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Topic: Read copy update

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Read-copy-update - Wikipedia, the free encyclopedia Read-copy-update (RCU) is an operating system kernel technology for improving performance on computers with more than one CPU. RCU is most useful when you have a data structure which is shared by multiple threads of execution, particularly when that data structure is frequently read and rarely updated. Splitting an update into removal and reclamation phases allows the updater to perform the removal phase immediately, and to defer the reclamation phase until all readers active during the removal phase have completed, either by blocking until they finish or by registering a callback that is invoked after they finish. en.wikipedia.org /wiki/Read-copy-update   (2016 words)

Read-Copy Update Mutual Exclusion for Linux Read-Copy Update was originally designed for DYNIX/ptx, a UNIX operating system from Sequent Computer Systems Inc., now a part of IBM. They update all the global references to the updated data with a new copy and use the callback scheme to free the old copy after all the CPUs have lost local references to it by going through a quiescent state (like a context switch). The writers (threads that update the data) however, have to use a special callback scheme to update the data. lse.sourceforge.net /locking/rcupdate.html   (1179 words)

Paul E. McKenney: Read-Copy Update (RCU) RCU was thus fully functional in 2.5.45 and later Linux kernels, just in time for the Halloween functionality freeze. The Reiser4 filesystem uses RCU to defer freeing of jnodes. Patches to replace many uses of brlock with RCU in the 2.5.69 kernel, with brlock being entirely eliminated in the 2.5.70 kernel. www.rdrop.com /users/paulmck/rclock   (591 words)

Avoiding Locks: Read Copy Update The real Read Copy Update code is a little more optimized than this, but this is the fundamental idea. Using RCU, the readers can avoid taking a lock altogether: as we expect our cache to be read more often than updated (otherwise the cache is a waste of time), it is a candidate for this optimization. RCU then waits until every other CPU has slept at least once: since readers cannot sleep, we know that any readers which were traversing the list during the deletion are finished, and the callback is triggered. www.kernel.org /pub/linux/kernel/people/rusty/kernel-locking/x490.html   (747 words)

Macromedia - Contribute Support Center : Downloads This update is for all users of the English version of Contribute on all platforms. Download and install the Contribute 3 trial to update Contribute 3 or 3.1 to 3.11. The Contribute 3.11 update contains a change to the activation/serialization process as well as a number of minor bug fixes. www.adobe.com /support/contribute/downloads.html   (537 words)

Introduction RCU can also improve performance of code modifying linked-list structures when there is a high system-wide aggregate update rate across all such structures [McK98a]. The past two years have seen much discussion of RCU, along with the design and coding of a number of implementations and uses of RCU, one of which is now part of the Linux 2.5 kernel [Sarma02]. Comparison of multiple RCU implementations [McK02a] showed, as noted in the abstract, that there is no overall best algorithm. www.usenix.org /events/usenix2003/tech/freenix03/full_papers/arcangeli/arcangeli_html/node1.html   (210 words)

Review: Fedora Core 1 is a Mild Disappointment - OSNews.com I read the script itself and saw that all it does is copy these two files (.xpt and.so) to the right directory and changes permissions with chmod 755. It is 2.6-ready, has better support for laptops, an updated Bluecurve theme with more color selection (default background image is lovely) and bumped up security. Update: Here is the bug report and a preliminary fix for it as found on Red Hat's bugzilla. www.osnews.com /story.php?news_id=5111   (1071 words)

Palm - Support - LifeDrive Update 2.0 Read the instructions in the installer carefully; they will guide you through backing up and restoring your personal data. Remember, during the update data on your device is erased. When the update is complete, your device will ask you to tap a series of targets. www.palm.com /us/support/downloads/lifedrive/lifedrive_update.html   (1478 words)

SCO v. IBM - Wikipedia, the free encyclopedia SCO Group claimed in a press release to have sent DMCA notification letters alleging copyright infringement [14][15] Alleged copies of these letters were posted online at Groklaw and LWN. Novell registered their claim to the copyright of original UNIX source code, effectively challenging SCO's registration of the same code. The letters give the names of 65 files in the Linux source code tree which supposedly incorporate "copyrighted binary interfaces". en.wikipedia.org /wiki/SCO_v._IBM_Linux_lawsuit   (3772 words)

[Irate Nate] read-copy-update I marveled at the technique (“copying whole data structures, wow; sounds useful”) and dismissed it as a mostly theoretical idea. Most recently, I discovered RCU is used in the Linux kernel; you can see this LWN article for a discussion about RCU before it actually landed in the kernel and the chapter in the Unreliable Guide to Locking elaborating on its proper usage in the kernel. Of course, the article referenced above indicates RCU (as it's known) has been in use for a while. www.cs.rose-hulman.edu /~froydnj/archives/2004/01/26/read-copy-update.html   (109 words)

