* major changes to driver routines to find multiple horizons in parallel

  across multiple processors -- see src/driver/README.parallel for details
* drop convergence checks on ||Delta_h|| in param.ccl because they don't
  fit well with parallelization changes

==> With this changes, AHFinderDirect is now (I think)
    multiprocessor-ready!!


git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinAnalysis/AHFinderDirect/trunk@946 f88db872-0e4f-0410-b76b-b9085cfa78c5

1 files changed, 17 insertions, 0 deletions

diff --git a/README.library b/README.library
index 2b7fad0..93f2d3c 100644
--- a/README.library
+++ b/README.library
@@ -5,6 +5,9 @@ $Header$
 By default this thorn doesn't use any external libraries, and you
 can ignore the instructions in this file.
 
+
+Using the LAPACK and BLAS Libraries
+===================================
 However, if this thorn is configured to use the LAPACK and BLAS
 libraries (see README for details), then you need to configure Cactus
 to use these libraries; this file describes how to do this.
@@ -54,3 +57,17 @@ or as assignments in your ~/.cactus/config file,
    LAPACK=yes
    LAPACK_EXTRA_LIBS=g2c
    LAPACK_EXTRA_LIB_DIRS=/usr/lib/gcc-lib/i386-redhat-linux/2.96
+
+
+Compiler Version Compatability
+==============================
+All of Cactus -- including any external libraries -- need not be
+compiled with the same compilers, but the compilers must be link-compatible.
+In practice this isn't usually a problem.  However, as an example of what
+*not* to do, consider using libraries compiled with a gcc 2.* version
+(e.g. the system default libraries on many GNU/Linux distributions as
+of late 2002), combined with thorns compiled with a gcc 3.* version.
+gcc 2.* and 3.* are *not* link-compatible, so if you're lucky this
+combination will give all sorts of wierd errors in linking.  If you're
+unlucky it will link ok but then crash (or even worse, just give wrong
+results) at run-time.