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ElmerCSC
GitHub Repository: ElmerCSC/elmerfem
 Path: blob/devel/fem/examples/TrilinosSolvers/belos_ml.xml
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<!-- this parameter file demonstrates how to use the AMG solver ML -->

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<!-- without an outer Krylov iteration. This is useful for block   -->

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<!-- preconditioning with an inexact inner solve. At the moment    -->

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<!-- you can only set the number of cycles, not a convergence      -->

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<!-- tolerance, as ML is handled internally as a preconditioner,   -->

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<!-- not a solver.                                                 -->

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<ParameterList name="ML stand-alone"><!--{-->

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  <Parameter name="Dump Matrix" type="bool" value="false"/>

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  <Parameter name="Dump Vectors" type="bool" value="false"/>

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  <Parameter name="Iterative Solver" type="string" value="GMRES"/>   

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  <!-- parameters for the iterative solver (Belos) -->

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  <ParameterList name="Belos">

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    <Parameter name="Maximum Iterations" type="int" value="500"/>

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    <Parameter name="Block Size" type="int" value="1"/>

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    <Parameter name="Maximum Restarts" type="int" value="0"/>

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    <Parameter name="Convergence Tolerance" type="double" value="1.0e-10"/>

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    <Parameter name="Output Frequency" type="int" value="1"/>

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    <Parameter name="Show Maximum Residual Norm Only" type="bool" value="1"/>

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  </ParameterList>

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  <Parameter name="Preconditioner" type="string" value="ML"/>

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  <!-- these are some diagnostic tools in ML that can be useful: -->

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  <Parameter name="ML: Analyze Cycle" type="bool" value="false"/>

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  <Parameter name="ML: Test Smoothers" type="bool" value="false"/>

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  <ParameterList name="ML">

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    <Parameter name="ML output" type="int" value="0"/>

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    <Parameter name="ML validate parameter list" type="bool" value="true"/>

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    <!-- number of unknowns per node -->

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    <Parameter name="PDE equations" type="int" value="1"/>

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    <!-- number of MG cycles -->

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    <Parameter name="cycle applications" type="int" value="1"/>

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    <!-- SA stands for 'smoothed aggregation', other options include -->

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    <!-- DD (two-level domain decomposition), DD-ML (3-level method),-->

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    <!-- NSSA (non-symmetric SA etc.                                 -->

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    <Parameter name="default values" type="string" value="SA"/>

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    <Parameter name="max levels" type="int" value="7"/>

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    <Parameter name="aggregation: type" type="string" value="Uncoupled-MIS"/>

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    <Parameter name="prec type" type="string" value="MGV"/>

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    <Parameter name="coarse: type" type="string" value="Amesos-KLU"/>

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    <Parameter name="smoother: type" type="string" value="symmetric Gauss-Seidel"/>

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    <Parameter name="smoother: damping factor" type="double" value="0.5"/>

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    <Parameter name="smoother: pre or post" type="string" value="both"/>

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    <Parameter name="smoother: sweeps" type="int" value="1"/>

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    <!-- etc., we stick to the default values for this example -->

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  </ParameterList>

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</ParameterList><!--}-->

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