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Topic: HyperThreading

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	Hyperthreading
		As a spokesman from Intel Corp. puts it, “Today’s processors are one cook with one pan; the new hyperthreaded chip is still one cook, but with two pans.” A cook who works on two dishes at the same time should be able to complete work on both in less time overall.
		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.
		Hyperthreading technology can also be used with multiprocessors with giving almost same amount of performance gain.
	www.ecst.csuchico.edu /~milhan/dir/Csci380/ht.html (1619 words)

	OEMs Give Hyperthreading Mixed Reviews
		Hyperthreading requires a multithreaded OS and/or applications, each consisting of more than one chain or thread of instructions.
		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.
		Although hyperthreading is a microarchitectural improvement, the technology is dependent upon multithreaded application software, which is similar to MMX and 3DNow!, relying on portions of code that can be vectorized.
	www.extremetech.com /article2/0,3973,702573,00.asp (1172 words)

	PCWorld.com - Intel Brings Hyperthreading to Notebooks (Site not responding. Last check: 2007-10-26)
		Hyperthreading allows a multithreaded operating system or application to take advantage of unused execution units in a single-threaded processor.
		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.
	www.pcworld.com /news/article/0,aid,112606,00.asp (394 words)

	Intel claims hyperthreading produces 900%+ boost (Site not responding. Last check: 2007-10-26)
		But if the two games were coded to hyperthread, (which is very similar to coding for dual processor motherboards) and were running on a hyperthreaded platform, it's entirely possible that you'd actually be able to play them both at the same time.
		Currently, hyperthreading is too expensive for the desktop market but, over the next few years, expect to see two-way and four-way servers replaced with hyperthread processors which, is actually cheaper than the currently situation.
		Intel is presenting the hyperthreading claim in such a way as to make it seem that a 900 - 1000% increase is a common real-world benefit of hyperthreading.
	www.freerepublic.com /focus/news/801828/posts (3478 words)

	Hyper-Threading Performance Analysis
		Currently hyperthreading hasn't made it's way to the desktop Pentium IV processors (it's coming) and we haven't seen uniprocessor socket 603 boards to this point.
		To examine the performance impacts that hyperthreading has on our suite of benchmarks I enlisted Hooz to assist me in collecting the necessary data.
		Hyperthreading enabled is the order of the day with Sandra, it seems.
	www.2cpu.com /articles/43_1.html (476 words)

	CGTalk - Do AMD64 (s939) have some sort of HyperThreading?
		Or is Hyperthreading some sort of super-patented thing by intel in a way that AMD can't implement it (even if they make a few changes).
		hyperthreading is a technology my intel, simulating a dual CPU performance with one CPU.
		I remember finding somewhere, also on ars I believe, something mentioning that HyperThreading isn't exactly new either :P Granted the P4 was the first to bring it to the desktop.
	forums.cgsociety.org /printthread.php?t=205568 (608 words)

	[H]ard\|Forum - AMD HyperThreading? (Site not responding. Last check: 2007-10-26)
		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.
		HyperThreading is of course dealing with asyncronous multitasking or some highbrow Intel BS.
		hyperthreading minimizes the time lost when you have empty spots in the pipeline, from branch mis-predictions.
	www.hardforum.com /printthread.php?t=809776 (1021 words)

	PCWorld.com - Two CPUs in One?
		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.
		Nevertheless, hyperthreading remains a very new technology, and Intel anticipates further performance improvements as applications are modified to take better advantage of it.
		The key to taking advantage of hyperthreading is not merely to run multiple programs or a multithreaded application; it is to make sure that those programs hammer the processor with tasks, says Dean McCarron, a principal analyst at Mercury Research.
	www.pcworld.com /news/article/0,aid,107492,00.asp (1530 words)

	Intel Hyperthreading = Hyper pooness - Dev Hardware
		My understandign is that the Hyperthreading is better for multi-tasking and resource hogs like vid-editing, whereas the AMD is better for...
		The fact that a computer with hyperthreading enabled runs benchmarks slower is a well known fact.
		Hyperthreading does have it's uses for the applications that can use it.
	www.devhardware.com /forums/intel-processors-30/intel-hyperthreading-hyper-pooness-22779.html (1603 words)

