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From: kai.grossjohann@gmx.net (Kai Großjohann)
Subject: Re: Any idea about what makes Emacs slow reading on pipes?
Date: Sun, 18 May 2003 17:09:57 +0200	[thread overview]
Message-ID: <84smrc47ga.fsf@lucy.is.informatik.uni-duisburg.de> (raw)
In-Reply-To: x5addk4ln3.fsf@lola.goethe.zz

David.Kastrup@t-online.de (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...

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.

Hm.

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.
-- 
This line is not blank.

  reply	other threads:[~2003-05-18 15:09 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-05-16 13:08 Any idea about what makes Emacs slow reading on pipes? David Kastrup
2003-05-16 13:55 ` Andreas Schwab
2003-05-16 17:18 ` Kevin Rodgers
2003-05-16 17:34   ` David Kastrup
2003-05-16 18:38     ` Kevin Rodgers
2003-05-16 18:49       ` David Kastrup
2003-05-16 17:48 ` Jan D.
2003-05-16 18:38   ` David Kastrup
2003-05-16 20:23     ` Jan D.
2003-05-16 21:00     ` Andreas Schwab
2003-05-16 23:17     ` Satyaki Das
2003-05-17  1:50     ` Kim F. Storm
2003-05-17  0:34       ` David Kastrup
2003-05-18  0:31         ` Kim F. Storm
2003-05-17 23:07           ` Stefan Monnier
2003-05-17 23:39           ` David Kastrup
2003-05-18  2:09             ` Stefan Monnier
2003-05-18  8:45             ` Kai Großjohann
2003-05-18 10:12               ` David Kastrup
2003-05-18 19:04               ` Richard Stallman
2003-05-18 19:46                 ` David Kastrup
2003-05-19  7:33                   ` Kai Großjohann
2003-05-19  8:24                     ` David Kastrup
2003-05-18  8:46             ` Kai Großjohann
2003-05-18 10:03               ` David Kastrup
2003-05-18 15:09                 ` Kai Großjohann [this message]
2003-05-18 15:36                   ` David Kastrup
2003-05-18 15:50                     ` Kai Großjohann
2003-05-18 16:28                       ` David Kastrup
2003-05-19  7:26                         ` Kai Großjohann
2003-05-19  8:09                           ` David Kastrup
2003-05-18 19:03           ` Richard Stallman

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