go.nanomsg.org/mangos/v3@v3.4.3-0.20240217232803-46464076f1f5/perf/latency.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/pair"
    24  	"go.nanomsg.org/mangos/v3/transport/all"
    25  )
    26  
    27  // LatencyServer is the server side -- very much equivalent to local_lat in
    28  // nanomsg/perf.  It does no measurement at all, just sends packets on the wire.
    29  func LatencyServer(addr string, msgSize int, roundTrips int) {
    30  	s, err := pair.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  // LatencyClient is the client side of the latency test.  It measures round
    61  // trip times, and is the equivalent to nanomsg/perf/remote_lat.
    62  func LatencyClient(addr string, msgSize int, roundTrips int) {
    63  	s, err := pair.NewSocket()
    64  	if err != nil {
    65  		log.Fatalf("Failed to make new pair socket: %v", err)
    66  	}
    67  	defer func() { _ = s.Close() }()
    68  
    69  	all.AddTransports(s)
    70  	d, err := s.NewDialer(addr, nil)
    71  	if err != nil {
    72  		log.Fatalf("Failed to make new dialer: %v", err)
    73  	}
    74  
    75  	if err = d.Dial(); err != nil {
    76  		log.Fatalf("Failed to dial: %v", err)
    77  	}
    78  
    79  	// 100 milliseconds to give TCP a chance to establish
    80  	// time.Sleep(time.Millisecond * 100)
    81  	msg := mangos.NewMessage(msgSize)
    82  	msg.Body = msg.Body[0:msgSize]
    83  
    84  	start := time.Now()
    85  	for i := 0; i < roundTrips; i++ {
    86  		if err = s.SendMsg(msg); err != nil {
    87  			log.Fatalf("Failed SendMsg: %v", err)
    88  		}
    89  		if msg, err = s.RecvMsg(); err != nil {
    90  			log.Fatalf("Failed RecvMsg: %v", err)
    91  		}
    92  	}
    93  	finish := time.Now()
    94  	msg.Free()
    95  
    96  	total := (finish.Sub(start)) / time.Microsecond
    97  	lat := float64(total) / float64(roundTrips*2)
    98  	fmt.Printf("message size: %d [B]\n", msgSize)
    99  	fmt.Printf("round trip count: %d\n", roundTrips)
   100  	fmt.Printf("average latency: %.3f [us]\n", lat)
   101  }