Added functions for pinning memory that is sent over the network. TODO pack to and from pinned memory selectively (currently P2P results are overwritten with data in pinned memory)

src/core/kernels/kernels.h

@@ -5,12 +5,17 @@
 #include <mpi.h>
 
 #define AC_MPI_UNIDIRECTIONAL_COMM (0)
+#define AC_MPI_RT_PINNING (1)
 #endif // AC_MPI_ENABLED
 
 typedef struct {
     int3 dims;
     AcReal* data;
 
+#if (AC_MPI_ENABLED && AC_MPI_RT_PINNING)
+    AcReal* data_pinned;
+#endif // (AC_MPI_ENABLED && AC_MPI_RT_PINNING)
+
 #if (AC_MPI_ENABLED && AC_MPI_UNIDIRECTIONAL_COMM)
     MPI_Win win; // MPI window for RMA
 #endif           // (AC_MPI_ENABLED && AC_MPI_UNIDIRECTIONAL_COMM)