	My-ESM - Intel Xeon processors already employ Hyperthreading (Site not responding. Last check: 2007-10-26)
		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.
		The spokesman said Hyperthreading doesn't double the power of the processor, but has achieved more than a 30% increase in performance and throughput over a conventional single processor.
	www.my-esm.com /digest/story/OEG20010829S0079 (625 words)

	[No title]
		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.
		Sure, hyperthreading improves execution efficiency, or "throughput," by (ideally) keeping the processor's pipeline filled with instructions from multiple threads, but where it really shines is in situations where one thread is stalled and the other is still moving.
		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.
	arstechnica.com /articles/paedia/cpu/prescott.ars/1 (706 words)

	Wireless: NewsFactor Network - - What Hyperthreading Can (and Can't) Do for You (Site not responding. Last check: 2007-10-26)
		With hyperthreading, a single processor can handle those multiple streams, or threads, as if it were two processors.
		Hyperthreading is also best disabled if a user is running a heavy-duty floating-point application, Kleynhans noted.
		What hyperthreading does signify is the enhanced creativity microprocessor designers can exploit when they have more transistors to work with, he added.
	www.wirelessnewsfactor.com /perl/story/21119.html (1491 words)

	Beyond3D - Which was nice. (Site not responding. Last check: 2007-10-26)
		With a HyperThreaded CPU there are two Architectural State engines controlling what is being executed on the CPU, by which the state of two applications or threads are controlled.
		The theory is that the two tasks are controlled effectively enough so that the 'gaps' in processing that normally occur in a single threaded CPU are 'filled' with processes from the other thread with as little contention between the two as possible.
		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.
	www.beyond3d.com /reviews/intel/p4306/index.php?p=2 (552 words)

	Study: Intel's hyperthreading could expose servers - Computerworld
		Intel Corp.'s hyperthreading technology could allow a hacker to steal security keys from a compromised server using a sophisticated timing attack, a researcher said Friday in a paper presented at the BSDCan 2005 conference.
		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.
		Hyperthreading processors also ship on desktop PCs, but this particular flaw is a problem only for servers, Percival said on his Web site.
	computerworld.com /securitytopics/security/story/0,10801,101769,00.html (1306 words)

	Hyperthreading - Hype? (Site not responding. Last check: 2007-10-26)
		I believe the reason is that Photoshop is one of the few programs-at present-that Hyperthreading has been optimized for.
		Most of the info I've seen suggests that you should expect anywhere from a slight to moderate performance boost for PS from hyperthreading; if you're expecting a huge jump, you'll be disappointed.
		Hyperthreading is a fair amount of hype as far as I'm concerned being I've tested Photoshop on multi processor Xeon servers with HT enabled and disabled.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=005YRv (2457 words)

	AnandTech - Hyperthreading help (Site not responding. Last check: 2007-10-26)
		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.
		And to answer Blain, yes I did say I know that hyperthreading is enabled in the BIOS, and that article is one I had looked at, although I am not yet ready to begin overclocking, I just want to make sure the CPU and MB are working correctly first.
		You said it didn't show 2 proccessors in device manager, you didn't specify that it said standard PC, either hyperthreading was not enabled when you installed windows, or it's not working properly and a bios update may be neccessary.
	forums.anandtech.com /messageview.cfm?catid=28&threadid=1690915 (848 words)

	Workstation makers switch off Intel tool \| Tech News on ZDNet (Site not responding. Last check: 2007-10-26)
		Although the situation will change, the wrinkle in the workstation market--where Intel said users could see performance benefits of up to 30 percent on select applications--underscores the difficulties in gaining broad acceptance and use for a new technology.
		Hyperthreading, announced in August 2001, is Intel's take on simultaneous multithreading, a microprocessor design concept that essentially makes a chip behave more efficiently.
		When the technology was announced, Intel said that a workstation with hyperthreaded Xeon chips running Alias-Wavefront, a graphics application, achieved a 30 percent improvement in tests.
	news.zdnet.com /2100-9584_22-963942.html (862 words)

