diff --git a/tools/invoker/client.go b/tools/invoker/client.go
index 2a95b4f3..48dcb35a 100644
--- a/tools/invoker/client.go
+++ b/tools/invoker/client.go
@@ -53,6 +53,8 @@ const TimeseriesDBAddr = "10.96.0.84:90"
 var (
 	completed   int64
 	latSlice    LatencySlice
+	profSlice	LatencySlice
+	funcDurEnableFlag *bool
 	portFlag    *int
 	grpcTimeout time.Duration
 	withTracing *bool
@@ -64,6 +66,8 @@ func main() {
 	rps := flag.Float64("rps", 1.0, "Target requests per second")
 	runDuration := flag.Int("time", 5, "Run the experiment for X seconds")
 	latencyOutputFile := flag.String("latf", "lat.csv", "CSV file for the latency measurements in microseconds")
+	funcDurationOutputFile := flag.String("durf", "dur.csv", "CSV file for the function duration measurements in microseconds")
+	funcDurEnableFlag := flag.Bool("profile", false, "Enable function duration profiling")
 	portFlag = flag.Int("port", 80, "The port that functions listen to")
 	withTracing = flag.Bool("trace", false, "Enable tracing in the client")
 	zipkin := flag.String("zipkin", "http://localhost:9411/api/v2/spans", "zipkin url")
@@ -107,6 +111,9 @@ func main() {
 	realRPS := runExperiment(endpoints, *runDuration, *rps)
 
 	writeLatencies(realRPS, *latencyOutputFile)
+	if *funcDurEnableFlag {
+		writeFunctionDurations(*funcDurationOutputFile)
+	}
 }
 
 func readEndpoints(path string) (endpoints []*endpoint.Endpoint, _ error) {
@@ -187,6 +194,16 @@ func SayHello(address, workflowID string) {
 	if err != nil {
 		log.Warnf("Failed to invoke %v, err=%v", address, err)
 	} else {
+		//if *funcDurEnableFlag {
+		//	words := strings.Fields(response.Message)
+		//	lastWord := words[len(words)-1]
+		//	duration, err := strconv.ParseInt(lastWord, 10, 64)
+		//	if err == nil {
+		//		profSlice.Lock()
+		//		profSlice.slice = append(profSlice.slice, duration)
+		//		profSlice.Unlock()
+		//	}
+		//}
 		atomic.AddInt64(&completed, 1)
 	}
 }
@@ -256,3 +273,29 @@ func writeLatencies(rps float64, latencyOutputFile string) {
 	datawriter.Flush()
 	file.Close()
 }
+
+func writeFunctionDurations(funcDurationOutputFile string) {
+	profSlice.Lock()
+	defer profSlice.Unlock()
+
+	fileName := funcDurationOutputFile
+	log.Info("The measured function durations are saved in ", fileName)
+
+	file, err := os.OpenFile(fileName, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
+
+	if err != nil {
+		log.Fatal("Failed creating file: ", err)
+	}
+
+	datawriter := bufio.NewWriter(file)
+
+	for _, dur := range profSlice.slice {
+		_, err := datawriter.WriteString(strconv.FormatInt(dur, 10) + "\n")
+		if err != nil {
+			log.Fatal("Failed to write the URLs to a file ", err)
+		}
+	}
+
+	datawriter.Flush()
+	file.Close()
+}
\ No newline at end of file
diff --git a/tools/relay/server.go b/tools/relay/server.go
index 9e7f331a..05404d55 100644
--- a/tools/relay/server.go
+++ b/tools/relay/server.go
@@ -28,6 +28,8 @@ import (
 	"fmt"
 	"net"
 	"os"
+	"strconv"
+	"time"
 
 	pb "github.com/vhive-serverless/vSwarm-proto/proto/helloworld"
 
@@ -61,6 +63,7 @@ var (
 	value           = flag.String("value", "helloWorld", "String input to pass to benchmark")
 	functionMethod  = flag.String("function-method", "default", "Which method of benchmark to invoke")
 	verbose         = flag.Bool("verbose", false, "Enable verbose log printing")
+	profileFunction = flag.Bool("profile-function", false, "Enable function profiling")
 
 	// Client
 	grpcClient     grpcClients.GrpcClient
@@ -155,8 +158,22 @@ func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloRe
 	// Create new packet
 	pkt := inputGenerator.Next()
 	log.Debugf("Send to func: %s\n", pkt)
+
+	startTime := time.Now()
 	reply, err := grpcClient.Request(ctx, pkt)
-	log.Debugf("Recv from func: %s\n", reply)
+	endTime := time.Now()
+	elapsedTime := int64(endTime.Sub(startTime).Microseconds())
+
+	var finalReply string
+
+	if *profileFunction {
+		log.Debugf("Invoked in %d usec\n. Recv from func: %s\n", elapsedTime, reply)
+		elapsedTimeStr := strconv.FormatInt(elapsedTime, 10)
+		finalReply = reply + "|" + elapsedTimeStr
+	} else {
+		log.Debugf("Recv from func: %s\n", reply)
+		finalReply = reply
+	}
 
-	return &pb.HelloReply{Message: reply}, err
+	return &pb.HelloReply{Message: finalReply}, err
 }