Roundtable

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2555 discussions

Solaris 10 DTrace and how it achieves zero probe effect
by Stuart Williams 11 Mar '05

11 Mar '05

Some of us at yesterday's presentation by Bryan Cantrill on Solaris 10 were wondering how DTrace can instrument kernel code with no extra speed overhead, or as he claimed, with zero probe effect, which is a much stronger claim than just no time penalty. The detailed answer is in their paper "Dynamic Instrumentation of Production Systems" available here: http://www.sun.com/bigadmin/content/dtrace/dtrace_usenix.pdf Here's the most relevant paragraph which explains how they do it for Function Boundary Tracing on SPARC (x86 is not as clean, surprise, surprise): On SPARC, FBT [Function Boundary Tracing] works by replacing an instruction with an unconditional annulled branch-always (ba,a) instruction. The branch redirects control flow into an FBT-controlled trampoline, which prepares arguments and transfers control into DTrace. Upon return from DTrace, the replaced instruction is executed in the trampoline before transferring control back to the instrumented code path. This is a similar mechanism to that used by Kerninst[13] -- but it is at once less general (it instruments only function entry and return) and completely safe (it will never erroneously instrument code executed at TL>0). How they did it for Statically-defined Tracing (section 4.2 in the paper) is also interesting, and as they admit, not quite zero probe effect because of potential register pressure on the compiler. The paper is a good read, especially after the presentation. Stuart Williams.

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[LinuxWorld] Early Bird Ends This Week for LinuxWorld & NetworkWorld (fwd)
by gedetil＠cs.umanitoba.ca 09 Mar '05

09 Mar '05

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Pioneer DVD burner
by Mike Pfaiffer 09 Mar '05

09 Mar '05

I'm the guy who asked about the Pioneer 109 tonight. I did a little checking on their site. Looks as though the firmware is up to date (the revision number is the same as reported by cdrecord). Although the date of the update is the day I bought the drive... Checking the FAQ it seems I may need an 80 pin cable (blue connectors) and I only have 40 pin cables (black connectors) in my machine. I tried 24X and K3B said either the drive or media couldn't handle that speed so it dropped back to 4X. The drive is rated for 40X and the media is rated for 48X. The next attempt is going to be 16X (which is what I was getting from the previous DVD burner). The read/verify is lightning quick though. cdrecord reports things the way they should be. I checked some configuration files and they confirmed what the DVD drive was. I haven't tried playing anything from it yet... Any thing I might have missed? I'll probably try the update in a day or so. Later Mike -- +----------------------------------------------------------------------+ | Digital Civilization magazine: http://www.digitalcivilization.ca | |Call-A.P.P.L.E. and the Digital Civilization http://www.callapple.org | | http://members.shaw.ca/pfaiffer = Mike Pfaiffer (B.A., B.Sc.) | +----------------------------------------------------------------------+ ----- BEGIN GEEK CODE BLOCK ----- Version: 3.12 GCS/G/IT/PA/SS d s+:- a? C++ UL L++ W++ N++ o+ K- w(---) O+@ M++@ V PS+ PE !PGP t+ 5+ X R tv b+ DI+++ D++ G e++* h! r-- !y-- UF++ ------ END GEEK CODE BLOCK ------

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[Fwd: Job Oportunity]
by John Lange 03 Mar '05

03 Mar '05

If you are interested, please send your resume directly to the address listed below (not to me). -----Forwarded Message----- > From: Paulo Teves <pteves(a)realenetsolutions.com> > Also, do you have any contacts with good software developers, > experienced in open source technologies? Individuals that may be > looking for some new employment opportunities? The reason why I ask > is that we placed a career ad in the Free Press a few weeks ago, but I > have been disappointed with the small number of good candidates. In > the past I have interviewed many developers with experience in > Microsoft technologies, and the number of qualified candidates was > usually quite high. -- John Lange OpenIT ltd. (204) 885 0872

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MUUG Meeting, Mar 8, 7:30pm -- MythTV
by gedetil＠cs.umanitoba.ca 01 Mar '05

