From mboxrd@z Thu Jan 1 00:00:00 1970 Path: main.gmane.org!not-for-mail From: kai.grossjohann@gmx.net (=?iso-8859-1?q?Kai_Gro=DFjohann?=) Newsgroups: gmane.emacs.devel Subject: Re: Any idea about what makes Emacs slow reading on pipes? Date: Sun, 18 May 2003 17:09:57 +0200 Organization: University of Duisburg, Germany Sender: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Message-ID: <84smrc47ga.fsf@lucy.is.informatik.uni-duisburg.de> References: <5x1xyye3y4.fsf@kfs2.cua.dk> <5xznllw0wp.fsf@kfs2.cua.dk> <84of20skuq.fsf@lucy.is.informatik.uni-duisburg.de> NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: main.gmane.org 1053271067 9375 80.91.224.249 (18 May 2003 15:17:47 GMT) X-Complaints-To: usenet@main.gmane.org NNTP-Posting-Date: Sun, 18 May 2003 15:17:47 +0000 (UTC) Original-X-From: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Sun May 18 17:17:45 2003 Return-path: Original-Received: from quimby.gnus.org ([80.91.224.244]) by main.gmane.org with esmtp (Exim 3.35 #1 (Debian)) id 19HPuz-0002R2-00 for ; Sun, 18 May 2003 17:17:45 +0200 Original-Received: from monty-python.gnu.org ([199.232.76.173]) by quimby.gnus.org with esmtp (Exim 3.12 #1 (Debian)) id 19HQ4M-0000ry-00 for ; Sun, 18 May 2003 17:27:26 +0200 Original-Received: from localhost ([127.0.0.1] helo=monty-python.gnu.org) by monty-python.gnu.org with esmtp (Exim 4.10.13) id 19HPsr-0005qQ-03 for emacs-devel@quimby.gnus.org; Sun, 18 May 2003 11:15:33 -0400 Original-Received: from list by monty-python.gnu.org with tmda-scanned (Exim 4.10.13) id 19HPrQ-0004u7-00 for emacs-devel@gnu.org; Sun, 18 May 2003 11:14:04 -0400 Original-Received: from mail by monty-python.gnu.org with spam-scanned (Exim 4.10.13) id 19HPoU-0002Mj-00 for emacs-devel@gnu.org; Sun, 18 May 2003 11:11:03 -0400 Original-Received: from main.gmane.org ([80.91.224.249]) by monty-python.gnu.org with esmtp (Exim 4.10.13) id 19HPnb-00026X-00 for emacs-devel@gnu.org; Sun, 18 May 2003 11:10:08 -0400 Original-Received: from list by main.gmane.org with local (Exim 3.35 #1 (Debian)) id 19HPlr-0001wa-00 for ; Sun, 18 May 2003 17:08:19 +0200 Mail-Followup-To: emacs-devel@gnu.org X-Injected-Via-Gmane: http://gmane.org/ Original-To: emacs-devel@gnu.org Original-Received: from news by main.gmane.org with local (Exim 3.35 #1 (Debian)) id 19HPlq-0001wH-00 for ; Sun, 18 May 2003 17:08:18 +0200 Original-Lines: 24 Original-X-Complaints-To: usenet@main.gmane.org Mail-Copies-To: never User-Agent: Gnus/5.1003 (Gnus v5.10.3) Emacs/21.3.50 (gnu/linux) Cancel-Lock: sha1:JBYQLCF7LxRI6SJLzUFVzVDcLUQ= X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1b5 Precedence: list List-Id: Emacs development discussions. List-Help: List-Post: List-Subscribe: , List-Archive: List-Unsubscribe: , Errors-To: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Xref: main.gmane.org gmane.emacs.devel:13970 X-Report-Spam: http://spam.gmane.org/gmane.emacs.devel:13970 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.