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| | Hyperthreading |
 | | The software has to be re-written and the instructions be rearranged in a way that they can be multitasked. | | | Hyperthreading is the latest product of Intel, one of the leading manufacture companies in the computer market. | | | Hyperthreading technology makes a single a single physical processor appear as multiple logical processors; simply put, the physical execution resources are shared and the architecture state is duplicated for each logical processor. |
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http://www.ecst.csuchico.edu/~milhan/dir/Csci380/ht.html
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| | PCWorld.com - Intel Brings Hyperthreading to Notebooks |
| | Hyperthreading sends software instructions that aren't dependent on the execution of other instructions to those unused execution units, allowing the processor to do more work than it normally could. | | | Hyperthreading started off as a server technology on Intel's Xeon chips, but the company introduced it on its desktop Pentium 4 processors last year. | | | Hyperthreading operates independently of Intel's SpeedStep technology, designed to manage a notebook processor's power consumption, an Intel spokesperson said. |
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http://www.pcworld.com/news/article/0,aid,112606,00.asp
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| | CGTalk - Do AMD64 (s939) have some sort of HyperThreading? |
| | hyperthreading is a technology my intel, simulating a dual CPU performance with one CPU. | | | SUN and IBM will use Hyperthreading as well. | | | 01-28-2005 03:36 AM Hyperthreading is merely Intel's way to feed extra bits of information through the P4's stretched pipeline. |
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http://forums.cgsociety.org/printthread.php?t=205568
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| | PCWorld.com - Two CPUs in One? |
| | Though software doesn't need to be optimized in order to use hyperthreading, vendors can tweak their programs to utilize the technology better, says Intel's Fravel. | | | Nevertheless, hyperthreading remains a very new technology, and Intel anticipates further performance improvements as applications are modified to take better advantage of it. | | | And on tests specifically designed to expose the benefits of hyperthreading, many improvements were too slight to be detectable by the average user, except with select filters in Adobe Photoshop, with various video and photo programs such as Adobe Premiere and Roxio VideoWave, and on certain multitasking tests. |
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http://www.pcworld.com/news/article/0,aid,107492,00.asp
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| | OEMs Give Hyperthreading Mixed Reviews |
| | The hyperthreading technology in the current 3.06-GHz processor allows the processor to work on two threads at once, capitalizing on the tendency that applications have to work on chunks of intermittent data, rather than a single uninterrupted stream. | | | The new processor combines two elements: the "nice round number" of 3.0-GHz, and the hyperthreading technology, which has been heavily touted by Intel throughout the past year. | | | Hyperthreading takes advantage of multitasking, something users will do more and more of, Intel executives said at a press event in San Francisco this week. |
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http://www.extremetech.com/article2/0,3973,702573,00.asp
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| | Workstation makers switch off Intel tool Tech News on ZDNet |
| | Hyperthreading, announced in August 2001, is Intel's take on simultaneous multithreading, a microprocessor design concept that essentially makes a chip behave more efficiently. | | | With other software, hyperthreading could even be a drawback. | | | Conceivably, the workstation experience could also provide a litmus test of what some PC makers might do with hyperthreading come Nov. 14, when the technology arrives on desktop computers. |
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http://news.zdnet.com/2100-9584_22-963942.html
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| | Intel Hyperthreading = Hyper pooness - Dev Hardware |
| | The fact that a computer with hyperthreading enabled runs benchmarks slower is a well known fact. | | | Discuss Intel Hyperthreading = Hyper pooness in the Intel Processors forum on Dev Hardware. | | | Intel Hyperthreading = Hyper pooness - Dev Hardware |
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http://www.devhardware.com/forums/intel-processors-30/intel-hyperthreading-hyper-pooness-22779.html
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| | Hyper-Threading Performance Analysis |
| | In brief, hyperthreading (initially referred to as Simultaneous Multi-threading or SMT) allows for a single physical processor to appear to the operating system as two logical processors. | | | To examine the performance impacts that hyperthreading has on our suite of benchmarks I enlisted Hooz to assist me in collecting the necessary data. | | | Once the dust had settled and I compared the numbers with that of our 2000+ Athlon MP system, it seemed that the numbers were at the very least close in the majority of our benchmarks. |
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http://www.2cpu.com/articles/43_1.html