01 Mar '05

[Posted to man.unix.general and other news groups] ------ Forwarded Article <d028cr$ne6$1(a)canopus.cc.umanitoba.ca> ------ From gedetil(a)cs.umanitoba.ca (Gilbert E. Detillieux) The Manitoba UNIX User Group (MUUG) will be holding its next monthly meeting on Tuesday, March 8. The meeting topic for this month is as follows: MythTV Shawn Wallbridge will be presenting on MythTV. MythTV turns your PC running Linux into a personal video recorder, like a Tivo, with some neat features. * Basic 'live-TV' functionality. Pause/Fast Forward/Rewind "live" TV. * Support for multiple tuner cards and multiple simultaneous recordings. * Distributed architecture allowing multiple recording machines and multiple playback machines on the same network, completely transparent to the user. * Compresses video in software using rtjpeg (from Nuppelvideo) or mpeg4 (from libavcodec). Full support for Hardware MPEG-2 encoder cards (Hauppauge PVR-250 / PVR-350). Preliminary support for DVB cards and the new pcHDTV tuner card. * Support for the (very nice looking) hardware MPEG-2 decoder and TV out present on the Hauppauge PVR-350. * Completely automatic commercial detection/skipping. * Grabs program information using xmltv. * A fully themeable menu to tie it all together. Shawn will show how to get it all set up with the least amount of effort using KnoppMyth, a Knoppix based MythTV installer. The group holds its general meetings at 7:30 PM on the second Tuesday of every month from September to June. (There are no meetings in July and August.) Meetings are open to the general public; you don't have to be a MUUG member to attend. ********************************************************************** Please note our meeting location: The IBM offices, at 400 Ellice Ave. (between Edmonton and Kennedy). When you arrive, you will have to sign in at the reception desk, and then wait for someone to take you (in groups) to the meeting room. Please try to arrive by about 7:15 PM, so the meeting can start promptly at 7:30 PM. Don't be late, or you may not get in. Limited parking is available for free on the street, or in a lot across Ellice from IBM, for $1.00 for the evening. Indoor parking is also available nearby, at Portage Place, for $2.00 for the evening. ********************************************************************** For more information about MUUG, and its monthly meetings, check out their Web server: http://www.muug.mb.ca/ Also note that MUUG maintains two mailing lists, called "muug-announce" and "roundtable". If you're not already on these lists, we encourage you to subscribe now: http://www.muug.mb.ca/mailman/listinfo/ The "muug-announce" list is used for monthly meeting announcements (such as this one) as well as other important announcements of interest to MUUG members. The "rountable" list is meant to be a forum for follow-ups to topics discussed at the meetings, or for round-table-style discussion on other topics that come up between meetings. Of course, for this to be effective, we need to reach a certain critical mass. So, please subscribe, and stay involved! -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.mb.ca> Manitoba UNIX User Group Web: http://www.muug.mb.ca/ P.O. Box 130, St-Boniface Phone: (204)474-8161 Winnipeg, MB, CANADA R2H 3B4 Fax: (204)474-7609 ------ End of Forwarded Article

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Re: [RndTbl] dual video cards for Linux
by Shawn Wallbridge 22 Feb '05

22 Feb '05

I would expect them to be much slower, but I can't really say since I don't run them. I had heard that the 8500 drivers were pretty good, but I haven't heard anything regarding the nVidia open source driver. I can't see how the open source driver (nv) could be anywhere near as good as the binary (nvidia) since they don't have the access to documentation that nVidia does. I know nVidia is a really big supporter of Linux and does development internally using Linux (their Gelato 3D renderer was released for Linux first (at least the Beta was) and Windows later). The reason they can't release an open source driver is because of 3rd party intellectual property (or code) that is in the driver. At least that is my guess. shawn On 22-Feb-05, at 2:40 PM, Spencer Kuziw wrote: > Just curious -- how much worse (slower, buggier, etc..) are the open > source driver for nVidia or ATI on Linux? > > > Shawn Wallbridge said: >> If you can get over the nVidia binary license, you could get a dual >> head GeForce. >> >> If not, you could look into the Radeon 8500, I believe their is an >> open >> source driver for it. >> >> shawn >> >> >> On 21-Feb-05, at 8:09 PM, millward wrote: >> >>> What would be a good dual video card for Linux? >>> I'm not interested much in games, but it should >>> be OK for movies. I'd prefer open source drivers, >>> but I don't suppose there's much chance of that. >>> It would be great to read a program's documentation >>> on one screen while running it on the other. I'd >>> get things done a lot faster that way. >>> Any information would be most welcome. >>> >>> _______________________________________________ >>> Roundtable mailing list >>> Roundtable(a)muug.mb.ca >>> http://www.muug.mb.ca/mailman/listinfo/roundtable >> >> _______________________________________________ >> Roundtable mailing list >> Roundtable(a)muug.mb.ca >> http://www.muug.mb.ca/mailman/listinfo/roundtable >> > > > -- > The Seed Organization > >

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dual video cards for Linux
by millward 22 Feb '05

22 Feb '05

What would be a good dual video card for Linux? I'm not interested much in games, but it should be OK for movies. I'd prefer open source drivers, but I don't suppose there's much chance of that. It would be great to read a program's documentation on one screen while running it on the other. I'd get things done a lot faster that way. Any information would be most welcome.

