a****a
发帖数: 5763 | 1 【 以下文字转载自 Physics 讨论区 】
发信人: acidia (acidia), 信区: Physics
标 题: BREAKING NEWS: Error Undoes Faster-Than-Light Neutrino Resu
发信站: BBS 未名空间站 (Wed Feb 22 21:17:31 2012, 美东)
http://news.sciencemag.org/scienceinsider/2012/02/breaking-news
t appears that the faster-than-light neutrino results, announced last
September by the OPERA collaboration in Italy, was due to a mistake after
all. A bad connection between a GPS unit and a computer may be to blame.
Physicists had detected neutrinos travelling from... 阅读全帖 |
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c****t
发帖数: 19049 | 2 It appears that the faster-than-light neutrino results, announced last
September by the OPERA collaboration in Italy, was due to a mistake after
all. A bad connection between a GPS unit and a computer may be to blame.
Physicists had detected neutrinos travelling from the CERN laboratory in
Geneva to the Gran Sasso laboratory near L'Aquila that appeared to make the
trip in about 60 nanoseconds less than light speed. Many other physicists
suspected that the result was due to some kind of error, gi... 阅读全帖 |
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a****a
发帖数: 5763 | 3 http://news.sciencemag.org/scienceinsider/2012/02/breaking-news
t appears that the faster-than-light neutrino results, announced last
September by the OPERA collaboration in Italy, was due to a mistake after
all. A bad connection between a GPS unit and a computer may be to blame.
Physicists had detected neutrinos travelling from the CERN laboratory in
Geneva to the Gran Sasso laboratory near L'Aquila that appeared to make the
trip in about 60 nanoseconds less than light speed. Many other physici... 阅读全帖 |
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f***y
发帖数: 4447 | 4 http://news.sina.com.cn/o/2017-11-10/doc-ifynrsrf3416067.shtml
11月10日，美国Science杂志以First Release的形式发表了西安交通大学与上海微系统
与信息技术研究所的合作论文——Reducing the stochasticity of crystal
nucleation to enable sub-nanosecond memory writing（降低晶体成核随机性以实现
亚纳秒数据存储），该工作从接收到在线发表仅10天。
处于数字全球化的今天，爆炸式增长的信息对数据的存储与传输提出了极大的挑战，而
且目前商用计算体系架构内各存储部件，即缓存（SRAM）、内存（DRAM）和闪存（NAND
Flash）之间性能差距日益加大，其间的数据交换效率也已成为了电子设备发展的瓶颈
。因此研发具备存储密度大、读写速度快、能耗低、非易失（即断电后数据不丢失）等
特点的新式通用式存储介质势在必行。基于相变材料的相变存储器（PCRAM）是最接近
商业化的通用式存储器，由国际半导体巨头Intel与Mircon联合推出的首款... 阅读全帖 |
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b*****s
发帖数: 11267 | 5 ☆─────────────────────────────────────☆
dengdengdeng (dengdengdeng) 于 (Wed Dec 12 20:59:18 2012, 美东) 提到:
热烈祝贺illinois告别全美唯一没有CCW的州。
没枪的同学们，坏蛋抢你们的时候，你们打算：
A：苦苦哀求，不要伤害你和家人，然后盼望这个坏人是个盗亦有道的人。或者只要钱。
B：脱裤子献菊花。
C：献老婆孩子。
D：献了一切，坏蛋仍然要杀人。
E：拔枪保卫自己和家人。
如果你选择持枪，一定要去受训练，训练非常重要。全家都要接受训练。
安全意识要高。精神状态要稳定，幸福，呵呵。
☆─────────────────────────────────────☆
bamboox (bamboox) 于 (Wed Dec 12 21:16:17 2012, 美东) 提到:
其实就算有CCW也很不方便， 没什么机会带。 公司肯定不可以了， 那平时
上班就带不了。 school 也肯定不可以， 平时接送小孩又不可以带了。
电影院等大众娱乐场所， 多数不给， 那下班后又不... 阅读全帖 |
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c****t
发帖数: 19049 | 6 (Reuters) - Scientists around the world said on Friday the discovery of sub-
atomic particles apparently traveling faster than light could force a major
rethink of theories on the makeup of the cosmos, but the findings would
first have to be independently confirmed.
