization proble...
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Using gurobipy on Apple Silicon and Monterey (macOS 12)
On macOS Monterey (macOS 12), the default python3 (/usr/bin/python3) is version 3.8. However, Gurobi v9.1 and later only support arm64 for Python >= 3.9. If you are on a machine with an Apple Silic...
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How do I model logical and general expressions?
General Constraints can be used to model many types of logical expressions, like AND and OR relationships. More complex logical expressions can be created via combinations of general constraints. F...
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Why does my MPS file produce different objectives with different solvers?
The MPS file format does not indicate whether the objective should be maximized or minimized. Solvers may interpret this lack of an objective sense differently. By default, Gurobi assumes the objec...
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How do I model piecewise-linear functions?
Gurobi versions 9.0 and later include an interface for piecewise-linear constraints (e.g., Model.addGenConstrPWL() in Python). See the General Constraints section of the reference manual for more i...