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bug#49714: 28.0.50; TRAMP burns CPU and has insufficient user reporting
From: |
Michael Albinus |
Subject: |
bug#49714: 28.0.50; TRAMP burns CPU and has insufficient user reporting when using xxxx-sk SSH keys |
Date: |
Sat, 24 Jul 2021 20:30:07 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Dima Kogan <dima@secretsauce.net> writes:
Hi Dima,
>>> 1. Emacs should not be spinning the CPU. This is actually an old bug. I
>>> usually see this with normal SSH connections, but it only happens
>>> during the login sequence, which isn't very long. In THIS case the
>>> login sequence could be longer. In any case, we shouldn't be
>>> spinning.
>>
>> Not so simple. Tramp is in a loop, reading the process output, and
>> checking, whether there is something it has to handle (for example,
>> password requests). This loop runs until Tramp detects the remote shell
>> prompt.
>
> There should be a loop, but emacs shouldn't be using all my CPU cycles
> while waiting for user interaction. Emacs can select() on the ssh
> process file descriptor, and sleep until the ssh process has stuff to
> say.
Well, I'm on Lisp level. I just have accept-process-output, and in my
loop I check whether there is new output. There's no low level API to
let Emacs sleep for the ssh process file descriptor.
- bug#49714: 28.0.50; TRAMP burns CPU and has insufficient user reporting when using xxxx-sk SSH keys, (continued)
- bug#49714: 28.0.50; TRAMP burns CPU and has insufficient user reporting when using xxxx-sk SSH keys, Dima Kogan, 2021/07/24
- bug#49714: 28.0.50; TRAMP burns CPU and has insufficient user reporting when using xxxx-sk SSH keys, Michael Albinus, 2021/07/24
- bug#49714: 28.0.50; TRAMP burns CPU and has insufficient user reporting when using xxxx-sk SSH keys, Dima Kogan, 2021/07/24
- bug#49714: 28.0.50; TRAMP burns CPU and has insufficient user reporting when using xxxx-sk SSH keys, Michael Albinus, 2021/07/24
- bug#49714: 28.0.50; TRAMP burns CPU and has insufficient user reporting when using xxxx-sk SSH keys, Dima Kogan, 2021/07/24
- bug#49714: 28.0.50; TRAMP burns CPU and has insufficient user reporting when using xxxx-sk SSH keys, Michael Albinus, 2021/07/25
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- bug#49714: 28.0.50; TRAMP burns CPU and has insufficient user reporting when using xxxx-sk SSH keys, Michael Albinus, 2021/07/28
- bug#49714: 28.0.50; TRAMP burns CPU and has insufficient user reporting when using xxxx-sk SSH keys, Dima Kogan, 2021/07/28
- bug#49714: 28.0.50; TRAMP burns CPU and has insufficient user reporting when using xxxx-sk SSH keys, Michael Albinus, 2021/07/28
- bug#49714: 28.0.50; TRAMP burns CPU and has insufficient user reporting when using xxxx-sk SSH keys, Dima Kogan, 2021/07/28
- bug#49714: 28.0.50; TRAMP burns CPU and has insufficient user reporting when using xxxx-sk SSH keys,
Michael Albinus <=