"Extraordinary claims require extraordinary evidence, and this is an
extraordinary claim," eminent cosmologist and astrophysicist Martin Rees
told Reuters.
The CERN research institute near Geneva said measurements over three years
ha... 阅读全帖 |
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J*******k
发帖数: 3298 | 7 每次看到这几个数字我就觉得英国人还是牛掰: $8B for a particle last less than
a nanosecond
They kept repeating that it was important because it gives matter mass, but
they didn’t say how such an important job can be done by a particle that
needs an $8 billion device to coax it into existence for less than a
nanosecond before it returns to oblivion. |
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T**E
发帖数: 1892 | 8 Neutrino experiment affirms faster-than-light claim - November 18, 2011
An updated version of this story is now available (see 'Neutrino experiment
replicates faster-than-light finding').
It is a remarkable confirmation of a stunning result; but most physicists
remain skeptical. That seems the most probable outcome of a release of new
data expected on 17 November from researchers with the Italian OPERA
collaboration, who say they have confirmed their controversial finding that
flighty subatomic ... 阅读全帖 |
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s**********e
发帖数: 33562 | 9 No, no, no. General Ridgway can beat such a question in 1 nanosecond, using
his so call General-Li-Logic...
that |
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b****r
发帖数: 2555 | 10 ☆─────────────────────────────────────☆
gtc (牛顿的苹果) 于 (Sun Jul 31 11:02:47 2011, 美东) 提到:
我看了，感觉德国纳粹时期高层决策还是很开明的，下级经常顶撞希特勒，而希特勒的
独裁也并不是权利无限大，他的统治真的是靠德国人的支持。希特勒也是很文明一人，
不会像同时期以及后来有些其他国家的独裁者，权利无边啊。
大家说说。
☆─────────────────────────────────────☆
dancooper (诚能见可欲而思谦冲以自牧) 于 (Mon Aug 1 02:26:05 2011, 美东) 提到:
没看过。
元首也不是一开始就是元首，也有些人跟他竞争，比如那个后来架飞机跑道英国的(名
字忘了),也是建党元老，是不愿意对英开战的。还有那个罗姆，冲锋队的头头。成为说
一不二的元首，那是在清洗了竞争者之后的事情。所以独裁存在内在的自我毁灭因素，
难以长久。
☆─────────────────────────────────────☆
dhzdhz (敦厚之大胡子教... 阅读全帖 |
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a***y
发帖数: 19743 | 11 【 以下文字转载自 Physics 讨论区 】
发信人: aaaty (阿fan提), 信区: Physics
标 题: 狭义相对论可能被推翻
发信站: BBS 未名空间站 (Thu Sep 22 16:20:15 2011, 美东)
http://www.reuters.com/article/2011/09/22/science-light-idUSL5E
Particles recorded moving faster than light - CERN
(Reuters) - An international team of scientists has recorded neutrino
particles travelling faster than the speed of light, a spokesman for the
researchers said on Thursday -- in what could be a challenge to one of the
fundamental rules of physics.
Antonio Ereditato,... 阅读全帖 |
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R****a
发帖数: 6858 | 12 All Comments (29)
tygoo7 5 days ago
im concerened
Reply ·in reply to aaron martinez(Show the comment)
TheC4fire 5 days ago
i would like to say that we in the US have no ground to oppose the
construction of carriers by the Chinese Gov. Also they have the right
; to national defense just as much as we do. And BTW obi2012 we have 19.
Reply ·
obi2012 6 days ago
Chill, they have as many as the French and Russians, we have like
what, 10? And that isn't even counting amphibious ... 阅读全帖 |
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m**********e
发帖数: 12525 | 13 提醒你下基本常识:
GPS授时精度是+/- 20 nanosecond
也就是+/- 20 ppb的精度
卫星上的铯钟就冰棍那么大,有ppb的精度已经谢天谢地了
65533;
�� |
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b**********s
发帖数: 9531 | 14 Stop Talking! Lets try some real fixes, 20 points that address the concerns
of most Americans They are suggested solutions that are (numbered) please
reply with the points that you like and the ones that you don’t with your
reasoning.
