From 5460dec57150cfee432bb79de47eac264d72efa0 Mon Sep 17 00:00:00 2001
From: Erik Schnetter <schnetter@gmail.com>
Date: Mon, 29 Jul 2013 18:14:21 -0700
Subject: Carpet: Support group tag "map0group"

This tag indicates that this variable group should have storage only on map 0.
---
 Carpet/Carpet/src/Storage.cc |  4 ++++
 Carpet/Carpet/src/carpet.hh  |  3 +++
 Carpet/Carpet/src/helpers.cc | 26 +++++++++++++++++++++++---
 3 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/Carpet/Carpet/src/Storage.cc b/Carpet/Carpet/src/Storage.cc
index f8f6f3516..eee79cbcb 100644
--- a/Carpet/Carpet/src/Storage.cc
+++ b/Carpet/Carpet/src/Storage.cc
@@ -168,7 +168,11 @@ namespace Carpet {
             // Set the new number of active time levels
             groupdata.AT(group).activetimelevels.AT(ml).AT(rl) = tls[n];
             
+            // Allocate storage only on map 0?
+            const bool ismap0group = IsMap0Group(group);
+            
             for (int m=0; m<(int)arrdata.AT(group).size(); ++m) {
+              if (ismap0group) continue;
               for (int var=0; var<gp.numvars; ++var) {
 #ifdef CCTK_HAVE_CONTIGUOUS_GROUPS
                 bool const contiguous = gp.contiguous;
diff --git a/Carpet/Carpet/src/carpet.hh b/Carpet/Carpet/src/carpet.hh
index f9e3fb898..8c802ab0b 100644
--- a/Carpet/Carpet/src/carpet.hh
+++ b/Carpet/Carpet/src/carpet.hh
@@ -84,6 +84,9 @@ namespace Carpet {
   // Error output
   void UnsupportedVarType (int vindex);
   
+  // Check for a map0group
+  bool IsMap0Group(int gindex);
+  
 } // namespace Carpet
 
 #endif // !defined(CARPET_HH)
diff --git a/Carpet/Carpet/src/helpers.cc b/Carpet/Carpet/src/helpers.cc
index 6938fd658..a34fd974c 100644
--- a/Carpet/Carpet/src/helpers.cc
+++ b/Carpet/Carpet/src/helpers.cc
@@ -1,6 +1,7 @@
 #include <cctk.h>
 #include <cctk_FortranString.h>
 #include <cctk_Parameters.h>
+#include <util_Table.h>
 
 #include <algorithm>
 #include <cassert>
@@ -548,11 +549,30 @@ namespace Carpet {
   void UnsupportedVarType (const int vindex)
   {
     assert (vindex>=0 and vindex<CCTK_NumVars());
-    CCTK_VWarn
-      (0, __LINE__, __FILE__, CCTK_THORNSTRING,
+    CCTK_VError
+      (__LINE__, __FILE__, CCTK_THORNSTRING,
        "Carpet does not support the type of the variable \"%s\".\n"
        "Either enable support for this type, "
        "or change the type of this variable.", CCTK_FullName(vindex));
   }
-
+  
+  
+  
+  bool IsMap0Group(const int gindex)
+  {
+    assert(gindex>=0 and gindex<CCTK_NumGroups());
+    const int table = CCTK_GroupTagsTableI(gindex);
+    assert(table>=0);
+    CCTK_INT map0group;
+    int status = Util_TableGetInt(table, &map0group, "map0group");
+    if (status==UTIL_ERROR_TABLE_NO_SUCH_KEY) {
+      map0group = false;
+      status = 1;
+    }
+    if (status!=1) {
+      CCTK_ERROR("illegal table value");
+    }
+    return map0group;
+  }
+  
 } // namespace Carpet
-- 
cgit v1.2.3