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Re: Any idea about what makes Emacs slow reading on pipes?
From: |
David Kastrup |
Subject: |
Re: Any idea about what makes Emacs slow reading on pipes? |
Date: |
18 May 2003 17:36:15 +0200 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.3.50 |
address@hidden (Kai Großjohann) writes:
> address@hidden (David Kastrup) writes:
>
> > It pretty obviously does. Here is a test: start an xterm. Then run
> >
> > od -v /dev/zero|dd obs=1
> >
> > in it. Then, in some other shell window, type
> >
> > while true;do :; done
>
> Interestingly enough, I can't observe this effect. At least, the
> output scrolls by really fast in both cases, and maybe I just can't
> see the difference between two really fast speeds...
Interestingly enough, I can't reliably reproduce this effect either.
Hilarious. Maybe it has something to do with what xterms I started as
background processes (different nicety?). Oh, if I have a block
cursor blinking in yet another window, this seems to help. Crazy.
> I'm running Linux 2.4.20 on a 2GHz Celeron. I think that means I
> don't have Hyperthreading and therefore just one CPU.
Perhaps your CPU is to fast.
> I've now looked again on another machine (2GHz Mobile Pentium 4, same
> kernel), and I can see the leading digits couting, and they count at
> the same speed regardless of the while loop.
Well, having just half the computing power available at least should
not leave you with the same speed, should it?
--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
- Re: Any idea about what makes Emacs slow reading on pipes?, (continued)
- Re: Any idea about what makes Emacs slow reading on pipes?, Stefan Monnier, 2003/05/17
- Re: Any idea about what makes Emacs slow reading on pipes?, Kai Großjohann, 2003/05/18
- Re: Any idea about what makes Emacs slow reading on pipes?, David Kastrup, 2003/05/18
- Re: Any idea about what makes Emacs slow reading on pipes?, Richard Stallman, 2003/05/18
- Re: Any idea about what makes Emacs slow reading on pipes?, David Kastrup, 2003/05/18
- Re: Any idea about what makes Emacs slow reading on pipes?, Kai Großjohann, 2003/05/19
- Re: Any idea about what makes Emacs slow reading on pipes?, David Kastrup, 2003/05/19
- Re: Any idea about what makes Emacs slow reading on pipes?, Kai Großjohann, 2003/05/18
- Re: Any idea about what makes Emacs slow reading on pipes?, David Kastrup, 2003/05/18
- Re: Any idea about what makes Emacs slow reading on pipes?, Kai Großjohann, 2003/05/18
- Re: Any idea about what makes Emacs slow reading on pipes?,
David Kastrup <=
- Re: Any idea about what makes Emacs slow reading on pipes?, Kai Großjohann, 2003/05/18
- Re: Any idea about what makes Emacs slow reading on pipes?, David Kastrup, 2003/05/18
- Re: Any idea about what makes Emacs slow reading on pipes?, Kai Großjohann, 2003/05/19
- Re: Any idea about what makes Emacs slow reading on pipes?, David Kastrup, 2003/05/19
- Re: Any idea about what makes Emacs slow reading on pipes?, Richard Stallman, 2003/05/18