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

From: Andreas Schwab
Subject: Re: Any idea about what makes Emacs slow reading on pipes?
Date: Fri, 16 May 2003 15:55:33 +0200
User-agent: Gnus/5.1001 (Gnus v5.10.1) Emacs/21.3.50 (gnu/linux)

address@hidden (David Kastrup) writes:

|> 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 (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 cannot reproduce that on ppc-suse-linux.  I also tried out MacOS X on
the same machine, and there the overall speed is much lower, but still
mostly constant.


Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux AG, Deutschherrnstr. 15-19, D-90429 N├╝rnberg
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