go.nanomsg.org/mangos/v3@v3.4.3-0.20240217232803-46464076f1f5/perf/reqlatency.go (about)

     1  // Copyright 2020 The Mangos Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use file except in compliance with the License.
     5  // You may obtain a copy of the license at
     6  //
     7  //    http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package main
    16  
    17  import (
    18  	"fmt"
    19  	"log"
    20  	"time"
    21  
    22  	"go.nanomsg.org/mangos/v3"
    23  	"go.nanomsg.org/mangos/v3/protocol/rep"
    24  	"go.nanomsg.org/mangos/v3/protocol/req"
    25  	"go.nanomsg.org/mangos/v3/transport/all"
    26  )
    27  
    28  // ReqRepLatencyServer is the server side for REQ/REP latency testing.
    29  func ReqRepLatencyServer(addr string, msgSize int, roundTrips int) {
    30  	s, err := rep.NewSocket()
    31  	if err != nil {
    32  		log.Fatalf("Failed to make new pair socket: %v", err)
    33  	}
    34  	defer func() { time.Sleep(10 * time.Microsecond); _ = s.Close() }()
    35  
    36  	all.AddTransports(s)
    37  	l, err := s.NewListener(addr, nil)
    38  	if err != nil {
    39  		log.Fatalf("Failed to make new listener: %v", err)
    40  	}
    41  
    42  	err = l.Listen()
    43  	if err != nil {
    44  		log.Fatalf("Failed to listen: %v", err)
    45  	}
    46  	for i := 0; i != roundTrips; i++ {
    47  		msg, err := s.RecvMsg()
    48  		if err != nil {
    49  			log.Fatalf("Failed to recv: %v", err)
    50  		}
    51  		if len(msg.Body) != msgSize {
    52  			log.Fatalf("Received wrong message size: %d != %d", len(msg.Body), msgSize)
    53  		}
    54  		if err = s.SendMsg(msg); err != nil {
    55  			log.Fatalf("Failed to send: %v", err)
    56  		}
    57  	}
    58  }
    59  
    60  // ReqRepLatencyClient is the client side of the latency test.  It measures
    61  // round trip times using REQ/REP protocol.
    62  func ReqRepLatencyClient(addr string, msgSize int, roundTrips int) {
    63  	s, err := req.NewSocket()
    64  	if err != nil {
    65  		log.Fatalf("Failed to make new pair socket: %v", err)
    66  	}
    67  	defer func() {
    68  		_ = s.Close()
    69  	}()
    70  
    71  	all.AddTransports(s)
    72  	d, err := s.NewDialer(addr, nil)
    73  	if err != nil {
    74  		log.Fatalf("Failed to make new dialer: %v", err)
    75  	}
    76  
    77  	err = d.Dial()
    78  	if err != nil {
    79  		log.Fatalf("Failed to dial: %v", err)
    80  	}
    81  
    82  	// 100 milliseconds to give TCP a chance to establish
    83  	time.Sleep(time.Millisecond * 100)
    84  	msg := mangos.NewMessage(msgSize)
    85  
    86  	total := time.Duration(0)
    87  	for i := 0; i < roundTrips; i++ {
    88  		msg.Body = msg.Body[0:msgSize]
    89  		msg.Header = msg.Header[:0]
    90  		start := time.Now()
    91  		if err = s.SendMsg(msg); err != nil {
    92  			log.Fatalf("Failed SendMsg: %v", err)
    93  		}
    94  		if msg, err = s.RecvMsg(); err != nil {
    95  			log.Fatalf("Failed RecvMsg: %v", err)
    96  		}
    97  		total += time.Since(start)
    98  	}
    99  	msg.Free()
   100  
   101  	lat := float64(total/time.Microsecond) / float64(roundTrips)
   102  	fmt.Printf("message size: %d [B]\n", msgSize)
   103  	fmt.Printf("round trip count: %d\n", roundTrips)
   104  	fmt.Printf("average RTT: %.3f [us]\n", lat)
   105  }