Can't copy large file from some remote machines.

[failable]

When trying to copy a large remote file to my local directory, dired-async-do-copy creates a new buffer call *emacs* with content Lisp expression: File log.txt is large (336.9M), really copy? (y or n). I'm not able to answer y in this buffer and a character y is inserted in to this buffer. The process of this buffer is waiting for reply until I kill it.

But this did not happen to every remote machine I tested with the same large file size. Some will never prompt for confirmation and copy started automatically. I've tried to set dired-no-confirm, but no magic happened.

Small files are always ok.

Local emacs version: GNU Emacs 26.2 (build 1, x86_64-apple-darwin18.5.0, Carbon Version 158 AppKit 1671.4) of 2019-04-15

Thanks.

[thierryvolpiatto]

isolet notifications@github.com writes:

When trying to copy a large remote file to my local directory, dired-async-do-copy creates a new buffer call emacs with content Lisp expression: File log.txt is large (336.9M), really copy? (y or n) . I'm not able to answer y in this buffer and a character y is inserted in to this buffer. The process of this buffer is waiting for reply until I kill it.

But this did not happen to every remote machine I tested with the same large file size. Some will never prompt for confirmation and copy started automatically.

Small files are always ok.

Which method are you using to copy?

-- Thierry

[failable]

May I ask what do you mean by 'method'? I setup dired-async, use tramp to open a remote dired buffer and press C on the specific file to copy.

[thierryvolpiatto]

isolet notifications@github.com writes:

May I ask what do you mean by 'method'?

ssh? scp?

I setup dired-async, use tramp to open a remote dired buffer and press C on the specific file to copy.

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-- Thierry

[failable]

ssh.

[thierryvolpiatto]

isolet notifications@github.com writes:

ssh.

Ah! Try with scp on large files, however you will hit this bug when trying to copy many files (marked) at once: https://github.com/emacs-helm/helm/issues/1945

-- Thierry

[failable]

Thanks.

[darkfeline]

I started experiencing this, why does this happen?

[thierryvolpiatto]

darkfeline @.***> writes:

I started experiencing this, why does this happen?

More infos?

Nothing have changed here since a while, so I guess you maybe have a tramp bug.

Be sure to use scp method, ssh is unable to copy large files (may even crash your system as it will quickly goes out of memory).

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-- Thierry

[darkfeline]

Why do you say it's a tramp bug? If we know it's a tramp bug, is there an upstream report?

I am just trying to understand it since it feels mysterious to me.

The bug you linked in https://github.com/jwiegley/emacs-async/issues/111#issuecomment-485225536 says that scp doesn't work, use ssh instead, and now you say ssh doesn't work, use scp instead?

[thierryvolpiatto]

darkfeline @.***> writes:

Why do you say it's a tramp bug? If we know it's a tramp bug, is there an upstream report?

M-x report-emacs-bug

I am just trying to understand it since it feels mysterious to me.

The bug you linked in #111 (comment) says that scp doesn't work, use ssh instead,

No scp fails to copy more than 3 marked files IIRC (see helm bug 1945), but works fine for a single large file whereas ssh fails when files are too big.

and now you say ssh doesn't work, use scp instead?

No please read carefully.

-- Thierry