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<title>PLAPACK </title>

<h1> Parallel Linear Algebra Package (PLAPACK) </h1>


<H3><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><img SRC="http://www.cs.utexas.edu/users/sammy/cgi/spy?/users/rvdg/logs/plapack">
Number of accesses to this page since Sunday Aug. 4, 1996:
<!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><img ALIGN=bottom src="http://www.cs.utexas.edu/pub/cgi/number.xbm/www/users/rvdg/cgi/wwwlog.plapack.val"></H3>

<h2> Please sign our  <!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><a href="http://www.cs.utexas.edu/users/sammy/pla/sign-in"> guestbook </a> so we can keep you informed </h2>

The <b> PLAPACK </b> project investigates interfaces and implementations
of dense and sparse parallel linear algebra libraries.  
This project is unique in that it concentrates on convenient
interfaces.  It is our conclusion that this can only be 
achieved by distributing the <b> vectors </b> in a linear
system first, which then induces the <b> matrix </b> distribution.
Justification for this lies in the fact that the physical problem
leads to a mathematical model, involving two spaces and an operator.
It is these spaces that represent the problem.  Discretization
of the mathematical model leads to vectors, which hold the
solution and right hand side, 
and the matrix, which is the discretized operator.
<b> Physically Based Matrix Distribution </b> is based on these
ideas.  The interface that allows information from the 
physical problem and/or mathematical model to be passed down
to the library is called the <b> Physically Distributed Matrix Interface </b>.

If you would like to be kept informed of progress on this library, please
sign our <!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><a href="http://www.cs.utexas.edu/users/sammy/pla/sign-in"> guestbook.
</a>


<hr>

The <b> SL_library </b> is a prototype implementation for PLAPACK.
Here <b> SL </b> stands for <b>S</b>imple <b>L</b>ibrary.  
It was created in part 
to investigate techniques required for the PLAPACK library,
and in part to provide an infrastructure for the course
<!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><a href="http://www.cs.utexas.edu/users/rvdg/395T.96">
"Parallel Techniques for Numerical Algorithms" </a>
taught by
<!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><a href="http://www.cs.utexas.edu/users/rvdg"> Robert van de Geijn </a> at
the University of Texas at Austin.
<p>

<hr> 
<!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><a href="http://www.cs.utexas.edu/users/rvdg/plapack/Guide.ps">
<h2> Parallel Linear Algebra Package (PLAPACK): <br>
Release R0.1 (Beta) Users' Guide </h2> </a> 
Manuscript in preparation, Aug. 1 version.

<!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><a href="http://www.cs.utexas.edu/users/rvdg/plapack/mit.ps">
<h2> Using PLAPACK: Parallel Linear Algebra Package </h2>
</a> 

PLAPACK Users' Guide, to be published by MIT Press in 1997.
Sept. 10, 1996 version.

<b> In preparation.  Notice that we are changing a number of
calling sequences. Due to the inconsistency between the currently
available library and this guide, which reflects the next release,
it is important to sign our <!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><a href="http://www.cs.utexas.edu/users/sammy/pla/sign-in"> guestbook, </a> so we can keep
you informed. </b>

<hr>

<!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><a href="http://www.cs.utexas.edu/users/gunnels/SL_Library/library.html">
<h2> SL_library: reference manual </h2> </a>

John Gunnels now maintains this manual 

<hr>

<!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><a href="http://www.cs.utexas.edu/users/rvdg/plapack/performance.html">
<h2> Some recent performance numbers </h2> </a>

<hr>

<h2> Related reading </h2>

<hr> 

<h2> Unpublished Manuscript </h2>

<ul>
<li> 
Almadena Chtchelkanova,
Carter Edwards,
John Gunnels,
Robert van de Geijn,
<!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><a href="http://www.cs.utexas.edu/users/rvdg/papers/TR2.ps">
"A Comprehensive Approach to Parallel Linear 
Algebra Libraries," </a> Draft Oct. 9, 1995. <br>
Currently 75 pages.  Incomplete manuscript
<p>
</ul>

