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<div class="section" id="acknowledgments">
<span id="chapter-acknowledgements"></span><h1>Acknowledgments<a class="headerlink" href="#acknowledgments" title="Permalink to this headline">¶</a></h1>
<p>We thank all PETSc users for their many suggestions, bug reports, and
encouragement.</p>
<p>Recent contributors to PETSc can be seen by visualizing the history of
the PETSc git repository, for example 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 include:</p>
<ul class="simple">
<li><p>Asbjorn Hoiland Aarrestad - the explicit Runge-Kutta implementations
(<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/TS/TSRK.html#TSRK">TSRK</a></span></code>)</p></li>
<li><p>G. Anciaux and J. Roman - the interfaces to the partitioning packages
PTScotch, Chaco, and Party;</p></li>
<li><p>Allison Baker - the flexible GMRES
(<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/KSP/KSPFGMRES.html#KSPFGMRES">KSPFGMRES</a></span></code>)
and LGMRES
(<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/KSP/KSPLGMRES.html#KSPLGMRES">KSPLGMRES</a></span></code>)
code;</p></li>
<li><p>Chad Carroll - Win32 graphics;</p></li>
<li><p>Ethan Coon - the
<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Sys/PetscBag.html#PetscBag">PetscBag</a></span></code>
and many bug fixes;</p></li>
<li><p>Cameron Cooper - portions of the
<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Vec/VecScatter.html#VecScatter">VecScatter</a></span></code>
routines;</p></li>
<li><p>Patrick Farrell -
<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCPATCH.html#PCPATCH">PCPATCH</a></span></code>
and
<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/SNES/SNESPATCH.html#SNESPATCH">SNESPATCH</a></span></code>;</p></li>
<li><p>Paulo Goldfeld - the balancing Neumann-Neumann preconditioner
(<code class="docutils literal notranslate"><span class="pre">`<a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCNN.html#PCNN">PCNN</a></span></code>);</p></li>
<li><p>Matt Hille;</p></li>
<li><p>Joel Malard - the BICGStab(l) implementation
(<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/KSP/KSPBCGSL.html#KSPBCGSL">KSPBCGSL</a></span></code>);</p></li>
<li><p>Paul Mullowney, enhancements to portions of the NVIDIA GPU interface;</p></li>
<li><p>Dave May - the GCR implementation
(<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/KSP/KSPGCR.html#KSPGCR">KSPGCR</a></span></code>);</p></li>
<li><p>Peter Mell - portions of the
<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/DMDA/DMDA.html#DMDA">DMDA</a></span></code>
routines;</p></li>
<li><p>Richard Mills - the <code class="docutils literal notranslate"><span class="pre">AIJPERM</span></code> matrix format
(<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MATAIJPERM.html#MATAIJPERM">MATAIJPERM</a></span></code>)
for the Cray X1 and universal F90 array interface;</p></li>
<li><p>Victor Minden - the NVIDIA GPU interface;</p></li>
<li><p>Lawrence Mitchell -
<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCPATCH.html#PCPATCH">PCPATCH</a></span></code>
and
<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/SNES/SNESPATCH.html#SNESPATCH">SNESPATCH</a></span></code>;</p></li>
<li><p>Todd Munson - the LUSOL (sparse solver in MINOS) interface
(<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MATSOLVERLUSOL.html#MATSOLVERLUSOL">MATSOLVERLUSOL</a></span></code>)
and several Krylov methods;</p></li>
<li><p>Adam Powell - the PETSc Debian package;</p></li>
<li><p>Robert Scheichl - the MINRES implementation
(<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/KSP/KSPMINRES.html#KSPMINRES">KSPMINRES</a></span></code>);</p></li>
<li><p>Kerry Stevens - the pthread-based
<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Vec/Vec.html#Vec">Vec</a></span></code>
and
<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/Mat.html#Mat">Mat</a></span></code>
classes plus the various thread pools (no longer available);</p></li>
<li><p>Karen Toonen - design and implementation of much of the PETSc web
pages;</p></li>
<li><p>Desire Nuentsa Wakam - the deflated GMRES implementation
(<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/KSP/KSPDGMRES.html#KSPDGMRES">KSPDGMRES</a></span></code>);</p></li>
<li><p>Florian Wechsung -
<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCPATCH.html#PCPATCH">PCPATCH</a></span></code>
and
<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/SNES/SNESPATCH.html#SNESPATCH">SNESPATCH</a></span></code>;</p></li>
<li><p>Liyang Xu - the interface to PVODE, now SUNDIALS/CVODE
(<code class="docutils literal notranslate"><span class="pre"><a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/TS/TSSUNDIALS.html#TSSUNDIALS">TSSUNDIALS</a></span></code>).</p></li>
</ul>
<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 literal 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 - see page ; sequential matrix coloring routines for finite
difference Jacobian evaluations; converted to C using <code class="docutils literal notranslate"><span class="pre">f2c</span></code>;</p></li>
<li><p>SPARSPAK - see page ; matrix reordering routines, converted to C
using <code class="docutils literal 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 the following external software:</p>
<ul>
<li><p>BLAS and LAPACK - numerical linear algebra;</p></li>
