How to fix "OMP: Warning #XYZ: 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 and is set to "true," this could be causing the error. In such a case, you should examine the environment variables configured in Windows and consider removing the OMP_DYNAMIC variable. Setting this variable globally for all applications is generally not advisable; ideally, the application that requires it should set it locally.