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<section class="tex2jax_ignore mathjax_ignore" id="acknowledgements">
<span id="id1"></span><h1>Acknowledgements<a class="headerlink" href="#acknowledgements" title="Link to this heading">#</a></h1>
<p>We thank all PETSc/Tao/petsc4py users for their many suggestions, bug reports, and encouragement.</p>
<p>Recent contributors to PETSc are listed in the <a class="reference external" href="https://gitlab.com/petsc/petsc">repository system</a>. The history can be visualized at
<a class="reference external" href="https://github.com/petsc/petsc/graphs/contributors">github.com/petsc/petsc/graphs/contributors</a>.</p>
<p>Earlier contributors to PETSc that are not captured in the repository system include:</p>
<ul class="simple">
<li><p>Asbjorn Hoiland Aarrestad, the explicit Runge-Kutta implementations, <code class="docutils notranslate"><span class="pre"><a href="../manualpages/TS/TSRK.html">TSRK</a></span></code>.</p></li>
<li><p>Guillaume Anciaux and Jose E. Roman, the interfaces to the partitioning packages PTScotch, Chaco, and Party.</p></li>
<li><p>Allison Baker, <code class="docutils notranslate"><span class="pre"><a href="../manualpages/KSP/KSPFGMRES.html">KSPFGMRES</a></span></code> and <code class="docutils notranslate"><span class="pre"><a href="../manualpages/KSP/KSPLGMRES.html">KSPLGMRES</a></span></code>.</p></li>
<li><p>Chad Carroll, the Win32 graphics.</p></li>
<li><p>Ethan Coon, <code class="docutils notranslate"><span class="pre"><a href="../manualpages/Bag/PetscBag.html">PetscBag</a></span></code> and many bug fixes.</p></li>
<li><p>Cameron Cooper, portions of <code class="docutils notranslate"><span class="pre"><a href="../manualpages/PetscSF/VecScatter.html">VecScatter</a></span></code> routines.</p></li>
<li><p>Patrick Farrell and Florian Wechsung, <code class="docutils notranslate"><span class="pre"><a href="../manualpages/PC/PCPATCH.html">PCPATCH</a></span></code> and <code class="docutils notranslate"><span class="pre"><a href="../manualpages/SNES/SNESPATCH.html">SNESPATCH</a></span></code>.</p></li>
<li><p>Paulo Goldfeld, early versions of the balancing Neumann-Neumann preconditioner <code class="docutils notranslate"><span class="pre"><a href="../manualpages/PC/PCNN.html">PCNN</a></span></code>.</p></li>
<li><p>Matt Hille.</p></li>
<li><p>Joel Malard, <code class="docutils notranslate"><span class="pre"><a href="../manualpages/KSP/KSPBCGS.html">KSPBCGS</a></span></code>.</p></li>
<li><p>Paul Mullowney, enhancements to portions of the original CUDA GPU interface.</p></li>
<li><p>Dave May, <code class="docutils notranslate"><span class="pre"><a href="../manualpages/KSP/KSPGCR.html">KSPGCR</a></span></code>.</p></li>
<li><p>Peter Mell, portions of <code class="docutils notranslate"><span class="pre"><a href="../manualpages/DMDA/DMDA.html">DMDA</a></span></code> routines.</p></li>
<li><p>Richard Mills, the <code class="docutils notranslate"><span class="pre"><a href="../manualpages/Mat/MATAIJPERM.html">MATAIJPERM</a></span></code> matrix format for the Cray X1; universal F90 array
interface; enhancements to <code class="docutils notranslate"><span class="pre"><a href="../manualpages/KSP/KSPIBCGS.html">KSPIBCGS</a></span></code>; the <code class="docutils notranslate"><span class="pre"><a href="../manualpages/Mat/MATAIJMKL.html">MATAIJMKL</a></span></code> matrix subclass.</p></li>
<li><p>Victor Minden, the original CUDA GPU interface.</p></li>
