added half option to test 1 to all

apps/imb-mpi/ringpingpong.sh

@@ -1,5 +1,6 @@
 #!/bin/bash
 MPI=$1
+MODE=${2-ring}
 set -o pipefail
 source /etc/profile
 module use /usr/share/Modules/modulefiles
@@ -54,15 +55,31 @@ sort -u $PBS_NODEFILE > $hostlist
 # remove .internal.cloudapp.net from node names
 sed -i 's/.internal.cloudapp.net//g' $hostlist
 
-src=$(tail -n 1 $hostlist)
-# -msglog 9:10 is for 512 and 1024 bytes message size only
-for dst in $(<$hostlist); do
+case $MODE in
+    ring) # one to neighbour
+        src=$(tail -n 1 $hostlist)
+        # -msglog 9:10 is for 512 and 1024 bytes message size only
+        for dst in $(<$hostlist); do
             mpirun $host_option $src,$dst \
                 $mpi_options $numactl_options \
                 $IMB_ROOT/IMB-MPI1 PingPong -msglog 9:10 > ${src}_to_${dst}_ringpingpong.$PBS_JOBID.log
             src=$dst
-done
-
+        done
+    ;;
+    half) # one to each one way
+        cp $hostlist desthosts.$PBS_JOBID
+        for src in $(<$hostlist); do
+            # delete the first line
+            sed -i '1d' desthosts.$PBS_JOBID
+            for dst in $(<desthosts.$PBS_JOBID); do
+                mpirun $host_option $src,$dst \
+                    $mpi_options $numactl_options \
+                    $IMB_ROOT/IMB-MPI1 PingPong -msglog 9:10 > ${src}_to_${dst}_ringpingpong.$PBS_JOBID.log
+            done
+        done
+        rm desthosts.$PBS_JOBID
+    ;;
+esac
 # clean up
 rm $hostlist