From 1e889c93b8dee7d363f2e2db23c4dd1f008ec20f Mon Sep 17 00:00:00 2001
From: Peter Boyle <paboyle@ph.ed.ac.uk>
Date: Sat, 15 Jun 2019 08:23:26 +0100
Subject: [PATCH] Insert a GPU synchronise

---
 Grid/stencil/Stencil.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Grid/stencil/Stencil.h b/Grid/stencil/Stencil.h
index f7b31fed..1015e132 100644
--- a/Grid/stencil/Stencil.h
+++ b/Grid/stencil/Stencil.h
@@ -511,8 +511,9 @@ public:
       HaloGatherDir(source,compress,point,face_idx);
     }
     face_table_computed=1;
-    
     assert(u_comm_offset==_unified_buffer_size);
+
+    accelerator_barrier();
     halogtime+=usecond();
   }
  
@@ -972,7 +973,6 @@ public:
     assert(shift>=0);
     assert(shift<fd);
 
-
     int buffer_size = _grid->_slice_nblock[dimension]*_grid->_slice_block[dimension];
     
     int cb= (cbmask==0x2)? Odd : Even;