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| | Study: Intel's hyperthreading could expose servers - Computerworld |
| | Hyperthreading processors also ship on desktop PCs, but this particular flaw is a problem only for servers, Percival said on his Web site. | | | But a certain amount of instructions from one process remain in the cache of a hyperthreading processor while the next process is running, allowing one process to learn the partial contents of the other process, he said. | | | On Intel's Pentium 4 and Xeon processors, both of which feature hyperthreading, the cache is divided into portions known as Level 1, Level 2 or Level 3. |
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http://computerworld.com/securitytopics/security/story/0,10801,101769,00.html
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| | My-ESM - Intel Xeon processors already employ Hyperthreading |
| | He declined to project when the Hyperthreading function on the chip "will be turned on," but said the processor-plus capability definitely will be available next year. | | | He said Hyperthreading will be first available either in the two-way Xeon server chip or the multiprocessor version, and then quickly on both chips. | | | SAN JOSE -- Hyperthreading -- Intel's self-proclaimed trickery to make a single processor look like two virtual MPUs -- is already implemented on the currently available Xeon workstation chip, but not activated. |
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http://www.my-esm.com/digest/story/OEG20010829S0079
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| | Geek.com Geek News - Linux first to P4 HyperThreading |
| | The Inquirer is reporting that Linux is the first operating system to receive support for Intel's HyperThreading technology. | | | It may not be *supported* and may fail in newer versions of the chip, but in the mean time it lets us all see how the technology performs, and puts pressure on *both* Intel and MS to release it properly. | | | Linux does provide a function which queries the CPU to determine how many siblings are actually present. |
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http://www.geek.com/news/geeknews/2001dec/bch20011210009227.htm
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| | Ace's Hardware |
| | Next you need an operating system which is optimized for HyperThreading such as Windows XP and the latest 2.4 Linux kernel. | | | But at IDF Fall 2001, Intel unveiled jackson technology, officially known as "HyperThreading." Like out-of-order execution, HyperThreading or SMT is a means to increase overall performance per clockcycle. | | | The idea is to execute two threads, or "tasks," at the same time on the same processor (read more about threads and processes here). |
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http://www.aceshardware.com/read.jsp?id=50000319
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| | Wireless: NewsFactor Network - - What Hyperthreading Can (and Can't) Do for You |
| | For hyperthreading, software support is in the early stages. | | | For software to benefit from hyperthreading, the program must support multithreaded execution -- that is, it must allow two distinct tasks to be executed at the same time, | | | Without hyperthreading, a chip would have to process the two threads sequentially rather than simultaneously. |
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http://www.wirelessnewsfactor.com/perl/story/21119.html
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| | Geek.com Geek News - HyperThreading implementation in Windows XP |
| | Help me to know if i have to load the unix on my computer by using hyperthreading and we have windows xp as an operating system. | | | HT is a feature of the CPU itself (not motherboard, chipset, or other component) that allows the operating system to see more than one logical CPU (it's called "logical" because there is only one CPU--it just appears as two). | | | Can HyperThreading be easily upgraded by a DIYer like me? I have a VAIO running on WinXp Home, with 1.80GHz processor, 520MB RAM...some help my Geekfellas. |
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http://www.geek.com/news/geeknews/2002jan/bch20020110009694.htm
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| | Intel Touts Hyperthreading in P4 |
| | Hyperthreading, which first appeared in Intel Xeon chips for workstations and servers this year, enables software to take greater advantage of untapped computing power within a processor. | | | But while Intel's demonstrations showed hyperthreading winning out in running multiple programs simultaneously, the performance edge was less prominent in one-on-one comparisons of applications, due to the individual applications lack of full support for the new technology. | | | In servers, where many applications are designed for multiprocessor systems, the technology provides an up to 30 percent boost, but Intel says hyperthreading will also run applications up to 25 percent faster in the consumer PC environment as well, even though most software sold to home users is not designed for multiprocessors. |
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http://www.eweek.com/article2/0,3959,524969,00.asp
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| | Beyond3D - Which was nice. |
