Created
June 29, 2019 11:07
dnsbench
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package main | |
import ( | |
"context" | |
"flag" | |
"fmt" | |
"net" | |
"time" | |
) | |
var ( | |
concurrency = flag.Int("c", 100, "concurrency requests") | |
totalReq = flag.Int("n", 10000, "total requests") | |
slowSec = flag.Float64("s", 5, "response larger than this value, considered as slow") | |
host = flag.String("d", "google.com", "host to query") | |
) | |
func main() { | |
flag.Parse() | |
slowCount := 0 | |
sem := make(chan bool, *concurrency) | |
for i := 0; i < *totalReq; i++ { | |
sem <- true | |
go func() { | |
defer func() { <-sem }() | |
resolver := &net.Resolver{} | |
t := time.Now() | |
_, err := resolver.LookupIPAddr(context.Background(), *host) | |
if err != err { | |
fmt.Println(err) | |
} | |
cost := time.Since(t).Seconds() | |
if cost >= *slowSec { | |
slowCount += 1 | |
fmt.Println("slow resp:", cost) | |
} | |
}() | |
} | |
for i := 0; i < cap(sem); i++ { | |
sem <- true | |
} | |
fmt.Println("slowCount:", slowCount) | |
} |
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