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// Copyright (c) 2017 Cisco and/or its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Binary simple-client is an example VPP management application that exercises the
// govpp API on real-world use-cases.
package main
import (
"flag"
"fmt"
"log"
"os"
"sync"
"time"
"github.com/pkg/profile"
"github.com/sirupsen/logrus"
"git.fd.io/govpp.git"
"git.fd.io/govpp.git/api"
"git.fd.io/govpp.git/core"
"git.fd.io/govpp.git/core/bin_api/vpe"
)
const (
defaultSyncRequestCount = 1000
defaultAsyncRequestCount = 1000000
)
func main() {
// parse optional flags
var sync, prof bool
var cnt int
flag.BoolVar(&sync, "sync", false, "run synchronous perf test")
flag.IntVar(&cnt, "cnt", 0, "count of requests to be sent to VPP")
flag.BoolVar(&prof, "prof", false, "generate profile data")
flag.Parse()
if cnt == 0 {
// no specific count defined - use defaults
if sync {
cnt = defaultSyncRequestCount
} else {
cnt = defaultAsyncRequestCount
}
}
if prof {
defer profile.Start().Stop()
}
// log only errors
core.SetLogger(&logrus.Logger{Level: logrus.ErrorLevel})
// connect to VPP
conn, err := govpp.Connect("")
if err != nil {
log.Println("Error:", err)
os.Exit(1)
}
defer conn.Disconnect()
// create an API channel
ch, err := conn.NewAPIChannelBuffered(cnt, cnt)
if err != nil {
log.Println("Error:", err)
os.Exit(1)
}
defer ch.Close()
// run the test & measure the time
start := time.Now()
if sync {
// run synchronous test
syncTest(ch, cnt)
} else {
// run asynchronous test
asyncTest(ch, cnt)
}
elapsed := time.Since(start)
fmt.Println("Test took:", elapsed)
fmt.Printf("Requests per second: %.0f\n", float64(cnt)/elapsed.Seconds())
}
func syncTest(ch api.Channel, cnt int) {
fmt.Printf("Running synchronous perf test with %d requests...\n", cnt)
for i := 0; i < cnt; i++ {
req := &vpe.ControlPing{}
reply := &vpe.ControlPingReply{}
err := ch.SendRequest(req).ReceiveReply(reply)
if err != nil {
log.Println("Error in reply:", err)
os.Exit(1)
}
}
}
func asyncTest(ch api.Channel, cnt int) {
fmt.Printf("Running asynchronous perf test with %d requests...\n", cnt)
// start a new go routine that reads the replies
var wg sync.WaitGroup
wg.Add(1)
go readAsyncReplies(ch, cnt, &wg)
// send asynchronous requests
sendAsyncRequests(ch, cnt)
// wait until all replies are recieved
wg.Wait()
}
func sendAsyncRequests(ch api.Channel, cnt int) {
for i := 0; i < cnt; i++ {
ch.GetRequestChannel() <- &api.VppRequest{
Message: &vpe.ControlPing{},
}
}
}
func readAsyncReplies(ch api.Channel, expectedCnt int, wg *sync.WaitGroup) {
cnt := 0
for {
// receive a reply
reply := <-ch.GetReplyChannel()
if reply.Error != nil {
log.Println("Error in reply:", reply.Error)
os.Exit(1)
}
// decode the message
msg := &vpe.ControlPingReply{}
err := ch.GetMessageDecoder().DecodeMsg(reply.Data, msg)
if reply.Error != nil {
log.Println("Error by decoding:", err)
os.Exit(1)
}
// count and return if done
cnt++
if cnt >= expectedCnt {
wg.Done()
return
}
}
}
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