I must have missed this but just clarify my thoughts are all file reads
async now? That would a pretty big deal for apps that read a lot of files.
tors 15 juni 2017 kl 19:30 skrev Ian Lance Taylor <i...@golang.org>:
> On Thu, Jun 15, 2017 at 7:37 AM, <pmor...@gmail.com> wrote:
> >
> > With go1.9beta1 (Linux / amd64) I noticed an extra file descriptor that I
> > cannot explain.
> > A simple example is after calling ioutil.ReadDir().
> >
> > package main
> > import (
> >
> > "fmt"
> >
> > "io/ioutil"
> >
> > )
> >
> > func main() {
> >
> > _, err := ioutil.ReadDir(".")
> >
> > if err != nil {
> >
> > panic(err)
> >
> > }
> >
> > fmt.Scanln()
> >
> > }
> >
> >
> > sudo lsof -p `pidof fd-go1.9beta1`
> > COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
> > fd-go1.9b 3698 peter cwd DIR 8,2 4096 23596911
> > /home/peter/go/src/fd
> > fd-go1.9b 3698 peter rtd DIR 8,2 4096 2 /
> > fd-go1.9b 3698 peter txt REG 8,2 1964089 23596832
> > /home/peter/go/src/fd/fd-go1.9beta1
> > fd-go1.9b 3698 peter 0u CHR 136,1 0t0 4 /dev/pts/1
> > fd-go1.9b 3698 peter 1u CHR 136,1 0t0 4 /dev/pts/1
> > fd-go1.9b 3698 peter 2u CHR 136,1 0t0 4 /dev/pts/1
> > fd-go1.9b 3698 peter 4u a_inode 0,12 0 9667 [eventpoll]
> >
> > FD #4 doesn't show up with go1.8.3. Is this expected, a bug or something
> > else?
>
> In 1.9 the os package now uses the event poller that the net package
> has always used.
>
> I sent https://golang.org/cl/45910 to add that to the release notes.
>
> Ian
>
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