| -pc_gamg_type <type> | - one of agg, geo, or classical
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| -pc_gamg_repartition <true,default=false> | - repartition the degrees of freedom accross the coarse grids as they are determined
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| -pc_gamg_reuse_interpolation <true,default=false> | - when rebuilding the algebraic multigrid preconditioner reuse the previously computed interpolations
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| -pc_gamg_asm_use_agg <true,default=false> | - use the aggregates from the coasening process to defined the subdomains on each level for the PCASM smoother
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| -pc_gamg_process_eq_limit <limit, default=50> | - GAMG will reduce the number of MPI processes used directly on the coarse grids so that there are around <limit>
equations on each process that has degrees of freedom
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| -pc_gamg_coarse_eq_limit <limit, default=50> | - Set maximum number of equations on coarsest grid to aim for.
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| -pc_gamg_threshold[] <thresh,default=0> | - Before aggregating the graph GAMG will remove small values from the graph on each level
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