github.com/gdamore/mangos@v1.4.0/perf/latency.go (about)

     1  // Copyright 2018 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"
    26  	"nanomsg.org/go-mangos/protocol/pair"
    27  	"nanomsg.org/go-mangos/transport/all"
    28  )
    29  
    30  // LatencyServer is the server side -- very much equivalent to local_lat in
    31  // nanomsg/perf.  It does no measurement at all, just sends packets on the wire.
    32  func LatencyServer(addr string, msgSize int, roundTrips int) {
    33  	s, err := pair.NewSocket()
    34  	if err != nil {
    35  		log.Fatalf("Failed to make new pair socket: %v", err)
    36  	}
    37  	defer 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  	// TCP no delay, please!
    46  	l.SetOption(mangos.OptionNoDelay, true)
    47  
    48  	// Make sure we linger a bit on close...
    49  	err = s.SetOption(mangos.OptionLinger, time.Second)
    50  	if err != nil {
    51  		log.Fatalf("Failed set Linger: %v", err)
    52  	}
    53  
    54  	err = l.Listen()
    55  	if err != nil {
    56  		log.Fatalf("Failed to listen: %v", err)
    57  	}
    58  	for i := 0; i != roundTrips; i++ {
    59  		msg, err := s.RecvMsg()
    60  		if err != nil {
    61  			log.Fatalf("Failed to recv: %v", err)
    62  		}
    63  		if len(msg.Body) != msgSize {
    64  			log.Fatalf("Received wrong message size: %d != %d", len(msg.Body), msgSize)
    65  		}
    66  		if err = s.SendMsg(msg); err != nil {
    67  			log.Fatalf("Failed to send: %v", err)
    68  		}
    69  	}
    70  }
    71  
    72  // LatencyClient is the client side of the latency test.  It measures round
    73  // trip times, and is the equivalent to nanomsg/perf/remote_lat.
    74  func LatencyClient(addr string, msgSize int, roundTrips int) {
    75  	s, err := pair.NewSocket()
    76  	if err != nil {
    77  		log.Fatalf("Failed to make new pair socket: %v", err)
    78  	}
    79  	defer s.Close()
    80  
    81  	all.AddTransports(s)
    82  	d, err := s.NewDialer(addr, nil)
    83  	if err != nil {
    84  		log.Fatalf("Failed to make new dialer: %v", err)
    85  	}
    86  
    87  	// TCP no delay, please!
    88  	d.SetOption(mangos.OptionNoDelay, true)
    89  
    90  	// Make sure we linger a bit on close...
    91  	err = s.SetOption(mangos.OptionLinger, time.Second)
    92  	if err != nil {
    93  		log.Fatalf("Failed set Linger: %v", err)
    94  	}
    95  
    96  	err = d.Dial()
    97  	if err != nil {
    98  		log.Fatalf("Failed to dial: %v", err)
    99  	}
   100  
   101  	// 100 milliseconds to give TCP a chance to establish
   102  	//time.Sleep(time.Millisecond * 100)
   103  	msg := mangos.NewMessage(msgSize)
   104  	msg.Body = msg.Body[0:msgSize]
   105  
   106  	start := time.Now()
   107  	for i := 0; i < roundTrips; i++ {
   108  		if err = s.SendMsg(msg); err != nil {
   109  			log.Fatalf("Failed SendMsg: %v", err)
   110  		}
   111  		if msg, err = s.RecvMsg(); err != nil {
   112  			log.Fatalf("Failed RecvMsg: %v", err)
   113  		}
   114  	}
   115  	finish := time.Now()
   116  	msg.Free()
   117  
   118  	total := (finish.Sub(start)) / time.Microsecond
   119  	lat := float64(total) / float64(roundTrips*2)
   120  	fmt.Printf("message size: %d [B]\n", msgSize)
   121  	fmt.Printf("round trip count: %d\n", roundTrips)
   122  	fmt.Printf("average latency: %.3f [us]\n", lat)
   123  }