1) End Corporate Personhood (Keep Human Rights OUR Rights)
2) Reverse Citizens United (Corporate Money is Not Free Speech)
3) Prohibit All Former and Future Congressmen or Staff from being a Paid
Lobbyist.(Get Out of Washington)
4) Prohibit Any Lobbyist from offeri... 阅读全帖 |
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l****z
发帖数: 29846 | 15 Strassel: Democrats Run for ObamaCare Cover
After weeks of vowing they wouldn't cave on the president's signature
legislation, some Democrats are doing just that.
By
KIMBERLEY A. STRASSEL
Jeanne Shaheen doesn't sound like a Democrat who just won a government-
shutdown "victory." Ms. Shaheen sounds like a Democrat who thinks she's
going to lose her job.
The New Hampshire senator fundamentally altered the health-care fight on
Tuesday with a letter to the White House demanding it both exten... 阅读全帖 |
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h*******n
发帖数: 8906 | 16 When I got to the State Department, it was still against the rules to let
most -- or let all Foreign Service Officers have access to a Blackberry.
“We Couldn't Take Our Computers, We Couldn't Take Our Personal Devices”
Off The Plane In China And Russia. *“I mean, probably the most frustrating
part of this whole debate are countries acting like we're the only people in
the world trying to figure out what's going on. I mean, every time I went
to countries like China or Russia, I mean, we couldn't ... 阅读全帖 |
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G***E
发帖数: 392 | 17 Amazon, Woot, and You: But Mostly Woot
News by Woot! on June 30, 2010 at 3:30 PM
To be uncharacteristically serious for half a nanosecond, yes, Woot has
signed an agreement to be acquired by Amazon. It shouldn't change anything
much for us or you after the deal closes, we just figured you’d like to
know a few details. You see, when two companies meet over drinks and some
light jazz and decide they'd like to get to know each other better… You
know what? Our CEO said it best in his letter to us em |
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b**********x
发帖数: 844 | 18 没有吃到包子的没有关系，事情处理完我还有888个和谐包
70571 blackhorsezx Dec 4 ● [发888个包子] trueme事件 证据 + 解决方案
成功奖励 10 伪币的用户: bingchuan, DrillBaby, tonyparker, tommydidi1, MrDeal
, busby, kanbbs, isis1414, nancylem, whatso, Uruguay, parkjisung,
rainrainrain, circuitry, alpenglow, yung, cartman2005, bybis, gluying,
firstsnow, wenfeng, winline, ctmcmx, cmuwx, NONB, adameven, loojiannan,
chaselife, feyisgod, mtgobest, zongxiaoyu, xinyu051219, kaylaxu, ck01320,
xybsh, antholy, dadandan, urwumeifen, pzhang2000, H7, iNovel,... 阅读全帖 |
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g********d
发帖数: 19244 | 19 好 已吃到
没有吃到包子的没有关系，事情处理完我还有888个和谐包
70571 blackhorsezx Dec 4 ● [发888个包子] trueme事件 证据 + 解决方案
成功奖励 10 伪币的用户: bingchuan, DrillBaby, tonyparker, tommydidi1, MrDeal
, busby, kanbbs, isis1414, nancylem, whatso, Uruguay, parkjisung,
rainrainrain, circuitry, alpenglow, yung, cartman2005, bybis, gluying,