| | HyperThreading is not actually new, since this has been in server CPUs for a while, but this is the first time that its been brought to the desktop space -- possibly partly because it wasn't until Windows XP that the mass desktop/consumer OS was multi-processor aware. | | | The reality is very far from that ideal case, though, and much of the available processing time goes unused because the processor is often waiting for other things, such as an unforeseen branch in the program requiring the CPU to fetch different instructions. | | | However, this can operate in multi-processor environments as well, such that if you are utilising two HyperThreaded CPUs you'll have two physical CPUs, but the system will recognise four virtual CPUs. |
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http://www.beyond3d.com/reviews/intel/p4306/index.php?p=2
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| | Windows 2000 and the hyperthreading nightmare |
| | In Windows XP a hyperthreaded P4 will be recognized as a single processor containing two logical processors. | | | Windows NT 4.0 and Windows 2000 were both released before hyperthreading was implemented on Intel CPUs. | | | I’ve never noticed a difference (Windows 2000 Server with a dual Xeon hyperthreaded system) but I must be honest and say that I’ve never ran any benchmarks to compare the difference. |
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http://www.theinquirer.net/?article=18428
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| | [No title] |
| | With a hyperthreaded processor, instead of waiting around for the pipeline to come unblocked the chip can just continue executing instructions from the non-stalled thread; so instead of the processor's throughput going to zero as a result of a stall, it merely slows down. | | | A few days ago, and Intel representative made two statements to a Geek.com interviewer that have since become the cause of some controversy: 1) that the desktop version of the Pentium M would not be hyperthreaded, and 2) that a dual-core version of Prescott is in the works. | | | This improved branch prediction, in combination with its shorter pipeline, means improved execution efficiency and less of a need for something like hyperthreading. |
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http://arstechnica.com/articles/paedia/cpu/prescott.ars/1
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| | Intel hyperthreading shows Digital roots CNET News.com |
| | Intel's hyperthreading, which involves breaking up an application for easier digestion by a computer's processors, derives in part from work on simultaneous multithreading performed by a team of researchers at the University of Washington and Digital, an Intel representative confirmed. | | | Nonetheless, technologies with Digital genes march on, including HyperTransport, a high-speed method of chip interconnection championed by Advanced Micro Devices; a future version of Intel's Itanium family of processors; and low-power chips for cell phones and handhelds from both those companies. | | | Although Digital often floundered when trying to sell its own chips, the defunct computing giant left behind technologies and engineers that are at the core of many recent and coming advances. |
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http://news.com.com/2100-1001-961495.html
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| | Intel claims hyperthreading produces 900%+ boost |
| | If this were a valid way to benchmark, Intel would have made the case for dual processor systems the same way. | | | With only one logical processor it would take the Excel software an exagerratedly long time to compute. | | | Just like you won't get double performance by adding a second physical processor, you won't get 9-10 times performance by adding a second "logical" processor, unless the programs being ran are rigged to do so. |
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http://www.freerepublic.com/focus/news/801828/posts
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| | Mindful Musings » Enable Hyperthreading after upgrading motherboard |
| | Many sites on the internet suggest that in order to upgrade your computer to use the Hyperthreading on a Pentium 4 you have to upgrade the driver under the device manager. | | | Additionally, considering that hyperthreading was enabled during the first installation, I question whether or not a second installation of XP-Pro and SP2 (ref. Microsoft Solution) would be an effective fix to the problem. | | | I checked this out on my hyperthreaded XP install by using file properties => original file name and the original file names are there – so i hesitate to copy the files again. |
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http://mindfulmusings.net/weblog/2004/10/16/enable-hyperthreading-after-upgrading-motherboard
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| | DUC: How Important is it to disable Hyperthreading? |
| | Turns out my computer doesn't even have Hyperthreading. | | | For those of you unfamiliar with Hyperthreading just check the way I described and/or consult your computer manual and/or representative to figure out if Hyperthreading even applies to your situation. | | | As I've now discovered a quick way to figure out if your computer has Hyperthreading or not is to open Task Manager and click the Processes tabs. |
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http://duc.digidesign.com/showflat.php?Number=770823
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| | [No title] |
