demoperf.sh: Adding script to invoke multiple netperf

Signed-off-by: Peter Xu <[email protected]>

demoperf.sh

@@ -0,0 +1,62 @@
+# Script from Jason Wang to initiate multiple netperf instances.
+
+session=$1
+shift 1
+
+if echo $@ | grep -q "\-l [[:digit:]]*"
+then
+    l=`echo $@ | grep -o "\-l [[:digit:]]*" | awk '{print $2}'`
+else
+    l=10
+fi
+
+for i in $(seq $session)
+do
+    netperf -D 1 $@ &
+done >result 2>debug
+sleep $l
+pkill netperf
+
+# post processing
+# Examine how many sessions were launched
+nsession=$(grep MIGRATE result | wc -l)
+if [ $nsession -ne $session ]
+then
+    echo the expected sessions could not be met, expect $session get $nsession
+    echo $@
+    exit 2
+fi
+
+# Track the last netperf instance's start
+start=$(less result | grep -n MIGRATE | tail -n 1 | awk -F ':' '{print $1}')
+
+# How many lines of result file
+nlines=$(wc -l result | awk '{print $1}')
+# We only need from line $start to $end
+tail -n $(($nlines-$start)) result > result2
+
+# Track the first netperf instance's end
+end=$(less result2 | grep -En "Recv|Local" | head -n 1 | awk -F ':' '{print $1}')
+head -n $(($end-1)) result2 > result3
+
+# verify whether we could test with this parallism
+nresult=$(wc -l result3 | awk '{print $1}')
+if [ $nresult -lt $session ]
+then
+    echo "We couldn't expect this parallism, expect $session get $nresult"
+    exit 2
+fi
+
+# remove the noise from head
+niteration=$(($nresult/$session))
+tail -n $(($session*$niteration)) result3 > final_result
+
+# calculate the final result
+result=0
+for this in $(less final_result | awk '{print $3}')
+do
+    result=$(echo $result+$this | bc)
+done
+
+result=$(echo "scale=2; $result/$niteration" | bc)
+echo $result