firstsnow, wenfeng, winline, ctmcmx, cmuwx, NONB, adameven, loojiannan,
chaselife, feyisgod, mtgobest, zongxiaoyu, xinyu051219, kaylaxu, ck01320,
xybsh, antholy, dadandan, urwumeifen, pzhang2000, H7, ... 阅读全帖 |
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f********y
发帖数: 20 | 20 下面这些文章都是仇旻（2011年已经号称全职回浙大，但是瑞典的组这两年仍然继续招
收硕士博士生）,领导的瑞典课题组的2013-2014年度部分文章，即拿大千人，又以瑞典
国籍(仇旻本人已放弃中国国籍）拿到中国的杰青，是不是有点明目张胆了。。。
All-optical switching of silicon disk resonator based on photothermal effect
in metal-insulator-metal absorber
Thermal radiation dynamics in two parallel plates: The role of near field
Ultra-narrow-band light dissipation by a stack of lamellar silver and
alumina
Whispering gallery mode nanodisk resonator based on layered metal-dielectric
waveguide
Lithography-free broadband v... 阅读全帖 |
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o**y
发帖数: 3065 | 21 有人“不小心”按错一个字母，造成trigger一大堆margin call，引发滚雪球效应。。同时这个“粗心”的家伙事先就用复杂的数学模型算好了dip的深度，到最低的点时，自动trigger他家的一大堆order来收便宜货，于是即引发大盘瞬间又rebound回来。
某人要有这个能力，一定的是资金极其充沛，并且调动起来十分隐蔽，同时电脑系统极端强大，nanosecond trading必不可少。。 具有此能力的不外乎就是高盛之流了。
另外，为什么高盛偏偏选择今天这么大手笔，堪称历史罕见。原因就是欧洲，中国，加上高盛自己的负面消息造成大家都市场的心态变成了极度的risk aversion。选在公布就业数据的前一天，更有心理战的技巧，因为在公布数据前大家就都清楚大概会是好数据，所以明天一定会涨，那么今天跌这么，明天有人就会就着好数据大买而造成大涨，高盛手里头的便宜货自然会为他赚得更多。 |
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S*********N
发帖数: 6151 | 22
。同时这个“粗心”的家伙事先就用复杂的数学模型算好了dip的深度，到最低的点时
，自动trigger他家的一大堆order来收便宜货，于是即引发大盘瞬间又rebound回来。
极端强大，nanosecond trading必不可少。。 具有此能力的不外乎就是高盛之流了。
加上高盛自己的负面消息造成大家都市场的心态变成了极度的risk aversion。选在公
布就业数据的前一天，更有心理战的技巧，因为在公布数据前大家就都清楚大概会是好
数据，所以明天一定会涨，那么今天跌这么，明天有人就会就着好数据大买而造成大涨
，高盛手里头的便宜货自然会为他赚得更多。
10 years ago, I already thought about this trick.
And today it is not the first time. stamped. |
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c*******d
发帖数: 1763 | 23 要藐视sec的能力不是这么藐视的吧
。同时这个“粗心”的家伙事先就用复杂的数学模型算好了dip的深度，到最低的点时
，自动trigger他家的一大堆order来收便宜货，于是即引发大盘瞬间又rebound回来。
极端强大，nanosecond trading必不可少。。 具有此能力的不外乎就是高盛之流了。
加上高盛自己的负面消息造成大家都市场的心态变成了极度的risk aversion。选在公
布就业数据的前一天，更有心理战的技巧，因为在公布数据前大家就都清楚大概会是好
数据，所以明天一定会涨，那么今天跌这么，明天有人就会就着好数据大买而造成大涨
，高盛手里头的便宜货自然会为他赚得更多。 |
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c**a
发帖数: 316 | 24 只要是坏事就一定是 GS 做的
其实 DE Shaw， Citadel 他们更坏，
sue GS 就是他们撺掇 SEC 去做的。
GS 其实自己也知道， 买了自己的put。
其实 美国房地产根本没有泡沫， 是奥巴马看到大家都有房子，自己不爽就连个 wall
street 把 房地产搞垮，然后去 FL 买了 N 个 mansion。
。同时这个“粗心”的家伙事先就用复杂的数学模型算好了dip的深度，到最低的点时
，自动trigger他家的一大堆order来收便宜货，于是即引发大盘瞬间又rebound回来。
极端强大，nanosecond trading必不可少。。 具有此能力的不外乎就是高盛之流了。
加上高盛自己的负面消息造成大家都市场的心态变成了极度的risk aversion。选在公
布就业数据的前一天，更有心理战的技巧，因为在公布数据前大家就都清楚大概会是好
数据，所以明天一定会涨 |
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T*U
发帖数: 22634 | 25 小散看牛的全部stop out，钓鱼全买进。
明天涨点，给加仓，MM下周开始磨牛刀。熊也没赚头，vix一下奔40，要买高价粮票。
。同时这
个“粗心”的家伙事先就用复杂的数学模型算好了dip的深度，到最低的点时，自动
trigger他家的一大
堆order来收便宜货，于是即引发大盘瞬间又rebound回来。
极端强大，
nanosecond trading必不可少。。 具有此能力的不外乎就是高盛之流了。
加上高盛自己的
负面消息造成大家都市场的心态变成了极度的risk aversion。选在公布就业数据的前
一天，更有心
理战的技巧，因为在公布数据前大家就都清楚大概会是好数据，所以明天一定会涨，那