| | 2 CPUs, hyperthreading is on, but the system is has been forced to use 2 logical CPUs only via “/NUMPROC=2” in boot.ini file. | | | 2 CPUs, hyperthreading is turned on, and all 4 logical CPUs are enabled. | | | I made the Single CPU, Hyperthreading Off configuration the benchmark baseline at 100%. |
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http://home.insightbb.com/~george/Hyperthreading/Hyperthreading.html
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| | Short-Media Forums - How to Enable Hyperthreading In Dell OTS |
| | Exactly -- hyperthreading is essentially enhanced multi-tasking that enables a CPU to split its working capacity more efficiently between simultaneously running programs and apps. | | | I knew it was very different from SMP, however i's under the impression that it worked transparent to the OS as if it was an SMP machine. | | | I've got three Dell Octapus (Octiplex) 270 computers at the office, all of which have Intel P4 2.8GHz/800Mhz CPUs. |
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http://www.short-media.com/forum/printthread.php?t=12085
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| | The Basics of HyperThreading: What is it? - PCStats.com |
| | The OS assigns operations to the independent logical processors, and so if it's determined that one of the logical CPU's is to remain idle, the OS will issue a HALT command to the free logical processor thus devoting all of the other system resources to the working logical processor. | | | The last example is of dual HyperThreading enabled processors which can work on four independent threads at the same time. | | | In the last HyperThreading enabled processor, both threads are simultaneously being computed, and the CPU's efficiency has increased from around 50% to over 90%! |
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http://www.pcstats.com/articleview.cfm?articleID=1302
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| | HotHardware.com |
| | Supported by the Intel 850 and i845 chipsets, with Hyperthreading support in i845E/PE/GE/GV/G and i850E chipsets. | | | Whether it be Multimedia processing along with simultaneous end user sessions of email, desktop publishing or spreadsheet analysis, the host CPU is typically servicing multiple requests on its resources. | | | Think of it as a "virtual SMP" (Symmetric Multi-Processing) technology of sorts, only performed all on one processor. |
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http://www.hothardware.com/viewarticle.cfm?articleid=266
(762 words)
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| | dBforums - ASE and hyperthreading |
| | In "Optimizing Performance on Adaptive Server® Enterprise 12.5 on Linux" (http://www.sybase.com/detail?id=1025313) there is a tip to switch off hyperthreading, but without any explanation, and it seems to me that this tip is only meant for 1 CPU machines. | | | If there are many smaller tasks then the CPUs would perform better with hyperthreading enabled because then the different parts of the CPU are utilized better. | | | We are planning to migrate our Sybase ASE servers to Linux on servers with 2 and 4 Intel Xeons. |
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http://www.dbforums.com/t900150.html
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| | The Old New Thing : How does Windows exploit hyperthreading? |
| | For Windows NT and Windows 2000, the answer is "It doesn't even know." These operating systems are not hyperthreading-aware because they were written before hyperthreading was invented. | | | And back to hyperthreading: I can offer a real-life example of when it hurts performance. | | | And if hyperthreading is accepted as viable (and becomes pervasive), it seems a necessary step. |
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http://blogs.msdn.com/oldnewthing/archive/2004/09/13/228780.aspx
(3581 words)
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| | Forums - HyperThreading Question |
| | From task manager, it would appear that a single process on a dual CPU machine could consume 100% of the CPU time of one of the CPU's... | | | With hyperthreading, you have the 'appearance' (in task manager) of four CPU's. | | | I remember reading on the Intel website, that dual processor machines should have HT turned off. |
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http://www.elitetrader.com/vb/printthread.php?threadid=50457
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| | NWC Buzzcut 3 GHz, Hyperthreading and You November 12, 2002 |
| | The truth is, hyperthreading will provide tremendous performance gains across a wide array of usage scenarios, from general business computing (where drivers, services and agents all compete for CPU cycles) to use by knowledge workers and other power users who run multiple apps. | | | Compounding the issue is the incorporation of hyperthreading technology, a first in mainstream desktops. | | | Now that Intel is poised to release its first 3-GHz processor, IT shops everywhere are scrambling to understand how this watershed in CPU development will impact their PC-purchasing strategies. |
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http://www.networkcomputing.com/1324/1324buzz2.html
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| | Hardware Analysis - Forum - Hyperthreading |
