Re: Any idea about what makes Emacs slow reading on pipes?

[Jan D.]

> The following exhibits abysmal speed within Emacs:
>
> (let (process-connection-type) (switch-to-buffer (generate-new-buffer
> "*test*"))(erase-buffer)(start-process "test" (current-buffer) "sh"
> "-c" "hexdump -v /dev/zero|dd bs=1 count=100k")(erase-buffer))

...

> The system I see this in is
> GNU Emacs 21.3.50.3 (i686-pc-linux-gnu)
> a RedHat 9 system, but I have seen this in practically every Linux
> system up to now.  Is this a Linux-specific problem, or do others see
> this as well?

I could not reproduce this on a slackware (version unknown, but libc 6)
or a Mandrake 9.0 system.  Maybe running under strace can give some
indication of the system call that takes time (if that is the issue)?

        Jan D.