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2024-04-09

FAQ 005477 | The calculation in RFEM 6 takes a very long time, but the processor utilization of my…

Question:
The calculation in RFEM 6 takes a very long time, but the processor utilization of my system is low. Why is this?

Answer:
A reason for the calculation time taking a while with little utilization of your computer's processor can be caused by using the Iterative solver instead of the Direct solver. Both options control the method used for solving the equation system.

The direct solver is a method that uses matrix decomposition techniques, such as the LU decomposition, to solve the system of equations in a single step. This approach is generally more robust and can handle any type of problem, but it may require more memory and computational resources, especially for very large systems.
The iterative solver, such as the Conjugate Gradient method or the GMRES (Generalized Minimal Residual) method, solves the system of equations by iteratively refining the solution.

The solver method that leads to faster results depends on the complexity of the model and the amount of the main memory RAM available in the machine. If resources are not an issue when solving large complex models, then the Direct solver is recommended in most cases and will be the fastest. Make sure to check this under the Static Analysis Settings in RFEM 6.

► Image | Static Analysis Settings - Method for Equation System https://www.dlubal.com/en/img/048596