Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 13 Nov 2000 08:08:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 13 Nov 2000 08:08:50 -0500 Received: from mailhst2.its.tudelft.nl ([130.161.34.250]:37896 "EHLO mailhst2.its.tudelft.nl") by vger.kernel.org with ESMTP id ; Mon, 13 Nov 2000 08:08:40 -0500 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> In-Reply-To: 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! X-Loop: erik@arthur.ubicom.tudelft.nl Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/