Dual-core support is at operating sys level, application should not know it at all. But for database complex query, sometimes you have to shut off multi-core option in order to run query without headlock, which is mostly occured on SQL Server. -nicetomeetyou(牛哥) @芝加哥华人论坛:芝加哥枫下论坛 The Rolia Forum of Chicago

工作学习 / 专业技术讨论 / 现在新推出的dual-CPU computer，用什么软件可以真正的用到双CPU？ -nicetomeetyou(牛哥); 2007-5-14 (#3674375@0)

Two comments: (1) Dual-core is two core within a single CPU-not two CPU; (2) It's up to OS rather than app's duty to make the full use of dual-core CPU so theoretically all software can be benefit from the CPU. -renjl0810(不是一般的笨); 2007-5-14 (#3674556@0)

You are right. So the two CPU sharing the same memory, or they have separate memory? Anyone knows whether current windows system has already supported this dual-core mode or not? I haven't googled it yet. -nicetomeetyou(牛哥); 2007-5-14 (#3674581@0)

lol, u really high-level dummy! -001isbetter(001-is-better); 2007-5-14 (#3674590@0)

历史证明，给非计算机专业人员破处答疑是很累人的。+ -duoshaosuanshao(不多也); 2007-5-14 (#3674597@0)

u r wrong! the new dual cpu can share human's memory! -akoei(停车**枫林晚); 2007-5-14 (#3674681@0)
LOL! "破处" -arfeifei(老顽童); 2007-5-15 (#3676528@0)

我的Laptop是Dual Core的Dell M90，内存2G，但是内置操作系统是Windows XP Professional。上面有个标签说是Windows Vista Capable。Dual Core的系统应该是可以运行目前流行的Windows XP。内存结构应该是和原来一样，只是现在新计算机，内存一般是1G以上。 -davidg(David); 2007-5-14 (#3674614@0)

I wrote c code for Cray before using their Multiple Process Interface. I found if the target is shared memory dual-core, it has higher potential to make code dead-lock. dual-code with separate memory is faster, but cost more. -nicetomeetyou(牛哥); 2007-5-14 (#3674947@0)

dual-core=dual-code=memory-share. I believe your memory does not just limit to these, you have more potential and brighter future! -001isbetter(001-is-better); 2007-5-14 (#3675008@0)

发觉你在rolia课堂上经常不注意听讲，走神，问东答西。不是一个可靠的teammate，not to say team lead. 友情提醒：我不是个善主，专业讨论时请认真一些。：-） -nicetomeetyou(牛哥); 2007-5-14 (#3675106@0)

seems you know the word Cray, then do you know the difference between NUMA and SMP? if not, you can cut ur #2 now. -001isbetter(001-is-better); 2007-5-14 (#3675592@0)

I worked three years in a university research group offering high performance computing test for Cray and IBM when I was in the US. -nicetomeetyou(牛哥); 2007-5-14 (#3676099@0)

so what? you're goldplated? then what? 7! -001isbetter(001-is-better); 2007-5-14 (#3676129@0)

Haha, that means I am 001. :-) You know it by using a good ID. -nicetomeetyou(牛哥); 2007-5-14 (#3676145@0)

∷∷∷． -001isbetter(001-is-better); 2007-5-15 (#3678221@0)

True...when I was doing coding with C, my boss always said C is strong enough and no bug at all. After I moved, he always compalined C became bug maker...Actually good to know you are not acting coder any more. -judy_an(绿腰); 2007-5-14 (#3675143@0)

C is the most flexible lang because of pointer, it is very close to assembly lang, which is based on hardware, but it brings lots of bugs for sure. If you write driver code, C is the most efficient option to choose. Sys Eng uses C lots more than App Eng. -nicetomeetyou(牛哥); 2007-5-14 (#3675177@0)

well said. if you understood C pointers in that level, you could make drive/ apps code strong enough to use dual-cpu or dual-core CPU instead of using microsoft standard system call.:-) -judy_an(绿腰); 2007-5-14 (#3675196@0)