<hr>

<h2>PLAPACK Working Notes </h2>
<ol>
<li> C. Edwards, P. Geng, A. Patra, and R. van de Geijn, 
<!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><a href="http://www.cs.utexas.edu/users/rvdg/papers/pbmd.ps">
"Parallel Matrix
Decompositions: have we been doing it all wrong?" </a>
PLAPACK Working Note #1,
TR-95-39, Department of Computer Sciences, University of
Texas, Oct. 1995. 
<p>
<li>
Robert van de Geijn and Jerrell Watts
<!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><a href="http://www.cs.utexas.edu/users/rvdg/abstracts/SUMMA.html"> "SUMMA: Scalable Universal Matrix Multiplication Algorithm,"</a> PLAPACK Working Note #2,
Department of Computer Sciences, The Unversity of
Texas, TR-95-13, April 1995. <br>
Also: LAPACK Working Note #96 , May 1995.  <br>
Journal version: Concurrency: Practice and Experience, to appear.
<p>
<li>
Brian Grayson and Robert van de Geijn
<!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><a href="http://www.cs.utexas.edu/users/rvdg/abstracts/SSUMMA.PPL.html"> "A High Performance Parallel
Strassen Implementation,"</a> PLAPACK Working Note #3,
<i> Parallel Processing Letters, </i> to appear.
<p>
<li> 
Almadena Chtchelkanova, John Gunnels, Greg Morrow,
James Overfelt,
Robert A. van de Geijn,
<!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><a href="http://www.cs.utexas.edu/users/rvdg/papers/sB_BLAS.ps">
"Parallel Implementation of  BLAS:
General Techniques for Level 3 BLAS," </a> PLAPACK Working Note #4,
TR-95-40, Department of Computer Sciences, University of
Texas, Oct. 1995. <br>
Journal version: Concurrency: Practice and Experience, <b> to appear</b>.
<p>
<li>
Almadena Chtchelkanova,
Carter Edwards,
John Gunnels,
Greg Morrow,
James Overfelt,
Robert van de Geijn,
<!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><a href="http://www.cs.utexas.edu/users/rvdg/abstracts/SC96.html"> "Towards Usable and Lean Parallel Linear Algebra Libraries," </a> PLAPACK Working Note #5,
TR-96-09, Department of Computer Sciences, University of Texas,
May 1996. <br>
Conference version: Supercomputing 96, <b> submitted</b>.
<p>
</ol>
<p>

<hr>

<h2> Overhead foils used at the 
<!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><a href="http://www.netlib.org/utk/papers/sblas-meeting.html">BLAS workshop</a> in Tennessee </h2>

<ul>
<li> Almadena Chtchelkanova, Carter Edwards, John Gunnels, and Robert van de Geijn,
<!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><a href="http://www.cs.utexas.edu/users/rvdg/papers/BLAS95.1.ps"> A Comprehensive Approach to Parallel Linear Algebra Libraries</a>, presented by Robert van de Geijn.
<p>
<li> Carter Edwards and Robert van de Geijn, <!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><a href="http://www.ticam.utexas.edu/~carter/pdmi_pres.ps.Z"> Physically Distributed Matrix Interface </a> presentated by Carter Edwards.
<p>
<li> Almadena Chtchelkanova, John Gunnels, Greg Morrow, James Overfelt,
   Robert A. van de Geijn, <!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><a href="http://www.cs.utexas.edu/users/rvdg/papers/BLAS95.3.ps"> Parallel Implementation of BLAS: General
   Techniques for Level 3 BLAS</a>,
presentated by Almadena Chtchelkanova.
<p>
</ul>

<h2> Other Overhead foils </h2>

<ul>
<li>
Robert A. van de Geijn,
<!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><a href="http://www.cs.utexas.edu/users/rvdg/papers/sandia.ps">
Sandia Slides </a>
<p>
<li>
<!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><a href="http://www.cs.utexas.edu/users/gunnels/SL_Library/rvdg_presents/index.html">
Color Powerpoint slides </a>
<p>
</ul>

