Send mail to: mgnet@cs.yale.edu for the digests or bakeoff mgnet-requests@cs.yale.edu for comments or help Current editor: Craig Douglas douglas-craig@cs.yale.edu *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Multigrid Bakeoff The pupose of the bakeoff is to try to determine a collection of interesting problems and shed light on how to solve them better. While multigrid methods are emphasized, any algorithm that solves one of these problems is fair game. The codes participating will probably not be able to solve all of the problems. However, all problems shoud be solvable by more than one code. Otherwise, the problem is too specialized, hard, or uniteresting after all. Some of the codes are research codes and others are production quality ones. A distinction will be made between these classes. *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Mail and the Software Repository All mail should be sent through mgnet@cs.yale.edu. It will be sent out quite quickly to the active bakeoff participants and digested for others. There is an anonymous ftp repository for mgnet at casper.cs.yale.edu. Change directory to mgnet and get the files README.mgnet and INDEX.mgnet to see what is really there. *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Problems Details will be forthcoming. Actually, problems will be forthcoming. So far, the only 2 problems advertised are the Poisson equation on the unit square and cube, Dirichlet boundary conditions, and solutions u(x,y)=x*exp(xy)*sin(pi*x)*sin(pi*y) and u(x,y,z)=x*exp(xyz)*sin(pi*x)*sin(pi*y)*sin(pi*z). Discretization of these by central differences, elements, and volumes on uniform grids could get interesting. For uniform grids, the number of unknowns should be large (say about 256 squared for the 2D problem and about 32 or 64 cubed for the 3D problem). For nonuniform grids or alternative methods, an error reduction will be provided (soon, ... really). Such trivial problems are not really wanted, but something almost everyone can solve and are well known in the literature should be included just as a point of reference. *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Timing of Codes Timing routines will be supplied. Everyone should use the same one on a given architecture so that we are comparing apples with apples instead of apples with oranges. I already have ones for a large number of machines. However, it would not hurt to send me a copy of yours for your favorite machine. When in doubt, send me a message (douglas-craig@cs.yale.edu). *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Bakeoff Software Participants Software packages listed below are participating. The sponsor is also listed. Packages with a * to the left of the package name are stored in the mgnet anonymous ftp area on casper.cs.yale.edu. * MADPACK Sponsor: Craig Douglas (version 2) E-mail: douglas-craig@cs.yale.edu or bells@watson.ibm.com Status: Public domain, research code Updated: April 27, 1991 *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Bakeoff Human Participants (Active and Passive) Anyone with a * to the left of their name is active. This will be added as people demonstrate they are active. The distinction below by region is solely to keep the mailing list I have at Yale easier to manage and not for any other purpose. North America Dinshaw Balasa dbalsara@ncsa.uiuc.edu Victor Bandy vbandy@copper.denver.colorado.edu Maurice Benson mwbenson@thunder.lakeheadu.ca * Craig Douglas bells@watson.ibm.com * Paul Frederickson pof@riacs.edu Charles Tong chtong@snll-arpagw.llnl.gov Sue Haupt haupt@ncar.ucar.edu Mike Heroux mamh@cray.com Jan Mandel jmandel@copper.denver.colorado.edu Oliver McBryan mcbryan@boulder.colorado.edu Steve McCormick smccormi@copper.denver.colorado.edu Steven McKay mckay@dt.uh.edu Naomi Naik nanaik@vassar.bitnet Steve Schaffer schaffer@nmt.edu Ridgway Scott scott@uh.edu Ray Tuminaro tuminaro@cs.sandia.gov John Van Rosendale john@icase.edu Shangyou Zhang szhang@math.udel.edu Europe John Carrol carrollj%vax2.nihed.ie@uunet.uu.net Ute Gaertel gmap15@dbngmd21.bitnet Mathias Meinke kumein@dacth11.bitnet Klaus Stuben gmap02@dbngmd21.bitnet Rune Teigland resrt@mi.uib.no Chris Thompson thompson@bsc.no Eric van der Maarel maarel@cwi.nl Paul de Zeeuw pauldz@cwi.nl Denis Willams williamsd@dcu.ie Middle East Achi Brandt mabrandt@weizmann.bitnet *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*