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| author | Erik Schnetter <schnetter@cct.lsu.edu> | 2006-09-27 20:32:00 +0000 |
|---|---|---|
| committer | Erik Schnetter <schnetter@cct.lsu.edu> | 2006-09-27 20:32:00 +0000 |
| commit | cd08a9959f025c7f76cb5ee7302fe21792d73799 (patch) | |
| tree | b273927a27b711d8b7e0b3a962942a7cbe4878d7 /Carpet/CarpetWeb/version-3.html | |
| parent | 44a2924328dfd3640d79d6f29853f017d077db62 (diff) | |
CarpetWeb: Announce upcoming version 3
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diff --git a/Carpet/CarpetWeb/version-3.html b/Carpet/CarpetWeb/version-3.html new file mode 100644 index 000000000..59c20c927 --- /dev/null +++ b/Carpet/CarpetWeb/version-3.html @@ -0,0 +1,156 @@ +<?xml version="1.0" encoding="ISO-8859-15"?> +<!DOCTYPE html + PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" + "DTD/xhtml1-transitional.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> + <head> + <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-15" /> + <title>Carpet Version 3</title> + <script src="http://www.google-analytics.com/urchin.js" type="text/javascript"> + </script> + <script type="text/javascript"> + _uacct = "UA-97002-1"; + urchinTracker(); + </script> + </head> + + <body> + <h1>Carpet Version 3</h1> + + <p>The release branch for Carpet Version 3 was created on + September 26, 2006. Version 3 has several major improvements over + version 2; all users of version 2 should consider updating.</p> + + <p>Special thanks appertain to Luca Baiotti, Ian Hawke, Christian + D. Ott, Thomas Radke, Jonathan Thornburg, and Steve White for + their contributions.</p> + + <p>Here is a list of the major changes:</p> + + <h3>Grid hierarchy</h3> + <ul> + <li>Carpet has improved support for dynamic regridding. Thorn + CarpetRegrid can automatically coalesce overlapping regions, + which simplfies specifying refined regions. A new Cactus + schedule bin <b>preregrid</b> was introduced where thorns can + schedule routines that decide on a new grid structure.</li> + <li>It is not necessary any more to allocate all storage for all + variables at all times, i.e., it is now reasonably possible to + honour the <b>STORAGE</b> statements in the schedule. This is + done by the parameter + setting <b>Carpet::enable_all_storage = no</b>, and + it can unsurprisingly reduce the memory requirements + considerably. This is not yet the default setting.</li> + <li>Carpet checks whether the grid hierarchy is properly nested. + This is only an advice, not a requirement, since a not + properly nested grid hierarchy is technically still well + defined. It is sometimes surprising how many grid points per + level are required for proper nesting.</li> + <li>Checkpointing stores the grid hierarchy, so that it can be + automatically faithfully recovered. This requires the + parameter + settings <b>Carpet::regrid_during_recovery = no</b> + and <b>CarpetIOHDF5::use_grid_structure_from_checkpoint = yes</b>. + This is not yet the default setting.</li> + </ul> + + <h3>Performance</h3> + <ul> + <li>Carpet scales better on multiple processors.</li> + <li>Several of Carpet's internal administrative calculations are + faster</li> + <li>Carpet has timing and memory statistics, which help users + determine on what parts of a simulation the time is spent</li> + </ul> + + <h3>I/O</h3> + <ul> + <li>A new thorn CarpetIOBasic replaces the old IOBasic, + providing more convenient screen output. It performs global + reductions over the whole grid hierarchy instead of one + reduction per refinement level.</li> + <li>CarpetIOASCII produces one-dimensional output along the + diagonal.</li> + <li>Each output file is annotated with a unique build id and a + unique simulation id, so that files can be associated with the + run and source tree that produced them. This requires thorn + Formaline to be active.</li> + </ul> + + <h3>Interpolation</h3> + <ul> + <li>CarpetLib provides WENO (Weighted Essentially + Non-Oscillatory) prolongation operators for hydrodynamics + simulations. CarpetLib had already support for TVD and ENO + operators, in addition to the standard Lagrange + operators.</li> + <li>CarpetInterp supports using non-standard (but still uniform) + coordinate systems, allowing interpolating in grid arrays. + Several serious errors in CarpetInterp were corrected.</li> + </ul> + + <h3>Multi-patch and multi-model</h3> + <ul> + <li>Checkpointing and recovery with multiple grid patches was + corrected.</li> + <li>Different grid patches can have different (local) grid + spacings and different numbers of grid points.</li> + <li>There is initial support for multi-model simulations. These + are essentially independent simulations which are coupled only + e.g. through a boundary condition between two disjoint domains + containing different physical systems.</li> + </ul> + + <h3>Documentation and utilities</h3> + <ul> + <li>Carpet's documentation was improved. In particular, the + schedule skeleton is now documented, describing which schedule + bins and which other actions occur in what order.</li> + <li>A variety of utilities for post-processing Carpet output + were added or improved, e.g. for convertion Carpet ASCII + output to the ygraph format, or for extracting certain pieces + of HDF5 files.</li> + </ul> + + <h3>Smallish things</h3> + <ul> + <li>Many small errors were corrected</li> + <li>Many small features were added</li> + <li>Some error messages were improved</li> + <li>Many superfluous warning messages were removed</li> + <!-- Shameless self-advertising --> + <li>Carpet is now used by eleven relativity groups in the world.</li> + <!-- and it was the base for 15 scientific publications and at + least 2 PhD theses --> + <li>I'm looking for someone to make these web pages look + nicer.</li> + </ul> + + <hr /> + + <p>Go back to the <a href=".">Carpet home page</a>.</p> + + <hr /> + + <p> + <a href="http://www.xemacs.org/About/created.html"><img + src="cbxSmall.jpg" alt="Created with XEmacs!" height="36" + width="100" /></a> + + <a href="http://www.anybrowser.org/campaign/"><img + src="logoab8.png" alt="Best Viewed With Any Browser" height="31" + width="88" /></a> + + <a href="http://validator.w3.org/check?uri=referer"><img + src="http://www.w3.org/Icons/valid-xhtml10" + alt="Valid XHTML 1.0!" height="31" width="88" /></a> + </p> + + <hr /> + <address><a href="mailto:schnetter@uni-tuebingen.de">Erik Schnetter</a></address> +<!-- Created: Wed Sep 27 2006 --> +<!-- hhmts start --> +Last modified: Wed Sep 27 2006 +<!-- hhmts end --> + </body> +</html> |