If you call Win API, you are actually doing application dev. The vendors of the CPU offer low level C API library which handles those headache multi-thread-multi-processor things. For some challenging applications, they still use single CPU for safe. -nicetomeetyou(牛哥); 2007-5-14 (#3675250@0)

Well. seem you do understand everything. buy something fits is always No.1 shopping policy. Then.. you just want ppl here waste time to raise your post up? Anyway, I did. -judy_an(绿腰); 2007-5-14 (#3675269@0)

It is so annoying some ppl don't try to answer question, but repeatedly prefer to abuse requester's credibility, which is very ugly manner on this forum. Thanks! -nicetomeetyou(牛哥); 2007-5-14 (#3675275@0)

... -judy_an(绿腰); 2007-5-14 {357} (#3674818@0)
1.For thoes people doing video editing, multi-threaded applications and some multitasking ..2.Windows operating system called the 'scheduler' will manage and assign CPU to what program to be running at any given time.3. However, if you are running a single program and it is not "multi-threaded", there won't a benefit from more than one CPU or core.

I know what you said, but the so-called "multi-threads" does not mean the schduler has the knowledge or ability to assign different threads to different CPUs. It may just put them into queue and arrange their execution based on priority management. -nicetomeetyou(牛哥); 2007-5-14 (#3674893@0)

Certainly, if your application have nothing to do...no need dual-core or dual-CPU -judy_an(绿腰); 2007-5-14 (#3675152@0)

Dual-core support is at operating sys level, application should not know it at all. But for database complex query, sometimes you have to shut off multi-core option in order to run query without headlock, which is mostly occured on SQL Server. -nicetomeetyou(牛哥); 2007-5-14 (#3675192@0)

我相信你是马呐籍了，也明白it业为什么这么不景气了。呵呵 -baalinca(scarb); 2007-5-14 (#3674891@0)
HT. -frankwoo(柳五随风); 2007-5-15 (#3677865@0)
As I mentioned above, it's SINGLE CPU with two core rather than TWO CPU so obviously the two cores will be sharing the same set of MAIN memory but having separate cache. -renjl0810(不是一般的笨); 2007-5-15 {383} (#3678145@0)
Personally I don' t think it makes too much sense fro home/office purpose. Even large commercial software package won't benefit from the dual-core too much simply 'coz the performance of hard drive is the bottle neck rather than CPU. So I would say the only beneficary of this kind of CPU would be those computation-intensive programs but not too much data to read from hard drive

Microsoft admitted that "Game performance may be poor on a Windows XP-based computer that is using a dual-core processor". Most games are written without multiple-CPU in mind. Also, better download Windows patches for your dual-code PC. See link. -nicetomeetyou(牛哥); 2007-5-14 (#3674966@0)

dual-core or dual-code, that's a question. What a manager's mind is? dummy! -001isbetter(001-is-better); 2007-5-14 (#3675001@0)

你们这些人啊，开会一言不发，会后搞小动作，难成大气。I HAVE SOLID EE & COMS BACKGROUND. -nicetomeetyou(牛哥); 2007-5-14 (#3675015@0)

我一直以为您是IT背景的! ：） -platypus(五月的巴赫); 2007-5-14 (#3675031@0)

我还老当coder啊！！！ -nicetomeetyou(牛哥); 2007-5-14 (#3675046@0)

001isbetter, duoshaosuanshao, ice, 牛哥给你们上上课：Dual CPU Core has two CPU Cores, they have their own L1 Caches, and both share Bus Interface and L2 Caches. Do I need to tell you that the so-called Cache is Memory? -nicetomeetyou(牛哥); 2007-5-14 (#3675040@0)

well, I only know either "dual CPU" or "dual core". Never heard so-call "Dual CPU Core ",so confused. -judy_an(绿腰); 2007-5-14 (#3675166@0)
不带这么玩儿的啊，先问个低级问题，貌似求教，然后在别人给出想法之后，遍搜网络再教育别人一翻。xb也要给别人留面子阿。 -flyingegg(O'`); 2007-5-14 (#3675175@0)