| | so my best understanding of hyperthreading is the comp is tricked into thinking there is 2 processors present and cpu usuage will not go above 50% therefore you can multitask while you are doing cpu intense apps and you should have plenty of processing power available to do so. | | | I have yet to see any distributed computing exe benefit from hyperthreading. | | | An infinite number of monkeys typing into an infinite number of computers would eventually produce Windows XP....... |
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http://www.hardwareanalysis.com/content/topic/14584
(1332 words)
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| | NewTek Discussions - hyperthreading |
| | So if you are running Windows XP you could enable hyperthreading and your system would see FOUR virtual processors. | | | Should it be this way, or should I enable it. | | | Acutally, the system will see the 1st logical CPU on each Physical CPU. |
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http://vbulletin.newtek.com/showthread.php?t=1916
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| | Hyperthreading and Java |
| | And considering the level Java is abstracted away from the hardware, it's entirely possible that you could end up with two Java threads executing CPU intensive tasks on A1 and A2. | | | > > Note that hyperthreading isn't always a good thing: > > /> > > > Windows XP and Windows Server 2003 are hyperthreading-aware. | | | Most likely they were being bit by this problem (or something similar) - note that in the case I'm referring to, I think they were running an OS other than Windows. |
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http://www.codecomments.com/Java_Help/message364420.html
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| | Keith Devens - Weblog: Hyperthreading - January 07, 2004 |
| | And here's a link to an Intel whitepaper on hyperthreading. | | | To help explain all this stuff, someone linked to MIT's OpenCourseware for their graduate-level Computer System Architecture course. | | | Here's a link to the main article: Exploring Hyper-threading Performance - Part I |
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http://keithdevens.com/weblog/archive/2004/Jan/07/hyperthreading
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| | NewsFactor Network - - A Linux Mystery: Configuring for Virtual Processors |
| | Though hyperthreading is fully supported in the 2.4 and 2.5 Linux code bases, a broader range of applications will get performance improvements from hyperthreading in Linux 2.6, Dan Frye, director of the Linux technology center at | | | In that instance, the applications will compete for resources, such as caches, resulting in a performance improvement of only about 15 percent, he noted. | | | From a user perspective, the latest versions of the Linux kernel take full advantage of hyperthreading, Kris Kersey, site manager for Linuxhardware.org, told NewsFactor. |
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http://newsfactor.com/perl/story/21871.html
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| | Vendors 'slow to fix' hyperthreading flaw - ZDNet UK News |
| | Colin Percival detailed the vulnerability — which affects versions of Intel's CPU that use a technology called hyperthreading — at a conference on 13 May. | | | A researcher claims that Microsoft and some Linux vendors have put small businesses at risk with their slow reaction to a vulnerability in Intel's hyperthreading chip technology | | | Microsoft rejects IBM strategy and open source 'dorks' |
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http://news.zdnet.co.uk/hardware/chips/0,39020354,39200373,00.htm
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| | Hyperthreading, and some general info - Notebookforums |
| | The reason I asked whether the mobo supported it or not is because he seemed fairly sure it did (he checked with intel). | | | I also wouldn't mind the biometric scanner option | | | How could it hurt Sager to make the 3GHz an option? |
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http://www.notebookforums.com/showthread.php?p=1628#post1628
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| | Hyperthreading Moves Into Mainstream In 2003 |
| | Hyperthreading moves into hyperspeed throughout 2003, with the Canterwood and Springdale chipsets forming the backbone of Intel's desktop roadmap. | | | According to Intel roadmaps seen by ExtremeTech, Intel's desktop processors will extend up to and possibly beyond 3.6-GHz by the beginning of 2004, with Celerons cresting 2.5-GHz by the same timeframe. | | | Hyperthreading uses tread-level parallelism to fill in some of the gaps in a processor bus, when a processor is waiting for data, making the processor more efficient. |
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http://www.extremetech.com/article2/0,3973,907059,00.asp
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| | OpenMP and P4 hyperthreading |
| | It would be interesting to see if there are other programs or problems that can benefit from the hyperthreading. | | | I have run the NPB2.3 benchmark in C/OpenMP version on a dual Pentium Xeon system and found some interesting results. | | | For most of the benchmarks there is no gain in using hyperthreading, as expected, but the for the ep benchmark there is a significant speed up. |
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http://www.beowulf.org/pipermail/beowulf/2002-April/006951.html
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| | Hyperthreading under XP Pro |
