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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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<A NAME="MATSOLVERSSTRUMPACK"><H1>MATSOLVERSSTRUMPACK</H1></A>
"strumpack" - A solver package providing a direct sparse solver (<A HREF="../PC/PCLU.html#PCLU">PCLU</A>) and a preconditioner (<A HREF="../PC/PCILU.html#PCILU">PCILU</A>) using low-rank compression via the external package STRUMPACK. Consult the STRUMPACK-sparse manual for more info.
<P>
Use
./configure --download-strumpack
to have PETSc installed with STRUMPACK
<P>
Use
-pc_type lu -pc_factor_mat_solver_type strumpack
to use this as an exact (direct) solver, use
-pc_type ilu -pc_factor_mat_solver_type strumpack
to enable low-rank compression (i.e, use as a preconditioner).
<P>
Works with AIJ matrices
<P>
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_strumpack_verbose</B></TD>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_strumpack_hss_rel_tol <1e</B></TD><TD>- 2> - Relative compression tolerance (None)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_strumpack_hss_abs_tol <1e</B></TD><TD>- 8> - Absolute compression tolerance (None)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_strumpack_colperm <TRUE> </B></TD><TD>- Permute matrix to make diagonal nonzeros (None)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_strumpack_hss_min_sep_size <256> </B></TD><TD>- Minimum size of separator for HSS compression (None)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_strumpack_max_rank </B></TD><TD>- Maximum rank in HSS compression, when using pctype ilu (None)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_strumpack_leaf_size </B></TD><TD>- Size of diagonal blocks in HSS approximation, when using pctype ilu (None)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_strumpack_reordering <METIS> </B></TD><TD>- Sparsity reducing matrix reordering (choose one of) NATURAL METIS PARMETIS SCOTCH PTSCOTCH RCM (None)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_strumpack_iterative_solver <DIRECT> </B></TD><TD>- Select iterative solver from STRUMPACK (choose one of) AUTO DIRECT REFINE PREC_GMRES GMRES PREC_BICGSTAB BICGSTAB (None)
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCLU.html#PCLU">PCLU</A>, <A HREF="../PC/PCILU.html#PCILU">PCILU</A>, <A HREF="../Mat/MATSOLVERSUPERLU_DIST.html#MATSOLVERSUPERLU_DIST">MATSOLVERSUPERLU_DIST</A>, <A HREF="../Mat/MATSOLVERMUMPS.html#MATSOLVERMUMPS">MATSOLVERMUMPS</A>, <A HREF="../PC/PCFactorSetMatSolverType.html#PCFactorSetMatSolverType">PCFactorSetMatSolverType</A>(), <A HREF="../Mat/MatSolverType.html#MatSolverType">MatSolverType</A>
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>beginner<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/mat/impls/aij/mpi/strumpack/strumpack.c.html#MATSOLVERSSTRUMPACK">src/mat/impls/aij/mpi/strumpack/strumpack.c</A>
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