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Solaris 10 Presentation in Winnipeg (fwd)
by gedetil＠cs.umanitoba.ca 22 Feb '05

22 Feb '05

Hi folks. Those of you who were at the February 8th MUUG meeting might recall my making a preliminary announcement about an upcoming presentation in Winnipeg on Solaris 10. Further details have since been forwarded to me, so I now pass it along to you. (This will be only two days after our next monthly meeting, so I thought I should give you all a "heads up" in case you want to register early.) What was sent to me was a PDF attachment, but rather than forward that to all of you, I thought I'd just extract the relevant text and include it below... (You can get the pretty pictures from their web site, if you like.) ---------------------------------------------------------------------------- It's Here. Solaris 10. Demanding businesses demand innovation that pays. Demanding businesses demand Sun. There's never been an operating system like the new Solaris(TM) 10 Operating System. It doesn't just promise lower operating costs and better performance. It actually delivers them - and more. YOU ARE INVITED! Please join Sun Microsystems of Canada for a Solaris 10 Lunch & Learn, as we bring one of our key Corporate Senior Engineers from the Sun Kernel Development Group across the Canadian Prairies. By attending this seminar you will learn about the benefits of the new Solaris 10 OS and how it can help you improve performance and make your operating environment more efficient and secure, while reducing complexity. Regina, Saskatchewan Wednesday, March 9th Ramada Hotel Winnipeg, Manitoba Thursday, March 10th Fairmont Winnipeg Edmonton, Alberta Wednesday, March 23rd The Westin Edmonton Calgary, Alberta Thursday, March 24th The Westin Calgary On a scale of 1 5, with 5 being the most technical, this session is rated a 4! Join us from 11:30am 2:30pm in a city close to you as Bryan Cantrill, Senior Staff Engineer, does an overview of Solaris 10 and then a deep-dive and demonstration of two of the most visible and meaningful features in Solaris 10: Dynamic Tracing (DTrace) and Containers. Register NOW at http://sun.ca/events/solaris10-seminar SPEAKER BIO: Bryan Cantrill is a Senior Staff Engineer in the Solaris Kernel Development Group at Sun Microsystems. His interests include dynamic software instrumentation, postmortem diagnosability, real-time kernel implementation and microprocessor architecture. Over his career, Bryan has done work in many kernel subsystems; most recently, he (with two colleagues) designed, implemented, and shipped DTrace, a facility for systemic dynamic instrumentation of Solaris that won the Sun 2004 Chairman's Award for Innovation and was hailed as a "brilliant piece of work" by SysAdmin magazine. Bryan received the ScB magna cum laude with honors in Computer Science from Brown University. Register NOW at http://sun.ca/events/solaris10-seminar ---------------------------------------------------------------------------- -- Gilbert E. Detillieux E-mail: <gedetil(a)cs.umanitoba.ca> Dept. of Computer Science Web: http://www.cs.umanitoba.ca/~gedetil/ University of Manitoba Phone: (204)474-8161 Winnipeg, MB, CANADA R3T 2N2 Fax: (204)474-7609

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Re: [RndTbl] Tips for isolating causes of system load
by John Lange 13 Feb '05

13 Feb '05

Thanks Sean. Based on that tip (I hadn't realized that "apachectl fullstatus" outputs to stdout) I have come up with just about the ugliest bash script every written! But it works... This takes the top 5 most CPU intensive processes and looks for the ones owned by the "www" user. It then re-greps for that process id so it can spit out the entire line from "ps". Then it also greps "apachectrl fullstatus" for the same PID so we can see what that process is actually doing. If this doesn't make you bash scripters out there cringe I don't think anything will... ;) --- for PID in `ps -weo pid,%cpu,user,args --sort %cpu |tail -n5|grep www|cut -f1 -d " "`; do ps -weo pid,%cpu,user,args --sort %cpu |grep -v grep|grep $PID ; apachectl fullstatus |grep -A1 $PID; done --- The obvious problems with this are: - It invokes way to many processes (some of them more than once) - loops through "fullstatus" every time. The only other problem is that lynx truncates the longer request lines at 80 columns so you are missing part of what the client is requesting that is causing the load. If anyone has some suggestions for how to clean that up please feel free to suggest them. I'm actually a bit dismayed that Apache doesn't have better command line tools for querying the status of the server. John On Sat, 2005-02-12 at 13:47, Sean Cody wrote: > > Anyone have any suggestions for a little bash script that could do this > > auto-magically? > > 'apachectl fullstatus' seems to work alright for me. Not immediately > as intuitive but it does work.

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Tips for isolating causes of system load
by John Lange 12 Feb '05

12 Feb '05

Does anyone know of a way from the command line to find out what specific apache process is doing? This needs to be something that could work in an automated way. Background: We sometimes have certain apache processes go out of control and consume too much CPU. The reason for this varies. Sometimes its users trying to write their PHP or Perl scripts or run some other process and some times its outside "attacks". For example, today we had to block a japanese robot that was written by a comp-sci class because it was attempting to index every day, of every month of every year of a users entire events calender. It was at the year 2015 and climbing before we stopped it. At the moment I can use top or ps to find out which process ID is causing the load and then view apache's /server-status/ to see which page requests are causing the issue. This is great except its a manual process and I can't always get to the console in time to identify the culprit. Anyone have any suggestions for a little bash script that could do this auto-magically? -- John Lange

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