[cig-commits] r15608 - short/3D/PyLith/trunk/doc/releasenotes

[brad at geodynamics.org]

Author: brad
Date: 2009-08-27 11:58:21 -0700 (Thu, 27 Aug 2009)
New Revision: 15608

Modified:
   short/3D/PyLith/trunk/doc/releasenotes/announce_v1.4.2.txt
Log:
Added more info to release notes.

Modified: short/3D/PyLith/trunk/doc/releasenotes/announce_v1.4.2.txt
===================================================================
--- short/3D/PyLith/trunk/doc/releasenotes/announce_v1.4.2.txt	2009-08-27 18:17:00 UTC (rev 15607)
+++ short/3D/PyLith/trunk/doc/releasenotes/announce_v1.4.2.txt	2009-08-27 18:58:21 UTC (rev 15608)
@@ -4,14 +4,17 @@
 code designed to solve dynamic elastic problems and quasi-static
 viscoelastic problems in tectonic deformation.
 
-This release fixes several bugs that in the v1.4.0 and v1.4.1
-releases, including (1) parameters in the power-law rheology are now
-consistent with laboratory experiments, (2) fixed implementation
-errors in point forces, (3) increased the stable time step for
-implicit time-stepping with linear viscoelastic models from 0.1 times
-the Maxwell time to 0.2 times the Maxwell time based on accuracy
-tests, and (4) eliminated several memory leaks associated with output
-and running in parallel.  
+This release fixes several bugs in PyLith v1.4.0 and v1.4.1. The
+changes include (1) parameters in the power-law rheology are now
+consistent with laboratory experiments, (2) errors in the
+implementation of point forces have been fixed, (3) the stable time
+step for implicit time-stepping with linear viscoelastic models has
+been increased from 0.1 times the Maxwell time to 0.2 times the
+Maxwell time based on accuracy tests, (4) the preconditioner is only
+recomputed when necessary, (5) some unnecessary allocation and
+deallocations were removed through the use of persistent data
+structures, and (6) several memory leaks associated with output and
+running in parallel have been eliminated.
 
 We strongly recommend all users of previous PyLith releases to switch
 to this latest release. Switching from v1.4.0 or v1.4.1 to v1.4.2 only
@@ -39,7 +42,7 @@
     user manual for details.
 
   - Numerous errors in the Python and SWIG point source implementation
-    were fixed. Point forces did not work in v1.4.1.
+    were fixed. Point forces did not work in v1.4.0 and v1.4.1.
 
   - Based on accuracy tests the stable time step for implicit
     time-stepping for the Maxwell viscoelastic models has been
@@ -47,5 +50,9 @@
     factor in the adaptive time-stepping has been corresponding
     adjusted to provide a time step of 0.1 times the Maxwell time.
 
+  - The preconditioner for the linear solver is only recomputed when
+    the sparse matrix has been changed. This reduces runtime and
+    unnecessary creation and destruction of the sparse matrix.
+
   - Several memory leaks associated with output and running in
     parallel have been fixed.