I tried 1.16.
$ go version
go version go1.16 darwin/amd64
The problem still exists. When I change mymachine.local to
mymachine_local, the problem is gone. So somehow, this is related to
host resolution? It might try to DNS lookup the hostname, when it can
not find it via DNS then it look up in /etc/hosts?
On 2/22/21, Ian Lance Taylor <i...@golang.org> wrote:
> On Mon, Feb 22, 2021 at 12:22 PM Peng Yu <pengyu...@gmail.com> wrote:
>>
>> I run the following go program using net.Dial(). Depending on whether
>> I specify a local hostname (defined in /etc/hosts) or an IP. I get
>> very different runtimes.
>>
>> But `ping mymachine.local` resolves the hostname to an IP address
>> instantaneously. So the two calls of the go program should have the
>> same runtimes.
>>
>> Can anybody reproduce the same runtime problem? Does anybody know what
>> is wrong with the implementation of net.Dial()? Thanks.
>>
>> $ ./main mymachine.local:22
>> 2021/02/22 14:14:25 before
>> 2021/02/22 14:14:30 after
>> $ ./main 192.168.1.104:22
>> 2021/02/22 14:14:30 before
>> 2021/02/22 14:14:30 after
>> $ cat main.go
>> package main
>> import (
>> "net"
>> "log"
>> "os"
>> )
>>
>> func main() {
>> dialAddr := os.Args[1]
>> log.Println("before")
>> _, err := net.Dial("tcp", dialAddr)
>> log.Println("after")
>> if err != nil {
>> log.Fatalln(err)
>> }
>> }
>
> Which version of Go are you using? What operating system are you running
> on?
>
> It is possible that are running into https://golang.org/issue/35305,
> which is fixed in 1.16.
>
> Ian
>
--
Regards,
Peng
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