diff --git a/apps/imb-mpi/allreduce.sh b/apps/imb-mpi/allreduce.sh
index 59b2b45a..5cd59629 100755
--- a/apps/imb-mpi/allreduce.sh
+++ b/apps/imb-mpi/allreduce.sh
@@ -9,21 +9,30 @@ num_ranks=$(wc -l <$PBS_NODEFILE)
 case $MPI in
     impi2018)
         module load mpi/impi
-        source $MPI_BIN/mpivars.sh
+        #source $MPI_BIN/mpivars.sh
         export I_MPI_FABRICS="shm:ofa"
         export I_MPI_FALLBACK_DEVICE=0
         export I_MPI_DEBUG=4
         mpi_options="-hostfile $PBS_NODEFILE -np $num_ranks"
-        IMB_ROOT=$MPI_BIN
+        if [ -z $MPI_BIN ]; then
+            IMB_ROOT=$I_MPI_ROOT/intel64/bin
+        else
+            IMB_ROOT=$MPI_BIN
+        fi
     ;;
     impi2019)
         module load mpi/impi-2019
-        source $MPI_BIN/mpivars.sh -ofi_internal
+        #source $MPI_BIN/mpivars.sh -ofi_internal
         export I_MPI_FABRICS="shm:ofi"
         export I_MPI_FALLBACK_DEVICE=0
         export I_MPI_DEBUG=4
+        export FI_PROVIDER=mlx
         mpi_options="-hostfile $PBS_NODEFILE -np $num_ranks"
-        IMB_ROOT=$MPI_BIN
+        if [ -z $MPI_BIN ]; then
+            IMB_ROOT=$I_MPI_ROOT/intel64/bin
+        else
+            IMB_ROOT=$MPI_BIN
+        fi
     ;;
     ompi)
         module load mpi/hpcx
diff --git a/apps/imb-mpi/ringpingpong.sh b/apps/imb-mpi/ringpingpong.sh
index 01b5d8f2..0c1b32a2 100755
--- a/apps/imb-mpi/ringpingpong.sh
+++ b/apps/imb-mpi/ringpingpong.sh
@@ -7,23 +7,32 @@ module use /usr/share/Modules/modulefiles
 case $MPI in
     impi2018)
         module load mpi/impi
-        source $MPI_BIN/mpivars.sh
+        #source $MPI_BIN/mpivars.sh
         export I_MPI_FABRICS="shm:ofa"
         export I_MPI_FALLBACK_DEVICE=0
         export I_MPI_DEBUG=4
         mpi_options="-np 2 -ppn 1"
         host_option="-hosts"
-        IMB_ROOT=$MPI_BIN
+        if [ -z $MPI_BIN ]; then
+            IMB_ROOT=$I_MPI_ROOT/intel64/bin
+        else
+            IMB_ROOT=$MPI_BIN
+        fi
     ;;
     impi2019)
         module load mpi/impi-2019
-        source $MPI_BIN/mpivars.sh -ofi_internal
+        #source $MPI_BIN/mpivars.sh -ofi_internal
         export I_MPI_FABRICS="shm:ofi"
         export I_MPI_FALLBACK_DEVICE=0
         export I_MPI_DEBUG=4
+        export FI_PROVIDER=mlx
         mpi_options="-np 2 -ppn 1"
         host_option="-hosts"
-        IMB_ROOT=$MPI_BIN
+        if [ -z $MPI_BIN ]; then
+            IMB_ROOT=$I_MPI_ROOT/intel64/bin
+        else
+            IMB_ROOT=$MPI_BIN
+        fi
     ;;
     ompi)
         module load mpi/hpcx