<li><p>Todd Munson, <code class="docutils notranslate"><span class="pre"><a href="../manualpages/Mat/MATSOLVERLUSOL.html">MATSOLVERLUSOL</a></span></code> as well as <code class="docutils notranslate"><span class="pre"><a href="../manualpages/KSP/KSPNASH.html">KSPNASH</a></span></code>, <code class="docutils notranslate"><span class="pre"><a href="../manualpages/KSP/KSPSTCG.html">KSPSTCG</a></span></code>, and
<code class="docutils notranslate"><span class="pre"><a href="../manualpages/KSP/KSPGLTR.html">KSPGLTR</a></span></code>.</p></li>
<li><p>Robert Scheichl, the original <code class="docutils notranslate"><span class="pre"><a href="../manualpages/KSP/KSPMINRES.html">KSPMINRES</a></span></code> implementation.</p></li>
<li><p>Karen Toonen, designed and implemented most of the original PETSc web pages.</p></li>
<li><p>Desire Nuentsa Wakam, <code class="docutils notranslate"><span class="pre"><a href="../manualpages/KSP/KSPDGMRES.html">KSPDGMRES</a></span></code>.</p></li>
<li><p>Liyang Xu, the interface to PVODE (now Sundials/CVODE) <code class="docutils notranslate"><span class="pre"><a href="../manualpages/TS/TSSUNDIALS.html">TSSUNDIALS</a></span></code>.</p></li>
</ul>
<p>The Toolkit for Advanced Optimization (Tao) developers especially thank Jorge Moré
for his leadership, vision, and effort on previous versions of Tao. Tao has
also benefited from the work of various researchers who have provided solvers, test problems,
and interfaces. In particular, we acknowledge: Adam Denchfield, Elizabeth Dolan, Evan Gawlik,
Michael Gertz, Xiang Huang, Lisa Grignon, Manojkumar Krishnan, Gabriel Lopez-Calva,
Jarek Nieplocha, Boyana Norris, Hansol Suh, Stefan Wild, Limin Zhang, and
Yurii Zinchenko.</p>
<p>PETSc source code contains modified routines from the following public
domain software packages:</p>
<ul class="simple">
<li><p>LINPACK - dense matrix factorization and solve; converted to C using
<code class="docutils notranslate"><span class="pre">f2c</span></code> and then hand-optimized for small matrix sizes, for block
matrix data structures;</p></li>
<li><p>MINPACK - sequential matrix coloring routines for finite
difference Jacobian evaluations; converted to C using <code class="docutils notranslate"><span class="pre">f2c</span></code>;</p></li>
<li><p>SPARSPAK - matrix reordering routines, converted to C
using <code class="docutils notranslate"><span class="pre">f2c</span></code>;</p></li>
<li><p>libtfs - the efficient, parallel direct solver developed by Henry
Tufo and Paul Fischer for the direct solution of a coarse grid
problem (a linear system with very few degrees of freedom per
processor).</p></li>
</ul>
<p>PETSc interfaces to many external software packages including:</p>
<ul class="simple">
<li><p>BLAS and LAPACK - numerical linear algebra;</p></li>
<li><p>Chaco - A graph partitioning package;
<a class="reference external" href="http://www.cs.sandia.gov/CRF/chac.html">http://www.cs.sandia.gov/CRF/chac.html</a></p></li>
<li><p>Elemental - Jack Poulson’s parallel dense matrix solver package;
<a class="reference external" href="http://libelemental.org/">http://libelemental.org/</a></p></li>
<li><p>HDF5 - the data model, library, and file format for storing and
managing data,
<a class="reference external" href="https://support.hdfgroup.org/HDF5/">https://support.hdfgroup.org/HDF5/</a></p></li>
<li><p>hypre - the LLNL preconditioner library;
<a class="reference external" href="https://computation.llnl.gov/projects/hypre-scalable-linear-solvers-multigrid-methods">https://computation.llnl.gov/projects/hypre-scalable-linear-solvers-multigrid-methods</a></p></li>
<li><p>LUSOL - sparse LU factorization code (part of MINOS) developed by
