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

[David Kastrup]

Kevin Rodgers <address@hidden> writes:

> David Kastrup wrote:
> 
> > 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))
> > More to the point, things start out dead slow and get faster later.
> > It is not the fault of the programs on the sending side: just piping
> > into cat >/dev/null instead of Emacs is much much faster.  It does
> > not seem that setting process-connection-type to nil as above (using
> > a pipe instead of a pty) does help worth noting.
> > 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?
> 
> /usr/bin/sh: hexdump: not found
> 
> Can you suggest an alternative to hexdump for Solaris?

Probably od -h -v or something.  The point was just fast producing
large amounts of more or less reproducable text.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum