From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752991AbZFMDsr (ORCPT ); Fri, 12 Jun 2009 23:48:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751942AbZFMDsj (ORCPT ); Fri, 12 Jun 2009 23:48:39 -0400 Received: from mail-px0-f187.google.com ([209.85.216.187]:51554 "EHLO mail-px0-f187.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751581AbZFMDsj convert rfc822-to-8bit (ORCPT ); Fri, 12 Jun 2009 23:48:39 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; b=gDIWd68embzacnlmkxnyyWIQKVUqiIpEW/ENwOi6Qa07XBsEQSHzVOjw2wXrkaKAZy +asfY0bbxTu88OpTdOunRpcimmTghHp4gI9MWuSiOHsQ4T9e3fZRQy/eSJ9GFSKy9hvp nIq6NqvzppclmX5OU7la1Ff8oBmqFEMvPllzU= MIME-Version: 1.0 In-Reply-To: <20090611191152.GD16787@mit.edu> References: <9b1675090904041103v477913a5of06fa5c10ebee05f@mail.gmail.com> <9b1675090904041131u28635d8dnc3d13e88000394b4@mail.gmail.com> <20090405011355.GE7553@mit.edu> <9b1675090904042117k77463227y66a872d52d027e7e@mail.gmail.com> <9b1675090904042125g708076e6v665f5ecc7fa020a4@mail.gmail.com> <9b1675090904042313rb8178b6v1da3aeddfa57a869@mail.gmail.com> <20090405062626.GA7760@mit.edu> <9b1675090904051542o42a0ca11y1ce3b691ed6d8ebb@mail.gmail.com> <9b1675090906062014h2ce44d8apc50f73aa036d9139@mail.gmail.com> <20090611191152.GD16787@mit.edu> Date: Fri, 12 Jun 2009 21:48:41 -0600 Message-ID: <9b1675090906122048o35698c09x13cc7cf7650ac9ae@mail.gmail.com> Subject: Re: IO latency - a special case From: "Trenton D. Adams" To: Theodore Tso , "Trenton D. Adams" , Linux Kernel Mailing List Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Sorry I didn't reply earlier. I got busy with some server troubles and such. On Thu, Jun 11, 2009 at 1:11 PM, Theodore Tso wrote: > On Sat, Jun 06, 2009 at 09:14:43PM -0600, Trenton D. Adams wrote: >> I'm back into doing some Java development, and it's happening again. >> I'm running 2.6.30-rc7, and I did a SysReq+T, I hope this is helpful. >> I've attached a txt.gz file, because it's 367K to my >> /var/log/messages. >> >> The important stuff, I believe, is the Java related stuff.  As a quick >> refresher to this problem, it appears to be related to how my Java IDE >> saves the file, and perhaps something doesn't release the futex right >> away? > > Have you checked your memory usage via SysReq-m, or /proc/meminfo or > simply using "free".  I'm seeing a lot of processes in do_page_fault, > which is interesting, especially in the non-Java processes. I wasn't even aware of a SysReq-m. I'll try that next time. I do wish the Macbook had a hard drive activity light *rolls eyes*. > > Back in April, your vmstat output didn't show much swapping activity, > but maybe there was more paging activity that didn't show up there? Not sure I understand. Paging without swapping? I thought they were one in the same, please explain; it's been a long time since I studied kernel related theory. > >> I've also seen these symptoms previously... >> >> 1. Problem arises, I Ctrl-C the process when I notice the system >> getting really sluggish. >> 2. Start process again, and it locks up the machine for about an hour > > What sort of process where you typicalling trying to kill using ^C? It's maven, which spawns javac (java compiler), as well as does various other tasks such as making connections to the Internet, local directories, etc.