diff --git a/hostname b/hostname
new file mode 100644
index 0000000000000000000000000000000000000000..92d4a1958953b6e45f81deeb148867766838186b
--- /dev/null
+++ b/hostname
@@ -0,0 +1,5 @@
+172.31.65.212
+172.31.79.254
+172.31.68.110
+172.31.79.57
+172.31.75.79s
diff --git a/openmpi-script.sh b/openmpi-script.sh
index a80c31ae53c7e7ca583696f5f0cadcd7651c2be7..7ddfef74ad80d6f7f469143f6a1ea44a231b15ab 100755
--- a/openmpi-script.sh
+++ b/openmpi-script.sh
@@ -6,6 +6,6 @@ fi
 input=$1
 filename=`basename $1`
 
-cat $1 | ./src/MST_OpenMPI > output_mp/tmp
-sed '$d' output_mp/tmp > output_mp/$filename
-rm -f output_mp/tmp
+cat $1 | mpirun --hostfile hostname -np 5 ./src/MST_OpenMPI < $input > output_mpi/tmp
+sed '$d' output_mpi/tmp > output_mpi/$filename
+rm -f output_mpi/tmp
\ No newline at end of file