From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 13 Nov 2000 10:16:23 -0500 (EST) From: "Benjamin C.R. LaHaise" Subject: Re: reliability of linux-vm subsystem (fwd) Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: linux-mm@kvack.org List-ID: Please be sure to attribute properly when replying to this =) >>From erik@arthur.ubicom.tudelft.nl Mon Nov 13 08:07:24 2000 Received: from mailhst2.its.tudelft.nl ([130.161.34.250]:36616 "EHLO mailhst2.its.tudelft.nl") by kanga.kvack.org with ESMTP id ; Mon, 13 Nov 2000 08:07:19 -0500 Received: from arthur.ubicom.tudelft.nl (erik.et.tudelft.nl [130.161.48.56]) by mailhst2.its.tudelft.nl (8.9.3/8.9.3) with ESMTP id OAA13625; Mon, 13 Nov 2000 14:08:29 +0100 (MET) Received: (from erik@localhost) by arthur.ubicom.tudelft.nl (8.9.3/8.9.3/SuSE Linux 8.9.3-0.1) id OAA11830; Mon, 13 Nov 2000 14:06:41 +0100 Date: Mon, 13 Nov 2000 14:06:41 +0100 From: Erik Mouw To: aprasad@in.ibm.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: reliability of linux-vm subsystem Message-ID: <20001113140641.A11229@arthur.ubicom.tudelft.nl> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0.1i In-Reply-To: ; from aprasad@in.ibm.com on Mon, Nov 13, 2000 at 05:29:48PM +0530 Organization: Eric Conspiracy Secret Labs X-Eric-Conspiracy: There is no conspiracy! Return-Path: X-Orcpt: rfc822;linux-mm@kvack.org On Mon, Nov 13, 2000 at 05:29:48PM +0530, aprasad@in.ibm.com wrote: > When i run following code many times. > System becomes useless till all of the instance of this programming are > killed by vmm. Good, so the OOM killer works. > Till that time linux doesn't accept any command though it switches from one > VT to another but its useless. VT swithing is done by the kernel itself, not by a process. > The above programme is run as normal user previleges. > Theoretically load should increase but system should services other users > too. No. The system would *like* to service other processes, but it *can't* because it is trashing. > but this is not behaving in that way. > ___________________________________________________________________ > main() > { > char *x[1000]; > int count=1000,i=0; > for(i=0; i x[i] = (char*)malloc(1024*1024*10); /*10MB each time*/ > > } > _______________________________________________________________________ > If i run above programm for 10 times , then system is useless for around > 5-7minutes on PIII/128MB. Sounds quite normal to me. If you don't enforce process limits, you allow a normal user to thrash the system. Erik -- J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department of Electrical Engineering, Faculty of Information Technology and Systems, Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands Phone: +31-15-2783635 Fax: +31-15-2781843 Email: J.A.K.Mouw@its.tudelft.nl WWW: http://www-ict.its.tudelft.nl/~erik/ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux.eu.org/Linux-MM/