<hr> 

<h2> Sponsors </h2>

This project is being funded in part by 
<ul>
<li>
The <!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><a href="http://www.mcs.anl.gov/Projects/PRISM/"> PRISM </a>
(Parallel Research on Invariant Subspace Methods)
project, under ARPA grant P-95006.
<p>
<li>
<!WA24><!WA24><!WA24><!WA24><!WA24><!WA24><!WA24><!WA24><a href="http://farside.gsfc.nasa.gov/ESS/">
The NASA High Performance Computing and Communications
Program's Earth and Space Sciences Project </a>
under NRA Grant NAG5-2497.
<p>
<li>
<!WA25><!WA25><!WA25><!WA25><!WA25><!WA25><!WA25><!WA25><a href="http://farside.gsfc.nasa.gov/ESS/">
The NASA High Performance Computing and Communications
Program's Earth and Space Sciences Project 
</a>
under NRA Grant NAG5-2511.
<ul>
<li>
Title: Application of Massively Parallel Processing Techniques to Least Squares
Problems in Satellite Gravity Gradiometry 
<li>
Investigators: Dr. Bob E. Schutz, Dr. Srinivas Bettadpur, Gregory A. Baker 
</ul>
<p>
</ul>

<h2> Meet the Team </h2>
<ul>
<li> 
<!WA26><!WA26><!WA26><!WA26><!WA26><!WA26><!WA26><!WA26><a href="http://www.ticam.utexas.edu/users/philip"> Philip Alpatov </a>
<li> 
<!WA27><!WA27><!WA27><!WA27><!WA27><!WA27><!WA27><!WA27><a href="http://www.ae.utexas.edu/~baker"> Greg Baker </a>
<li> 
<!WA28><!WA28><!WA28><!WA28><!WA28><!WA28><!WA28><!WA28><a href="http://www.cs.utexas.edu/users/almad"> Almadena Chtchelkanova </a>
<li> 
<!WA29><!WA29><!WA29><!WA29><!WA29><!WA29><!WA29><!WA29><a href="http://www.ticam.utexas.edu/users/jeaton"> Joe Eaton </a>
<li> 
<!WA30><!WA30><!WA30><!WA30><!WA30><!WA30><!WA30><!WA30><a href="http://www.ticam.utexas.edu/~carter"> Carter Edwards </a>
<li> 
<!WA31><!WA31><!WA31><!WA31><!WA31><!WA31><!WA31><!WA31><a href="http://www.ticam.utexas.edu/users/murthy"> Murthy Guddati </a>
<li> 
<!WA32><!WA32><!WA32><!WA32><!WA32><!WA32><!WA32><!WA32><a href="http://www.cs.utexas.edu/users/gunnels"> John Gunnels </a>
<li> 
<!WA33><!WA33><!WA33><!WA33><!WA33><!WA33><!WA33><!WA33><a href="http://www.cs.utexas.edu/users/sammy"> Sam Guyer </a>
<li> 
<!WA34><!WA34><!WA34><!WA34><!WA34><!WA34><!WA34><!WA34><a href="http://www.ticam.utexas.edu/~ken"> Ken Klimkowski </a>
<li> 
<!WA35><!WA35><!WA35><!WA35><!WA35><!WA35><!WA35><!WA35><a href="http://www.cs.utexas.edu/users/lin"> Calvin Lin </a>
<li> 
<!WA36><!WA36><!WA36><!WA36><!WA36><!WA36><!WA36><!WA36><a href="http://www.ph.utexas.edu/~morrow/home.html"> Greg Morrow</a>
<li>
<!WA37><!WA37><!WA37><!WA37><!WA37><!WA37><!WA37><!WA37><a href="http://www.ae.utexas.edu/~nagel"> Peter Nagel </a>
<li> 
<!WA38><!WA38><!WA38><!WA38><!WA38><!WA38><!WA38><!WA38><a href="http://www.ma.utexas.edu/users/overfelt"> James Overfelt </a>
<li> 
<!WA39><!WA39><!WA39><!WA39><!WA39><!WA39><!WA39><!WA39><a href="http://www.ticam.utexas.edu/~pal"> Michelle Pal </a>
<li>
<!WA40><!WA40><!WA40><!WA40><!WA40><!WA40><!WA40><!WA40><a href="http://www.cs.utexas.edu/users/rvdg"> Robert van de Geijn </a>
</ul>

<hr>