CarpetLib: Implement using MPI_Waitall for communicating

Add a parameter CarpetLib::use_waitall that switches from using a
series of MPI_Wait statements to using a single MPI_Waitall
statement.  This might improve performance on many processors.

darcs-hash:20041124235118-891bb-034efea054db236a187022b1858e4574da867fa3.gz

1 files changed, 11 insertions, 4 deletions

diff --git a/Carpet/CarpetLib/src/data.hh b/Carpet/CarpetLib/src/data.hh
index f8f184050..524f77c4c 100644
--- a/Carpet/CarpetLib/src/data.hh
+++ b/Carpet/CarpetLib/src/data.hh
@@ -78,11 +78,18 @@ public:
 
   // Processor management
   virtual void change_processor (comm_state<D>& state,
-                                 const int newproc, void* const mem=0);
+                                 const int newproc,
+                                 void* const mem=0);
 private:
-  virtual void change_processor_recv (const int newproc, void* const mem=0);
-  virtual void change_processor_send (const int newproc, void* const mem=0);
-  virtual void change_processor_wait (const int newproc, void* const mem=0);
+  virtual void change_processor_recv (comm_state<D>& state,
+                                      const int newproc,
+                                      void* const mem=0);
+  virtual void change_processor_send (comm_state<D>& state,
+                                      const int newproc,
+                                      void* const mem=0);
+  virtual void change_processor_wait (comm_state<D>& state,
+                                      const int newproc,
+                                      void* const mem=0);
 public:
 
   // Accessors