<li><div class="line-block">
<div class="line">Chaco - A graph partitioning package;</div>
<div class="line"><a class="reference external" href="http://www.cs.sandia.gov/CRF/chac.html">http://www.cs.sandia.gov/CRF/chac.html</a></div>
</div>
</li>
<li><div class="line-block">
<div class="line">Elemental - Jack Poulson’s parallel dense matrix solver package;</div>
<div class="line"><a class="reference external" href="http://libelemental.org/">http://libelemental.org/</a></div>
</div>
</li>
<li><div class="line-block">
<div class="line">HDF5 - the data model, library, and file format for storing and
managing data,</div>
<div class="line"><a class="reference external" href="https://support.hdfgroup.org/HDF5/">https://support.hdfgroup.org/HDF5/</a></div>
</div>
</li>
<li><div class="line-block">
<div class="line">hypre - the LLNL preconditioner library;</div>
<div class="line"><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></div>
</div>
</li>
<li><div class="line-block">
<div class="line">LUSOL - sparse LU factorization code (part of MINOS) developed by
Michael Saunders, Systems Optimization Laboratory, Stanford
University;</div>
<div class="line"><a class="reference external" href="http://www.sbsi-sol-optimize.com/">http://www.sbsi-sol-optimize.com/</a></div>
</div>
</li>
<li><p>MATLAB - see page ;</p></li>
<li><div class="line-block">
<div class="line">Metis/ParMeTiS - see page , parallel graph partitioner,</div>
<div class="line"><a class="reference external" href="https://www-users.cs.umn.edu/~karypis/metis/">https://www-users.cs.umn.edu/~karypis/metis/</a></div>
</div>
</li>
<li><div class="line-block">
<div class="line">MUMPS - see page , MUltifrontal Massively Parallel sparse direct
Solver developed by Patrick Amestoy, Iain Duff, Jacko Koster, and
Jean-Yves L’Excellent;</div>
<div class="line"><a class="reference external" href="http://mumps.enseeiht.fr/">http://mumps.enseeiht.fr/</a></div>
</div>
</li>
<li><div class="line-block">
<div class="line">Party - A graph partitioning package;</div>
</div>
</li>
<li><div class="line-block">
<div class="line">PaStiX - Parallel sparse LU and Cholesky solvers;</div>
<div class="line"><a class="reference external" href="http://pastix.gforge.inria.fr/">http://pastix.gforge.inria.fr/</a></div>
</div>
</li>
<li><div class="line-block">
<div class="line">PTScotch - A graph partitioning package;</div>
<div class="line"><a class="reference external" href="http://www.labri.fr/Perso/~pelegrin/scotch/">http://www.labri.fr/Perso/~pelegrin/scotch/</a></div>
</div>
</li>
<li><div class="line-block">
<div class="line">SPAI - for parallel sparse approximate inverse preconditioning;</div>
<div class="line"><a class="reference external" href="https://cccs.unibas.ch/lehre/software-packages/">https://cccs.unibas.ch/lehre/software-packages/</a></div>
</div>
</li>
<li><div class="line-block">
<div class="line">SuiteSparse - sequential sparse solvers, see page , developed by
Timothy A. Davis;</div>
<div class="line"><a class="reference external" href="http://faculty.cse.tamu.edu/davis/suitesparse.html">http://faculty.cse.tamu.edu/davis/suitesparse.html</a></div>
</div>
</li>
<li><div class="line-block">
<div class="line">SUNDIALS/CVODE - see page , parallel ODE integrator;</div>
<div class="line"><a class="reference external" href="https://computation.llnl.gov/projects/sundials">https://computation.llnl.gov/projects/sundials</a></div>
</div>
</li>
<li><div class="line-block">
<div class="line">SuperLU and SuperLU_Dist - see page , the efficient sparse LU codes
developed by Jim Demmel, Xiaoye S. Li, and John Gilbert;</div>
<div class="line"><a class="reference external" href="https://crd-legacy.lbl.gov/~xiaoye/SuperLU">https://crd-legacy.lbl.gov/~xiaoye/SuperLU</a></div>
</div>
</li>
<li><div class="line-block">
<div class="line">STRUMPACK - the STRUctured Matrix Package;</div>
<div class="line"><a class="reference external" href="https://portal.nersc.gov/project/sparse/strumpack/">https://portal.nersc.gov/project/sparse/strumpack/</a></div>
</div>
</li>
<li><div class="line-block">
<div class="line">Triangle and Tetgen - mesh generation packages;</div>
<div class="line"><a class="reference external" href="https://www.cs.cmu.edu/~quake/triangle.html">https://www.cs.cmu.edu/~quake/triangle.html</a></div>
<div class="line"><a class="reference external" href="http://wias-berlin.de/software/tetgen/">http://wias-berlin.de/software/tetgen/</a></div>
</div>
</li>
<li><div class="line-block">
<div class="line">Trilinos/ML - Sandia’s main multigrid preconditioning package;</div>
<div class="line"><a class="reference external" href="https://trilinos.github.io/">https://trilinos.github.io/</a></div>
</div>
</li>
<li><div class="line-block">
<div class="line">Zoltan - graph partitioners from Sandia National Laboratory;</div>
<div class="line"><a class="reference external" href="http://www.cs.sandia.gov/zoltan/">http://www.cs.sandia.gov/zoltan/</a></div>
</div>
</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>Emacs editor</p></li>
<li><p><a class="reference external" href="https://git-scm.com/">Git</a> revision control system</p></li>
<li><p>Python</p></li>
</ul>
<p>PETSc documentation has been generated using</p>
<ul class="simple">
<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>
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