么今天跌这么，
明天有人就会就着好数据大买而造成大涨，高盛手里头的便宜货自然会为他赚得更多。 |
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A*X
发帖数: 908 | 26 应该查查future的对赌情况，一般这种大涨大跌，都不是在股票身上赚钱，而是在
future上面几十亿上百亿的对赌赚钱的
。同时这个“粗心”的家伙事先就用复杂的数学模型算好了dip的深度，到最低的点时
，自动trigger他家的一大堆order来收便宜货，于是即引发大盘瞬间又rebound回来。
极端强大，nanosecond trading必不可少。。 具有此能力的不外乎就是高盛之流了。
加上高盛自己的负面消息造成大家都市场的心态变成了极度的risk aversion。选在公
布就业数据的前一天，更有心理战的技巧，因为在公布数据前大家就都清楚大概会是好
数据，所以明天一定会涨，那么今天跌这么，明天有人就会就着好数据大买而造成大涨
，高盛手里头的便宜货自然会为他赚得更多。 |
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o**y
发帖数: 3065 | 27 这是某人自编自导自演的一场阴谋
有人“不小心”按错一个字母，造成trigger一大堆margin call，引发滚雪球效应。。
同时这个“粗心”的家伙实现就用复杂的数学模型算好了dip的深度，到最低的点时，
自动trigger他家的一大堆order来收便宜货，于是即引发大盘瞬间又rebound回来。
某人要有这个能力，一定的是资金极其充沛，并且调动起来十分隐蔽，同时电脑系统极
端强大，nanosecond trading必不可少。。 具有此能力的不外乎就是高盛之流了。 |
|
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j****l
发帖数: 1440 | 29 I don't think they need 印钞机 at these days. They just type +100,000,000,
000 in the ECB computer. Then Greece will get money in nanosecond. |
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i*****n
发帖数: 514 | 30 The exciton dynamics in tetracene thin films
Tetracene thin films are investigated by time-resolved photoluminescence on
picosecond to nanosecond time-scales. The picosecond luminescence decay
dynamics is confirmed to be independent of temperature, but the ns timescale
luminescence dynamics is highly temperature dependent. |
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k**L
发帖数: 3630 | 31 really? well when nuclear explosion occurred, you will only have nanosecond
to react. So would you build a nuclear shelter in your backyard? Hey, "goal,
here, is to hope you'd never need to use it in a nuclear war situation." |
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M*******T
发帖数: 492 | 32 How likely will you be involved in nuclear explosion?
How likely will you be involved in a armed robbery?
I hope I won't have to deal with either one, but beting robbed twice already
, I know there is a higher chance of being robbed then exposed to nuclear
explosion.
Again, weight your own options.
nanosecond
goal, |
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a*o
发帖数: 25262 | 33 CNN 刚发表这文章， very interesting..中文没找到。
http://www.cnn.com/2014/03/26/health/brain-moral-judgments/inde
How your brain makes moral judgments
By Elizabeth Landau, CNN
This image shows differences in brain activity between people who judge an
act wrong and others who say it's not wrong.
(CNN) -- Imagine a CEO wants to profit from a venture that, by the way,
involves emitting pollution toxic to the environment, but she doesn't care
because the goal is profit.
Is the CEO intentionally harming the envir... 阅读全帖 |
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H******7
发帖数: 34403 | 35 The science world was left in shock when workers at the world's largest
physics lab announced they had recorded subatomic particles travelling
faster than the speed of light – a feat that Einstein said was impossible.
