tmux 2.x performance regression when switching windows

tmux 2.x performance regression when switching windows

[Patrick Mézard]

Hello,

I noticed moving between tmux windows became much slower since 2.0.x when running some applications in the windows. The problems disappear if I move back to 1.9. To reproduce:
- Cygwin: CYGWIN_NT-6.1-WOW PMD 2.0.2(0.287/5/3) 2015-05-08 17:03 i686 Cygwin, Win7 64 bits.
- Start tmux and create two windows.
- In one of the windows, execute the following Go program (natively compiled, Go 1.4.2 64-bits):
"""
package main

import (
    "fmt"
    "time"
)

func main() {
    for i := 0; ; i++ {
        fmt.Println(i)
        time.Sleep(500*time.Millisecond)
    }
}
"""
- Try switching between windows
KO => it eventually succeeds but lags a lot. With 1.9, the switch is immediate.

--
Patrick Mézard


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Re: tmux 2.x performance regression when switching windows

[Corinna Vinschen]

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On May 24 14:02, Patrick Mézard wrote:
> Hello,
> 
> I noticed moving between tmux windows became much slower since 2.0.x
> when running some applications in the windows. The problems disappear
> if I move back to 1.9. To reproduce:
> - Cygwin: CYGWIN_NT-6.1-WOW PMD 2.0.2(0.287/5/3) 2015-05-08 17:03 i686 Cygwin, Win7 64 bits.
> - Start tmux and create two windows.
> - In one of the windows, execute the following Go program (natively compiled, Go 1.4.2 64-bits):
> """
> package main
> 
> import (
>     "fmt"
>     "time"
> )
> 
> func main() {
>     for i := 0; ; i++ {
>         fmt.Println(i)
>         time.Sleep(500*time.Millisecond)
>     }
> }
> """
> - Try switching between windows
> KO => it eventually succeeds but lags a lot. With 1.9, the switch is
> immediate.

1.9?  Do you mean 1.7.35, by any chance?  This *may* be related to the
changes in the pty code, which now uses two different pipes for Cygwin
and for native processes...

Takashi, any chance you could take a look?


Thanks,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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Re: tmux 2.x performance regression when switching windows

[Takashi Yano]

Hi Corinna,

On Wed, 27 May 2015 14:43:43 +0200
Corinna Vinschen wrote:

> 1.9?  Do you mean 1.7.35, by any chance?  This *may* be related to the
> changes in the pty code, which now uses two different pipes for Cygwin
> and for native processes...

I guess he means tmux v1.9.

> Takashi, any chance you could take a look?

I have looked into this problem a bit.

This problem occurs with tmux v2.0, but does not occur with v1.9.
This is regardless of cygwin version (1.7.35 or 2.0.2).

The changes in the pty code seems to have no relation.

I think this is the same problem as:
http://cygwin.com/ml/cygwin/2015-05/msg00331.html

Help of the maintainer of tmux is necessary.

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>

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Re: tmux 2.x performance regression when switching windows

[Corinna Vinschen]

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Michael?  Ping?


On May 28 19:54, Takashi Yano wrote:
> Hi Corinna,
> 
> On Wed, 27 May 2015 14:43:43 +0200
> Corinna Vinschen wrote:
> 
> > 1.9?  Do you mean 1.7.35, by any chance?  This *may* be related to the
> > changes in the pty code, which now uses two different pipes for Cygwin
> > and for native processes...
> 
> I guess he means tmux v1.9.
> 
> > Takashi, any chance you could take a look?
> 
> I have looked into this problem a bit.
> 
> This problem occurs with tmux v2.0, but does not occur with v1.9.
> This is regardless of cygwin version (1.7.35 or 2.0.2).
> 
> The changes in the pty code seems to have no relation.
> 
> I think this is the same problem as:
> http://cygwin.com/ml/cygwin/2015-05/msg00331.html
> 
> Help of the maintainer of tmux is necessary.
> 
> -- 
> Takashi Yano <takashi.yano@nifty.ne.jp>
> 
> --
> Problem reports:       http://cygwin.com/problems.html
> FAQ:                   http://cygwin.com/faq/
> Documentation:         http://cygwin.com/docs.html
> Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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Re: tmux 2.x performance regression when switching windows

[Corinna Vinschen]

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On May 28 13:48, Corinna Vinschen wrote:
> Michael?  Ping?
> 
> 
> On May 28 19:54, Takashi Yano wrote:
> > Hi Corinna,
> > 
> > On Wed, 27 May 2015 14:43:43 +0200
> > Corinna Vinschen wrote:
> > 
> > > 1.9?  Do you mean 1.7.35, by any chance?  This *may* be related to the
> > > changes in the pty code, which now uses two different pipes for Cygwin
> > > and for native processes...
> > 
> > I guess he means tmux v1.9.
> > 
> > > Takashi, any chance you could take a look?
> > 
> > I have looked into this problem a bit.
> > 
> > This problem occurs with tmux v2.0, but does not occur with v1.9.
> > This is regardless of cygwin version (1.7.35 or 2.0.2).
> > 
> > The changes in the pty code seems to have no relation.
> > 
> > I think this is the same problem as:
> > http://cygwin.com/ml/cygwin/2015-05/msg00331.html

I uploaded a developer snapshot to https://cygwin.com/snapshots/ which
is supposed to fix this problem.  Please give it a try.


Thanks,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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