24 lines
1.3 KiB
Markdown
24 lines
1.3 KiB
Markdown
# gmgrid: Geometric multigrid on CPU (OpenMP)
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### Status on 2025-May-14
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- The multigrid part is deactivated via `*#undef MG` in *main.cpp* and so only a simple Jacobi iteration is performed as solver.
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- `make run`
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- or `main.GCC_ levels` with number of `levels` in [0,7].
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### Data structures/implementation for GPU
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- use data structures from cg_2:Framework for preconditioned solvers on GPU and CPU
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- suggested: class vec from vdop_gpu.h
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- suggested: class CRS_Matrix_GPU from crsmatrix_gpu.h
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- use cuBLAS, cuSPARSE and more libraries whenever possible.
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### current code structure
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- *main.cpp*
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- *binaryIO.cpp* : reads CRS matrix and vector from files
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- *vdop.cpp* : some basic vector operations on CPU, also in *utils.h*
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- *geom.cpp* : reads the coarse geometry, performes mesh handling and includes mesh hierarchy
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- *getmatrix.cpp* : compressed row storage matrix and its generation from a 2D mesh
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- *cuthill_mckee_ordering.cpp* : graph reordering to minimize the bandwidth
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- *jacsolve.cpp* : Jacobi solver/smoother for a linear system of equations with CRS matrix; multigrid solver
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- *elements.cpp* : more general elements - experimental. Try with *el_main.cpp*
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- *generateCRS.cpp* : Reads mesh files and generates files output with stiffness matrix (Laplace) and right hand side.
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