Michael Saunders, Systems Optimization Laboratory, Stanford
University;
<a class="reference external" href="http://www.sbsi-sol-optimize.com/">http://www.sbsi-sol-optimize.com/</a></p></li>
<li><p>MATLAB</p></li>
<li><p>Metis/ParMeTiS - parallel graph partitioner,
<a class="reference external" href="https://www-users.cs.umn.edu/~karypis/metis/">https://www-users.cs.umn.edu/~karypis/metis/</a></p></li>
<li><p>MUMPS - MUltifrontal Massively Parallel sparse direct
Solver developed by Patrick Amestoy, Iain Duff, Jacko Koster, and
Jean-Yves L’Excellent;
<a class="reference external" href="https://mumps-solver.org/">https://mumps-solver.org/</a></p></li>
<li><p>Party - A graph partitioning package;</p></li>
<li><p>PaStiX - Parallel sparse LU and Cholesky solvers;
<a class="reference external" href="http://pastix.gforge.inria.fr/">http://pastix.gforge.inria.fr/</a></p></li>
<li><p>PTScotch - A graph partitioning package;
<a class="reference external" href="http://www.labri.fr/Perso/~pelegrin/scotch/">http://www.labri.fr/Perso/~pelegrin/scotch/</a></p></li>
<li><p>SPAI - for parallel sparse approximate inverse preconditioning;
<a class="reference external" href="https://cccs.unibas.ch/lehre/software-packages/">https://cccs.unibas.ch/lehre/software-packages/</a></p></li>
<li><p>SuiteSparse - sequential sparse solvers, developed by
Timothy A. Davis;
<a class="reference external" href="http://faculty.cse.tamu.edu/davis/suitesparse.html">http://faculty.cse.tamu.edu/davis/suitesparse.html</a></p></li>
<li><p>SUNDIALS/CVODE - (now an out-dated version), parallel ODE integrator;
<a class="reference external" href="https://computation.llnl.gov/projects/sundials">https://computation.llnl.gov/projects/sundials</a></p></li>
<li><p>SuperLU and SuperLU_Dist - the efficient sparse LU codes
developed by Jim Demmel, Xiaoye S. Li, and John Gilbert;
<a class="reference external" href="https://crd-legacy.lbl.gov/~xiaoye/SuperLU">https://crd-legacy.lbl.gov/~xiaoye/SuperLU</a></p></li>
<li><p>STRUMPACK - the STRUctured Matrix Package;
<a class="reference external" href="https://portal.nersc.gov/project/sparse/strumpack/">https://portal.nersc.gov/project/sparse/strumpack/</a></p></li>
<li><p>Triangle and Tetgen - mesh generation packages;
<a class="reference external" href="https://www.cs.cmu.edu/~quake/triangle.html">https://www.cs.cmu.edu/~quake/triangle.html</a>
<a class="reference external" href="http://wias-berlin.de/software/tetgen/">http://wias-berlin.de/software/tetgen/</a></p></li>
<li><p>Trilinos/ML - Sandia’s main multigrid preconditioning package;
<a class="reference external" href="https://trilinos.github.io/">https://trilinos.github.io/</a></p></li>
<li><p>Zoltan - graph partitioners from Sandia National Laboratory;
<a class="reference external" href="http://www.cs.sandia.gov/zoltan/">http://www.cs.sandia.gov/zoltan/</a></p></li>
</ul>
<p>These are all optional packages and do not need to be installed to use
PETSc.</p>
<p>PETSc software is developed and maintained using</p>
<ul class="simple">
<li><p><a class="reference external" href="https://git-scm.com/">Git</a> revision control system</p></li>
</ul>
<p>PETSc documentation has been generated using</p>
<ul class="simple">
<li><p><a class="reference external" href="https://www.sphinx-doc.org">https://www.sphinx-doc.org</a></p></li>
<li><p><a class="reference external" href="http://wgropp.cs.illinois.edu/projects/software/sowing/">Sowing text processing tools developed by Bill Gropp</a></p></li>
<li><p>c2html</p></li>
</ul>
</section>
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