Think Secret - Apple to announce updated iPods, sources say The iPod update could come as soon as the early part of this week, even Monday or Tuesday, but could also be in the ensuing weeks. This update could be the last for the iPod before it undergoes a major revamp. A review of the terms of use is required before reading, and our privacy policy is also available. www.thinksecret.com /news/februaryipods.html   (423 words)

JHymn Info and Help You may be asked to allow a Library Update to proceed for files that had already been converted before you interrupted the process. Can now read and process files with excess trailing data, files which used to be skipped over by JHymn for being badly formatted. Mac version of JHymn now uses scripted updating of the iTunes Library to create a more thorough break by unlocked files from their locked originals — this can solve some of the problems seen with the release of iTunes 4.7.1 and songs being unplayable and/or deleted from iPods. hymn-project.org /jhymndoc   (4641 words)

Compact Disc Recorded in Windows XP Is Missing Files or Folders or Is Unreadable You are able to read the disc in an MP3 player, but not all of the files on the disc are available. However, all of the files on the disc are available when you read the disc in Windows XP. You cannot read the disc by using Microsoft Windows 95 or Microsoft Windows 98, but you can read the disc in Windows XP. support.microsoft.com /?kbid=320174   (427 words)

Download details: Critical Update for Windows Media Player (All Versions) (KB828026) Read the Knowledge Base article for more information about this update. This update changes the way that Windows Media Player handles URL script commands that are embedded in a stream. To copy the download to your computer for installation at a later time, click Save or Save this program to disk. www.microsoft.com /downloads/details.aspx?FamilyID=af9cf65e-0c55-452e-a0fa-3aa165e667c1&DisplayLang=en   (262 words)

LWN: Patch: Read-Copy Update 2.5.26 + * @head: structure to be used for queueing the RCU updates. + * @arg: argument to be passed to the actual update function. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. lwn.net /Articles/5095   (791 words)

LaCie - External Hard Drives, DVD±RW Drives, Monitors LaCie is continuing to refine the updater tool to provide wider compatibility with computers already updated to XP SP2, or computers that have only a FireWire 800 interface. LaCie Update Tool v1.3.3 is now Mac OS X Tiger (10.4) compatible and adds the latest firmware support for d2 and Design by F.A. Porsche drives with FireWire 400 and 800 and/or USB 2.0 interface. If the update is not successful, your data may not be recoverable, even after drive repair. www.lacie.com /support/drivers   (1210 words)

Macromedia - Support : ColdFusion Updaters, Patches, and Hot Fixes Overview All updates check for a purchased, installed copy of the same version software, and require a valid serial number to install. Updates will not function as product upgrades and should not be downloaded for the purpose of upgrading your currently installed product. The ColdFusion MX Report Builder has also been updated for 7.0.1 and is available as a separate download. www.macromedia.com /support/coldfusion/downloads_updates.html#updater   (862 words)

Backup / copy changed files to cd, dvd, zip...: easy back up tool SmartDirCopy. If I finished a big permit application and can not afford the delay that would result if I lost the document and spreadsheet files, I want to create a copy on CD. After copying to the CD I wanted to be able to use Windows Explorer to see what is on the CD and to be able to open files from the CD or to be able to copy the files from the CD to my hard drive. Especially for users whose work is frequently updated but not backupped by a central system. hangvogel.hypermart.net /smartdircopy   (669 words)

Mini MP3 player comparison Read speed doesn't matter much, though, unless you're going to be using these things to move files. I want to be able to copy files to it and from it - audio I want to play, or just data I want to move, using the player as a glorified floppy disk. These things seem to pretty much play songs in the order they were copied onto the player; the first song you copy onto the empty player is the first one that plays. www.dansdata.com /usbmp3.htm   (5716 words)

Sequent computer systems - Wikipedia, the free encyclopedia You can check for Sequent computer systems in the deletion log, or read its nomination for deletion if there is one. If you created this article in the past few minutes and it has not yet appeared, it may not be visible due to a delay in updating the database. See the criteria for speedy deletion for possible reasons why it may have been deleted. www.sciencedaily.com /encyclopedia/sequent_computer_systems   (170 words)