我问的问题确实是我想知道的，因为没有人能确切地告诉你，这个app绝对用上了dual-core。但当你购买PC时，他们拼命推销这个新概念，仿佛你若不买，就不合时尚了。 -nicetomeetyou(牛哥); 2007-5-14 (#3675202@0)

.if I were a manager, I would think how to improve the apps performance instead of complaining sales. I am assuming that 's why you post this question. -judy_an(绿腰); 2007-5-14 (#3675226@0)
Just some kind of IT buzzar word so simply leave it unless you wanna spend every penny within your budget for your company or xb for urself. In my case, Eclipse takes such a looooong time to start but if I disabled McAfee ...啊,整个世界都清静了 -renjl0810(不是一般的笨); 2007-5-15 (#3678170@0)

You can stop McAfee scanning certain types of files, for example, .jar. it is useless to scan those java files. If you totally shut down McAfee, I would be sad for your IT manager. Security policy becomes a void. -nicetomeetyou(牛哥); 2007-5-15 (#3678265@0)

It is so annoying some ppl don't try to answer question, but repeatedly prefer to abuse requester's credibility, which is very ugly manner on this forum. -nicetomeetyou(牛哥); 2007-5-14 (#3675279@0)

不要这样嘛，年纪一大把了，问题还这么天真？就象问女孩哪种牌子的化妆品好一样初级。 -886xyz(静以修身); 2007-5-14 (#3676203@0)
id组合就是这样相生相克的啦,大家都忍了,你也忍忍吧. -flyingegg(O'`); 2007-5-15 (#3676347@0)

dual-CPU computer 或 Multi cpu，那是多年前就有的技术。why did you say "现在新推出的"? -jackpot(Jackpot); 2007-5-15 (#3676353@0)

我指的是家用PC. -nicetomeetyou(牛哥); 2007-5-15 (#3677004@0)

那天在公司没法输入中文所以写英文,看来是我的英语太烂了别人看不懂:-(. 简单说,Dual-Core CPU is not Dual CPU. more detail inside... -renjl0810(不是一般的笨); 2007-5-15 {1009} (#3678090@0)
Dual-Core中文叫双核,也就是具有两个内核的单CPU.当然,AMD & Intel都在研制4内核设置更多内核的CPU.但无论怎么样,始终都是单CPU. So if you were talking about desktop PC then I'm 100% sure it falls into this category and from end user's perspective we don't need to worry about it's dual-core or not - it's up to OS's responsibility to make the best use of CPU. Otherwise, if you were talking about server or multi-processor system, it's such a big topic that the only word I can say is yes, it could be categorized as shared memory, non-shared memory, shared disk; SMP versus ??? (sorry, I cannot remember). If this was the case, sometimes paralell programming is needed but more importantly, dedicated OS is must. As for C programming language, my comment would be, the tool is just as good as the person who use it... For me, I used to write a virus which rebooted my PC from time to time but actually I was hoping to develop a command parser at the very begining of my IT life (not career) - really a shame!

我应该说抱歉，我用错了term,精确的说法是dual core processor. It is two processor cores on one die。说双CPU是不精确的。 -nicetomeetyou(牛哥); 2007-5-15 {544} (#3678334@0)
The benefit will come for users who multitask. As in a dual processor system there is a second processor core to share the load either in balanced form or by itself. Programs, such as Adobe Photoshop, are SMP aware and are much faster on a dual processor system。There is some load balancing of non-SMP applications but not as efficiently as those written for multithreading.

Generally speaking, running programs on dual-core home PC would be faster than single-core home PC. I am just curious: Is there any reliable benchmark test results?

这一贴精确，比(#3675192@0)精确多了。你如果要比较同一程序在多核和单核下performance差别，先在正常情况下测试，然后运行测试程序，在测试之前，在task manager里面选中它，左键，菜单里选set affinity设定它只在某一个core上运行，得出结果跟上一个比较。 -baalinca(scarb); 2007-5-15 (#3678436@0)

@Chicago

Dual-core support is at operating sys level, application should not know it at all. But for database complex query, sometimes you have to shut off multi-core option in order to run query without headlock, which is mostly occured on SQL Server.

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