How to fix "OMP: Warning #XXX: Cannot determine machine load balance - Using KMP_DYNAMIC_MODE=thread limit"?

When attempting to invert a matrix using the inv(A) command in MATLAB, a Windows terminal window may open displaying the following error message with an error code #224 or #228:

OMP: Warning #224: Cannot determine machine load balance - Using KMP_DYNAMIC_MODE=thread limit
OMP: Warning #228: Cannot determine machine load balance - Using KMP_DYNAMIC_MODE=thread limit

Answer 1

[MathWorks Support Team]

This error can occur if the OpenMP settings within your environment are configured in a way that conflicts with MATLAB's default behavior. MATLAB typically does not enable dynamic mode for OpenMP, so encountering this warning suggests that your settings might have been overridden by an environment variable.

To investigate, you can run the following command in the MATLAB Command Window:

>> !set

This command will display all environment variables set within MATLAB's environment. Look for a variable named OMP_DYNAMIC. If it exists, check its value. If OMP_DYNAMIC is set to "true," this could be the source of the error. In this case, you should examine the environment variables configured in Windows and consider unsetting OMP_DYNAMIC. Setting this variable globally for all applications is generally not advisable, and the application that configured it should ideally set it locally.