From 5d43901b2886d5c0e94fec02e1ee02cad92b0239 Mon Sep 17 00:00:00 2001
From: Alan Gray <alangray3@gmail.com>
Date: Wed, 22 Sep 2021 07:51:07 -0700
Subject: [PATCH] Insert barrier after each GPU halo test

---
 src/gromacs/domdec/tests/haloexchange_mpi.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/gromacs/domdec/tests/haloexchange_mpi.cpp b/src/gromacs/domdec/tests/haloexchange_mpi.cpp
index 63659998ef..45b8364f80 100644
--- a/src/gromacs/domdec/tests/haloexchange_mpi.cpp
+++ b/src/gromacs/domdec/tests/haloexchange_mpi.cpp
@@ -164,6 +164,7 @@ void gpuHalo(gmx_domdec_t* dd, matrix box, HostVector<RVec>* h_x, int numAtomsTo
             gpuHaloExchange[d][pulse].communicateHaloCoordinates(box, &coordinatesReadyOnDeviceEvent);
         }
     }
+    MPI_Barrier(MPI_COMM_WORLD);
 
     GpuEventSynchronizer haloCompletedEvent;
     haloCompletedEvent.markEvent(deviceStream);
-- 
2.22.0