If the findings are proven to be accurate, they would overturn one of the
pillars of the Standard Model of physics, which explains the way the
universe and everything within it works.
Einstein's theory of special relativity, proposed in 1905, states that
nothing in the universe can... 阅读全帖 |
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c*******7
发帖数: 17225 | 36 September 23, 2011 10:32 AM PrintText
Faster than light measurement shocks physicists
5 Comments
Have Your Say Email Story
Send to a FriendShare ThisTell Your FriendsTweet ThisTweet ThisMoreShare It.
Del.icio.usFacebookStumbleuponNewsvineYahoo bookmarksMixxDiggRedditGoogle
BookmarksTwitterLinkedInPlay CBS News Video
(AP) GENEVA - Physicists on the team that measured particles traveling
faster than light said Friday they were as surprised as their skeptics about
the results, which appear to viol... 阅读全帖 |
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d********f
发帖数: 43471 | 37 Einstein's Relativity and Everyday Life
By Clifford M. Will
Earth viewed from space
What good is fundamental physics to the person on the street?
This is the perennial question posed to physicists by their non-science
friends, by students in the humanities and social sciences, and by
politicians looking to justify spending tax dollars on basic science. One of
the problems is that it is hard to predict definitely what the payback of
basic physics will be, though few dispute that physics is someho... 阅读全帖 |
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p*******o
发帖数: 6791 | 38 地球火星之间的平均距离光速也12分钟呢。现在雷达, GPS之类的测量时间差，精度轻
松到nanosecond级别吧。12分钟的差别已经非常大了。而且观察点也不只2个，多处观
察，做multilateration，观测点越多越精确。 |
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B********e
发帖数: 19317 | 39 【 以下文字转载自 Joke 讨论区 】
发信人: Huan2007 (胡绵涛), 信区: Joke
标 题: Re: 收音机正在说老爱错了，超光速可行
发信站: BBS 未名空间站 (Thu Sep 22 18:23:40 2011, 美东)
The science world was left in shock when workers at the world's largest
physics lab announced they had recorded subatomic particles travelling
faster than the speed of light – a feat that Einstein said was impossible.
If the findings are proven to be accurate, they would overturn one of the
pillars of the Standard Model of physics, which explains the way the
universe and ev... 阅读全帖 |
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v*****s
发帖数: 20290 | 40 'We have broken speed of light' 22 Sep 2011
Antonio Ereditato, spokesman for the researchers, said: "We have high
confidence in our results. We have checked and rechecked for anything that
could have distorted our measurements but we found nothing.
"We now want colleagues to check them independently."
A total of 15,000 beams of neutrinos were fired over a period of 3 years
from CERN towards Gran Sassoin Italy, 730km (500 miles) away, where they
were picked up by giant detectors.
Light would hav... 阅读全帖 |
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v*****s
发帖数: 20290 | 41 【 以下文字转载自 Joke 讨论区 】
发信人: Huan2007 (胡绵涛), 信区: Joke
标 题: Re: 收音机正在说老爱错了，超光速可行
发信站: BBS 未名空间站 (Thu Sep 22 18:23:40 2011, 美东)
The science world was left in shock when workers at the world's largest
physics lab announced they had recorded subatomic particles travelling
faster than the speed of light – a feat that Einstein said was impossible.
