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

[Kevin Rodgers <ihs_4664@yahoo.com>]

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?

-- 
<a href="mailto:&lt;kevin.rodgers&#64;ihs.com&gt;">Kevin Rodgers</a>