nanomsg.org/go/mangos/v2@v2.0.9-0.20200203084354-8a092611e461/perf/reqlatency.go (about)

     1  // Copyright 2019 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 perf provides utilities to measure mangos peformance against
    16  // libnanomsg' perf tools.
    17  
    18  package main
    19  
    20  import (
    21  	"fmt"
    22  	"log"
    23  	"time"
    24  
    25  	"nanomsg.org/go/mangos/v2"
    26  	"nanomsg.org/go/mangos/v2/protocol/rep"
    27  	"nanomsg.org/go/mangos/v2/protocol/req"
    28  	"nanomsg.org/go/mangos/v2/transport/all"
    29  )
    30  
    31  // ReqRepLatencyServer is the server side for REQ/REP latency testing.
    32  func ReqRepLatencyServer(addr string, msgSize int, roundTrips int) {
    33  	s, err := rep.NewSocket()
    34  	if err != nil {
    35  		log.Fatalf("Failed to make new pair socket: %v", err)
    36  	}
    37  	defer func() { time.Sleep(10 * time.Microsecond); _ = s.Close() }()
    38  
    39  	all.AddTransports(s)
    40  	l, err := s.NewListener(addr, nil)
    41  	if err != nil {
    42  		log.Fatalf("Failed to make new listener: %v", err)
    43  	}
    44  
    45  	err = l.Listen()
    46  	if err != nil {
    47  		log.Fatalf("Failed to listen: %v", err)
    48  	}
    49  	for i := 0; i != roundTrips; i++ {
    50  		msg, err := s.RecvMsg()
    51  		if err != nil {
    52  			log.Fatalf("Failed to recv: %v", err)
    53  		}
    54  		if len(msg.Body) != msgSize {
    55  			log.Fatalf("Received wrong message size: %d != %d", len(msg.Body), msgSize)
    56  		}
    57  		if err = s.SendMsg(msg); err != nil {
    58  			log.Fatalf("Failed to send: %v", err)
    59  		}
    60  	}
    61  }
    62  
    63  // ReqRepLatencyClient is the client side of the latency test.  It measures
    64  // round trip times using REQ/REP protocol.
    65  func ReqRepLatencyClient(addr string, msgSize int, roundTrips int) {
    66  	s, err := req.NewSocket()
    67  	if err != nil {
    68  		log.Fatalf("Failed to make new pair socket: %v", err)
    69  	}
    70  	defer func() {
    71  		_ = s.Close()
    72  	}()
    73  
    74  	all.AddTransports(s)
    75  	d, err := s.NewDialer(addr, nil)
    76  	if err != nil {
    77  		log.Fatalf("Failed to make new dialer: %v", err)
    78  	}
    79  
    80  	err = d.Dial()
    81  	if err != nil {
    82  		log.Fatalf("Failed to dial: %v", err)
    83  	}
    84  
    85  	// 100 milliseconds to give TCP a chance to establish
    86  	time.Sleep(time.Millisecond * 100)
    87  	msg := mangos.NewMessage(msgSize)
    88  
    89  	total := time.Duration(0)
    90  	for i := 0; i < roundTrips; i++ {
    91  		msg.Body = msg.Body[0:msgSize]
    92  		msg.Header = msg.Header[:0]
    93  		start := time.Now()
    94  		if err = s.SendMsg(msg); err != nil {
    95  			log.Fatalf("Failed SendMsg: %v", err)
    96  		}
    97  		if msg, err = s.RecvMsg(); err != nil {
    98  			log.Fatalf("Failed RecvMsg: %v", err)
    99  		}
   100  		total += time.Since(start)
   101  	}
   102  	msg.Free()
   103  
   104  	lat := float64(total/time.Microsecond) / float64(roundTrips)
   105  	fmt.Printf("message size: %d [B]\n", msgSize)
   106  	fmt.Printf("round trip count: %d\n", roundTrips)
   107  	fmt.Printf("average RTT: %.3f [us]\n", lat)
   108  }