If the findings are proven to be accurate, they would overturn one of the
pillars of the Standard Model of physics, which explains the way the
universe and ev... 阅读全帖 |
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j****u
发帖数: 1413 | 42 李巨：徜徉在量子材料世界
新闻原文与照片请见：http://www.ustcif.org/default.php/content/1464/
2012年10月10日，麻省理工学院（以下简称MIT）以其官方网站首页封面图片方式报道
中国科大90级少年班校友李巨教授的成就。 当地时间11日，中国科大校友新创基金会
致电李巨教授表示祝贺。李巨教授提及已得知“再战北马，捐赠海外交流”行动，“一
定要支持”。随即李巨教授立即在中国科大捐赠网（GIVING.USTC.EDU.CN）捐赠感谢母
校的教育。他还祝福母校“ I wish USTC great success in the campaign.”。
图为2012年10月10日，MIT网站首页今日聚焦以全页封面报道方式介绍李巨。
《徜徉在量子材料世界》介绍了李巨教授获得的成果。文章称，李巨从原子尺度设计出
的新材料，在未来新能源领域有着应用。李巨成功了设计了全球最小的电池。该文特别
介绍李巨从他在中国科学技术大学的大学生活，并介绍说：他在中国科大培养了对电子
工程与计算机科学的浓厚兴趣。这些兴趣引导了李巨教授使用材料的计算机仿真手段去
了解如... 阅读全帖 |
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p*****i
发帖数: 1281 | 43 就那么几个包子，送完为止。。。
Tue Jan 11 16:22:12 2011
panic(cpu 0 caller 0x2aab55): Kernel trap at 0x0049a20e, type 14=page fault,
registers:
CR0: 0x8001003b, CR2: 0x5ef72bf0, CR3: 0x00100000, CR4: 0x00000660
EAX: 0x0f088b7c, EBX: 0x5ef72bbc, ECX: 0x021f0000, EDX: 0x0ee7fe80
CR2: 0x5ef72bf0, EBP: 0x83b2be78, ESI: 0x00000000, EDI: 0x12605b58
EFL: 0x00010202, EIP: 0x0049a20e, CS: 0x00000008, DS: 0x0d0f0010
Error code: 0x00000000
Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x83b2bc48... 阅读全帖 |
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N********n
发帖数: 8363 | 44
There is talk about sub-nanosecond machines already now. 80% of the
current trading is done by HFT. The market is simply rigged. |
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g*****g
发帖数: 34805 | 45 You have no idea about scalability. Java is not a great fit for low latency
real time requirement. e.g. Main stock exchange where every nanosecond
latency makes a difference. As long as that's not required, Java will handle
it as well as any language exists today. In fact, there are many apps
written in Java or JVM languages that support hundreds of millions of users.
But it's hard to find one for C++ at that scale.
And some of your examples are absurd. If Lady Gaga posts a tweet, 30M users
rece... 阅读全帖 |
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g*****g
发帖数: 34805 | 46 You have no idea about scalability. Java is not a great fit for low latency
real time requirement. e.g. Main stock exchange where every nanosecond
latency makes a difference. As long as that's not required, Java will handle
it as well as any language exists today. In fact, there are many apps
written in Java or JVM languages that support hundreds of millions of users.
But it's hard to find one for C++ at that scale.
And some of your examples are absurd. If Lady Gaga posts a tweet, 30M users
rece... 阅读全帖 |
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T********i
发帖数: 2416 | 47 你可能没看过这个：
这个不是我做的。我就问你你信不信？
The 9.6 million IOPS was accomplished with Auto-Commit Memory, which
maintains the persistence of flash at performance levels in the nanoseconds,
running on directFS. A nonvolatile memory optimized file system developed
by Fusion-io, directFS eliminates duplicate work between the host file
system and flash memory management software. The performance numbers were
achieved utilizing single threaded, single queue depth 64 byte writes to the
Auto-Commit Memory log.
http:/... 阅读全帖 |
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g*****g
发帖数: 34805 | 48 我已经说过很多次了，顺序写和并行写差距是很大的。你要维护余票，就只能顺序写。
厂商的这个测试不符合要求。硬件写的能力跟数据大小关系也很大，这是64bytes的写，
超过512B，这个硬件的只能写140K/秒。你如果要对数据压缩，CPU解压又受不了了。
总之，20行的程序不敢写，打嘴炮是没用的。
nanoseconds,
the |
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P********l
发帖数: 452 | 49 １．好牛逼．
２．不便宜．
３．很怪异．
不会丢的内存数据库：Auto-Commit Memory
But, what if an application could designate a certain area within its memory
space as persistent, and know that data in this area would maintain its
state across system reboots? This application would no longer have the
burden of following the multi-step block I/O pathway to persist that data.
It would no longer need smaller transactions to be packaged into 4k blocks
for storage. It would just place selected data meant for persistence in this
de... 阅读全帖 |
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