From owner-freebsd-stable@FreeBSD.ORG Sun Sep 18 06:47:20 2011 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 96E30106566B for ; Sun, 18 Sep 2011 06:47:20 +0000 (UTC) (envelope-from ronald-freebsd8@klop.yi.org) Received: from fep19.mx.upcmail.net (fep19.mx.upcmail.net [62.179.121.39]) by mx1.freebsd.org (Postfix) with ESMTP id 193DD8FC08 for ; Sun, 18 Sep 2011 06:47:19 +0000 (UTC) Received: from edge01.upcmail.net ([192.168.13.236]) by viefep19-int.chello.at (InterMail vM.8.01.02.02 201-2260-120-106-20100312) with ESMTP id <20110918064718.NTGI2111.viefep19-int.chello.at@edge01.upcmail.net>; Sun, 18 Sep 2011 08:47:18 +0200 Received: from pinky ([213.93.232.119]) by edge01.upcmail.net with edge id a6nE1h01k2bDWHx016nFqt; Sun, 18 Sep 2011 08:47:18 +0200 X-SourceIP: 213.93.232.119 Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes To: "Jason Hellenthal" , "Jeremy Chadwick" References: <20110918045413.GA63773@DataIX.net> <20110918053901.GA31617@icarus.home.lan> Date: Sun, 18 Sep 2011 08:47:13 +0200 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: "Ronald Klop" Message-ID: In-Reply-To: <20110918053901.GA31617@icarus.home.lan> User-Agent: Opera Mail/11.51 (Win32) X-Cloudmark-Analysis: v=1.1 cv=7AjrSHUygkxmgKj9+ZdWPzZoKYzIcpgZMIt1Yxqn8hE= c=1 sm=0 a=lm4eusMn8AwA:10 a=4xaea3bvHo0A:10 a=bgpUlknNv7MA:10 a=kj9zAlcOel0A:10 a=QycZ5dHgAAAA:8 a=a14uRV0-AAAA:8 a=6I5d2MoRAAAA:8 a=JPUQt-R5AAAA:8 a=ZFPypKz17mWZlbVdIyEA:9 a=OKoq4wMFMrAPmcSCWm8A:7 a=CjuIK1q_8ugA:10 a=Ea5LKd3xFwUA:10 a=QrMgEKT2GQAA:10 a=HpAAvcLHHh0Zw7uRqdWCyQ==:117 Cc: "freebsd-stable@freebsd.org" Subject: Re: /usr/bin/script eating 100% cpu with portupgrade and xargs X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 18 Sep 2011 06:47:20 -0000 On Sun, 18 Sep 2011 07:39:01 +0200, Jeremy Chadwick wrote: > On Sun, Sep 18, 2011 at 12:54:13AM -0400, Jason Hellenthal wrote: >> On Sun, Sep 18, 2011 at 01:49:15AM +0200, Ronald Klop wrote: >> > Hi, >> > >> > I'm running portupgrade in screen to update all the ports for >> > 9-BETA2/9-CURRENT on amd64. While doing this script eats 100% cpu. >> > Because portupgrade -fa crashed I'm running this command to update the >> > remaining non-updates ports. >> > find /var/db/pkg -name +DESC -mtime +2 |cut -d / -f 5 | xargs time >> nice -n >> > 20 portupgrade -f >> > >> > The output of truss -p `pgrep script` is this: >> > clock_gettime(13,{1316301104.000000000 }) = 0 (0x0) >> > select(5,{0 4},0x0,0x0,{30.000000 }) = 1 (0x1) >> > read(0,0x7fffffffcdf0,1024) = 0 (0x0) >> > write(4,0x7fffffffcdf0,0) = 0 (0x0) >> > clock_gettime(13,{1316301104.000000000 }) = 0 (0x0) >> > select(5,{0 4},0x0,0x0,{30.000000 }) = 1 (0x1) >> > read(0,0x7fffffffcdf0,1024) = 0 (0x0) >> > write(4,0x7fffffffcdf0,0) = 0 (0x0) >> > clock_gettime(13,{1316301104.000000000 }) = 0 (0x0) >> > select(5,{0 4},0x0,0x0,{30.000000 }) = 1 (0x1) >> > read(0,0x7fffffffcdf0,1024) = 0 (0x0) >> > write(4,0x7fffffffcdf0,0) = 0 (0x0) >> > clock_gettime(13,{1316301104.000000000 }) = 0 (0x0) >> > select(5,{0 4},0x0,0x0,{30.000000 }) = 1 (0x1) >> > read(0,0x7fffffffcdf0,1024) = 0 (0x0) >> > write(4,0x7fffffffcdf0,0) = 0 (0x0) >> > >> > So it is really fast in reading and writing 0 bytes most of the time. >> > >> > I also found >> http://web.archiveorange.com/archive/v/6ETvLvjo60Gj9geAUAb6 >> > and I think I am better of by rewriting my command so stdin/stdout is >> > still the terminal. Although the link is a couple of years old. >> > >> > Is this known? Can somebody explain me why my xargs command is not >> working >> > well? >> > >> >> Are you absolutely sure that its script(1) causing this ? 100% CPU usage >> has been a known side effect of screen(1) for quite some time. Rebuild >> it and try again. > > Jason's referring to this, I believe: > http://www.freebsd.org/cgi/cvsweb.cgi/ports/sysutils/screen/Makefile#rev1.55 > > To clarify the what the commit message means: it does not mean "when the > package is installed the installation takes up 100% CPU". It means > "once the package is installed and screen is used, screen takes up 100% > CPU". I know because I've seen this behaviour in the past (one of the > many, many reasons I build ports from source). > > However: > http://www.freebsd.org/cgi/cvsweb.cgi/ports/sysutils/screen/Makefile#rev1.78 > > So: If a binary package is being installed through your above > portupgrade command, and you're seeing this problem, then it sounds to > me like commit revision 1.78 is a regression and NO_PACKAGE should be > put back into place + packages removed from all mirrors. > > There are many reasons to not use GNU screen at all, or if you must have > something like it, use tmux. I recently had to provide an analysis of > how GNU screen destroys one's terminal[1]; so if the above problem turns > out to be caused by GNU screen as well, I'll just add it to my > ever-growing list of reasons the software should be nuked from orbit. > > Otherwise, if this turns out to be a problem with portupgrade (which you > found some evidence supporting such), then the solution is simple: stop > using portupgrade, use portmaster (if it lacks things you need ask Doug > Barton, he's incredibly receptive to adding new features/fixing things). > Two databases that aren't compatible, ruby shims, and other crap = not > worth it. Think the database ordeal is long over with/fixed/whatever? > It isn't[2]. > > [1]: > http://lists.freebsd.org/pipermail/freebsd-stable/2011-June/063052.html > [2]: > http://www.dslreports.com/forum/r26304856-FreeBSD-defining-portmaster-alias > I have a repeatable test. Run top in a window and this command in another. $ echo test | script /tmp/script-test sleep 1000 Script started, output file is /tmp/script-test test PID USERNAME THR PRI NICE SIZE RES STATE C TIME CPU COMMAND 29656 ronald 1 103 0 12324K 1244K CPU4 4 1:03 100.00% script So it has nothing to do with portupgrade or screen. The output of truss -p29656 is the same as posted previously. Ronald.