USENIX Annual Technical Conference 2003, FREENIX Track - Abstract Read-copy update (RCU) allows lock-free read-only access to data structures that are concurrently modified on SMP systems. RCU is typically applied to read-mostly linked structures that the read-side code traverses unidirectionally. This paper combines ideas from several RCU implementations in an attempt to create an overall best algorithm, and presents a RCU-based implementation of the System V IPC primitives, improving performance by more than an order of magnitude, while increasing code size by less than 5% (151 lines). www.usenix.org /events/usenix03/tech/freenix03/arcangeli.html   (269 words)

HP Tru64 UNIX - Secure Shell (SSH) Support V3.2.3 Updates for SSH on Tru64 UNIX Version 5.1B are distributed as part of the Tru64 UNIX patch kits. It allows you to securely login to remote host computers, to execute commands safely on a remote computer, to securely copy files to/from a remote computer, to forward X11 sessions (on UNIX), and to provide secure encrypted and authenticated communications between two nontrusted hosts. If you do not have this software on your system, you may download it from Adobe's website. h30097.www3.hp.com /unix/ssh   (451 words)

RCU RCU is a reader-writer synchronization algorithm that uses multi-version and deferred-destruction techniques to allow readers to execute in parallel with writers, while avoiding expensive synchronization instructions. A longer term goal of the project is to develop tools that aid in the use of RCU and eventually lead to its automation. In this project we are defining the conceptual basis of RCU, designing and evaluating efficient implementions of it in SMMP operating system kernels, and exploring the software engineering challenges posed by RCU. www.cs.pdx.edu /~walpole/rcu.html   (248 words)

Update However, in our updates, we have consistently stressed that parents should discuss the risk of CJD with their sons and daughters as they get older. Please read the health alert we’ve provided and discuss this information with your doctor. Doctors also read reports about CJD and other health problems related to hGH treatment. endocrine.niddk.nih.gov /pubs/creutz/updatecomp.htm   (4608 words)

Michelle Malkin: WISCONSIN'S ELECTION FRAUD SCANDAL: WHERE'S THE MSM/DEM OUTRAGE? Update: Sean Hackbarth at The American Mind has details on Wisconsin's same-day registration regulations and more reporting here. And keep checking in at Boots and Sabers for continuous updates and round-ups of Wisconsin blogger coverage. Update II: Captain Ed does more election math. michellemalkin.com /archives/001262.htm   (608 words)

Daily Nightly: Predicting disaster - Nightly News with Brian Williams - MSNBC.com It turned out to be an advance copy of the script for this storm, predicting in unbelievable detail the level of destruction that was by now less than 24 hours away. To me it conjured up the image of a lone forecaster, known but to his or her co-workers, struggling to merge decades-old boilerplate Weather Service wording with the most vivid language possible in a final attempt to warn an entire region. They have all shelved their personal lives for now, and are doing astounding work on an achingly sad story that covers 90,000 square miles of the American South. www.msnbc.msn.com /id/9216831   (5941 words)

LLRX.com - Update to WTO/GATT Research If you need to read or cite an interpretive note, decision, declaration, act, understanding, amendment, or other document that is not published along with the agreements in this way, then search for it separately in BISD or in the other sources of GATT and WTO official documents described in section IV below. Update of all WTO dispute settlement cases (http://www.wto.org) >Trade Topics >Dispute settlement gateway page>Update. The Update includes summaries of the arguments and findings developed in each relevant dispute. www.llrx.com /features/wto2.htm   (6215 words)

IBM Research Israel Seminars An Analysis of Read-Copy-Update Techniques in Operating System Kernels I used these patterns to architect the implementation and use of RCU in the Linux 2.6 kernel, which was instrumental in improving the performance and scalability over that of the Linux 2.4 kernel. This talk demonstrates the performance problems of previous approaches, and analyzes the use of RCU techniques in earlier operating-system kernels in order to derive the needed design patterns. Empirical and analytic techniques are used to analyze the performance and simplicity benefits of RCU. domino.research.ibm.com /comm/wwwr_seminar.nsf/pages/sem_abstract_273.html   (330 words)

Read-Copy Update: Using Execution History to Solve Concurrency Problems We have delineated read-copy update’s area of applicability: Data structures that are often accessed and seldom updated, where a modest amount of memory may be spared for structures waiting on a quiescent period, and where stale data may be tolerated or can be suppressed. Read-copy update performance depends on the fraction f of data-structure accesses that modify that data structure, and on the degree to which read-copy callbacks may be batched. The keystone of read-copy update is the ability to determine when all threads have passed through a quiescent state since a particular point in time. www.rdrop.com /users/paulmck/rclock/intro/rclock_intro.html   (5744 words)

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