	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.
		The Linux hyperthreading patch was written by Intel, so I'd guess it's pretty official.
	www.geek.com /news/geeknews/2001dec/bch20011210009227.htm (642 words)

	NewsFactor Network - - A Linux Mystery: Configuring for Virtual Processors
		Hyperthreading support was built into the Linux 2.4 and 2.5 code bases, but some experts note there are still some hitches that could warrant turning the feature off.
		Because hyperthreading in effect adds another logical CPU that shares the same resources with the physical CPU, the performance benefit is not 100 percent.
		But with hyperthreading, the applications may be placed on two hyperthreads of the same physical CPU, leaving one CPU idle.
	newsfactor.com /perl/story/21871.html (1405 words)

	[No title] (Site not responding. Last check: 2007-10-26)
		Memory performance decreases with dual processors regardless of whether hyperthreading is enabled or not.
		You'll see that hyperthreading is most beneficial on floating point math.
		I first did this one normalized as well, however the results were misleading so I changed the graph to show absolute numbers.
	home.insightbb.com /~george/Hyperthreading/Hyperthreading.html (315 words)

	Ace's Hardware
		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 concept of the trace cache makes it much harder to calculate the number of sustained x86 instructions, but it is clear that the Pentium 4 is not running at its full potential either.
		The idea is to execute two threads, or "tasks," at the same time on the same processor (read more about threads and processes here).
	www.aceshardware.com /read.jsp?id=50000319 (1180 words)

	Intel: Hyperthreading to speed desktops \| CNET News.com
		Hyperthreading will appear in the 3GHz Pentium 4 for desktops, due later in the quarter.
		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.
		It's a free performance boost, he added, because the circuitry to enable hyperthreading is already inside the Pentium 4.
	news.com.com /2100-1001-957194.html (1364 words)

	Forums - HyperThreading Question
		Is it possible that hyperthreading reduces the amount of CPU that can be allocated to the primary process that I run, and that disabling the hyperthread could actually improve my performance?
		With the dual machine hyperthreaded, it would appear that the single process would only be able to max out one of the four indicated CPU's, or only half of CPU time of one of the two real CPU's...
		The sad thing is that my workstation is a dual processor machine, and apparently the hyperthreading is not an option to disable in the bios.
	www.elitetrader.com /vb/printthread.php?threadid=50457 (1754 words)

	Geek.com Geek News - HyperThreading implementation in Windows XP (Site not responding. Last check: 2007-10-26)
		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.
		So I did a complete OS reinstall with Hyperthreading disabled and then turned it back on after everything was installed.
		On my laptop however (HP z7140US) there is no option to disable the Hyperthreading, same problem as mentioned by a couple of other people on this board.
	www.geek.com /news/geeknews/2002jan/bch20020110009694.htm (4579 words)

	Mindful Musings » Enable Hyperthreading after upgrading motherboard
		I installed a new mobo and P4 with hyperthreading on 10/17, and if it wasnt for your article, I would never have known that hyperthreading was not automatically enabled in XP.
		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’ve been trying to get hyperthreading back for a year and this is the first method that has worked.
	mindfulmusings.net /weblog/2004/10/16/enable-hyperthreading-after-upgrading-motherboard (1912 words)

	hyperthreading - Got \| Apex? Forums
		In addition, the motherboard chipset and BIOS have to support HT, which I believe is currently limited to the i845PE or Granite Bay chipsets (I know that the i845E chipset won't work).
		Hyperthreading basically treats one physical processor as two chips -- in other words, it functions fairly similar to a dual-CPU setup (Symmetric MultiProcessing -- SMP).
		If you have a dual hyperthread system, the OS will see 4 processors.
	www.gotapex.com /forums/showthread.php?t=56915 (507 words)

	OpenMP and P4 hyperthreading
		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.
		The results can be viewed at : http://computational-battery.org/ I have received a lot of comments about the hyperthreading due to my former posting, but little actual benchmark results.
		It would be interesting to see if there are other programs or problems that can benefit from the hyperthreading.
	www.beowulf.org /pipermail/beowulf/2002-April/006951.html (319 words)

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