| | I've been having a problem with enabling hyperthreading in WinXP. | | | My mobo picks up the processor as 2 3.06 GHz P4's, but XP treats it as one. | | | - Intel 3.06Ghz 800Mhz FSB HyperThreaded CPU: Good read! |
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http://www.ntcompatible.com/thread24591-1.html
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| | AnandTech - Hyperthreading help |
| | I have a new asrock 775v88, and a Intel 630 3.0Ghz, running XP Pro and can't figure out how to get the hyperthreading to work. | | | Question: Does the memory need to be Dual channel in order for hyperthreading to work? | | | The ram doesn't need to be in dual channel for hyperthreading to work, however your perfromance will suffer greatly if you aren't running dual channel. |
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http://forums.anandtech.com/messageview.cfm?catid=28&threadid=1690915
(848 words)
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| | Designtechnica Forums - HDD100/DMM 2.0 and Hyperthreading |
| | I better solution is to forget about DMM2.0 and use HDDtool instead which does not have problems with Hyperthreading. | | | "Our software is untested and stupid and cannot work with hyperthreading, so turn of hyperthreading". | | | Like hyperthreading is there just to switch it of, duh! |
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http://forums.designtechnica.com/showthread.php?t=5287
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| | hardCOREware Forum - HyperThreading... |
| | Most programs that take advantage of hyper-threading are ones like photoshop. | | | I have an 865G board, that supports 400,533,and 800MHZ system bus. | | | AMD and a new board.i have been askin alot of questions on the p4 or the AMD and i decided to go with the AMD64 3200+ ASUS board... |
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http://www.hardcoreware.net/forum/printthread.php?t=14740
(169 words)
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| | Hyperthreading - Notebookforums |
| | You can always switch WinXP to multiprocessor (which, techically, is what hyperthreading is) by upgrading the ACPI driver. | | | Very few applications even use multi threaded features (Photoshop is one that does). | | | and can't you manually set the affinity for processes even if they are not designed to take advantage of hyperthreading or multiprocessing? |
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http://www.notebookforums.com/showthread.php?p=90858#post90858
(471 words)
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| | [H]ardForum - AMD HyperThreading? |
| | HyperThreading is of course dealing with asyncronous multitasking or some highbrow Intel BS. | | | Wouldn't implementing some form of this help in multitasking and other applications that the P4 takes advantage of, would the shorter pipelines make the amd perform slower or is it just that Intel has it so they cant use it. |
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http://www.hardforum.com/printthread.php?t=809776
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| | Tom's Hardware Guide Processors: HyperThreading Threads Its Way into Application - Introduction |
| | The true benefits of HyperThreading will become manifest when applications based on Intel's new compiler are launched that will run on Intel's HyperThreaded Pentium 4. | | | We look at how software will employ HyperThreading, and what users can expect in the way of performance gains. | | | Intel has said, for example, that performance gains of 25% are achieved when an application runs on an HT-capable Pentium 4 processor while many of these touted performance gains will hinge on the compiler. |
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http://www6.tomshardware.com/cpu/20021227
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| | Intel: Hyperthreading to speed desktops CNET News.com |
| | SAN JOSE, Calif.--Intel will bring the performance-enhancing server technology known as hyperthreading to the desktop later this year, and plans to introduce technology in 2003 for securing data on hard drives. | | | Windows XP and 2000 are already hyperthreaded, he added. | | | The technology allows different elements of the chip, such as the integer unit for graphics processing and the floating-point unit for complex calculations, to be active at the same time. |
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http://news.com.com/2100-1001-957194.html
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| | Intel 'back in the driver's seat' The Register |
| | Significant clock increases and the introduction of hyperthreading into mainstream desktop PCs will enable Intel to meet Moore's Law, which implies a doubling of processor performance every 18-24 months. | | | Hyperthreading will help Intel to ensure that it keeps the faith with Moore's Law. | | | But in recent quarters it has been hit hard - by the downturn - and renewed competitive vigour from Intel. |
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http://www.theregister.co.uk/2002/10/08/intel_back_in_the_drivers
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| | Hyperthreading: Negative impact on performance? - Server |
| | Second, Intel wants to sell you hyperthreading because it's new and | | | The problem is that running two logical threads may overload the | | | hyperthreading might lose big - you only have to have a few percent |
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http://www.sqltalk.org/post-80100.html
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