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全部话题 - 话题: 5ms
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w****e
发帖数: 586
1
这个东西基本显示器都比电视好很多,游戏专用的显示器又更加强悍,vg248qe和明基
xl系列都可以控制在5ms左右。然后就是dell的u系列带低延迟游戏模式的,在10ms以内
d*****x
发帖数: 18
2
在大家的帮助下我以已快速入门。基本在newegg搞定,有一些小deal,不太多,咧给大
家观赏观赏
1 Intel Core i5-4460 Haswell Quad-Core 3.2GHz LGA 1150 Desktop Processor
Intel HD Graphics 4600 BX80646I54460Item #: N82E16819117302CPU Replacement
Only Return Policy $189.99
1 CORSAIR CX series CX500 500W ATX12V v2.3 80 PLUS BRONZE Certified Active
PFC Power SupplyItem #: N82E16817139027Standard Return Policy $49.99
1 ASUS GTX750TI-OC-2GD5 G-SYNC Support GeForce GTX 750 Ti 2GB 128-Bit GDDR5
PCI Express 3.0 HDCP Ready Video CardItem #: N82E168141... 阅读全帖
p***6
发帖数: 939
3
各位大家好,
我现在电脑的配置是
CPU i5 3770,
主板 Z77,
内存 16gb,
电源 650W.
显卡 无
显示器 24寸的ASUS VS239H-P,10分钟眼睛就受不了
打算最近入GTX970,65%看网页看电影,35%打游戏,无专业需求
肯求硬版大神推荐信护眼显示器, 要求如下
预算<300usd, 23<尺寸<27, 分辨率=1080p就可以,刷新率>60hz,response time<5ms
个人偏向gloss屏,Benq,不大懂什么护眼,
k**0
发帖数: 19737
4
现在市面上 4K IPS @60hz HDMI 2.0/DSP 1.2, 30寸上, <5ms 的显示器一只手数得过来
不过这是大势所趋, 30寸以上TN屏显示器有视角色差。

发帖数: 1
z****e
发帖数: 54598
6
来自主题: Java版 - Java StringBuilder myth debunked
new的话,我在我的macbook pro上测验的结果
10^4条语句,用时5ms
z*******3
发帖数: 13709
7
20年前,人们还担心new这个关键字执行效率太慢
到最近,google搞的guice干脆就默认是每一次都去new
因为new这个东西执行的效率已经不低了
大概new1000个也就是5ms左右?
有兴趣的在本机上自己试试
然后如果你尝试复用代码的话
反而需要一定的知识基础,因为可能会造成内存泄漏
所以推荐的话
guice就推荐你每次都new
spring就默认是复用,但是你要明白你在做什么
ejb介于两者之间
d**********x
发帖数: 4083
8
恩,1000个也就是5ms左右
未经优化的内存池直接可以让你的程序仆街
你这里面有一句话说得非常有道理,就是“你要明白你在做什么”,不仅仅是spring如
此,一个基本合格的程序员在做任何事情的时候,都要明白自己在做什么
z*******3
发帖数: 13709
9
我居然看到了台湾人的用语
我刚试了下,new 10^4+1个对象才用了5ms
我这还是一般的laptop,server就不用说了
内存优化最简单的就是new完gc掉
我记得谁刚在java版说过,他们优化内存的方式就是把spring缺省的singleton改成
prototype
这样就不会让spring在启动时候把所有的service全部常驻内存,动态取舍对象
不用的就gc掉,这样反而节省内存,spring这种singleton反而浪费
然后gc的话可能会有pause问题,这个可以通过调整虚拟机参数来搞定
实在不行,上pauseless的jvm,不过这种产品没有多少人买
以前听说sun要收购它,后来不了了之,大多数时候jvm足够用了
w**z
发帖数: 8232
10
来自主题: Programming版 - 其实最大的hype是web service
一般应用足够了。Jersey 的overhead 应该小于5ms.
T********i
发帖数: 2416
11
goodbug和zhaoce都是输不起的。而且辩论的品格非常不好。本来不打算回应就算了。
之所以回应就是因为害怕谬种流传。很多不明真相的网友把谬误当作真理。当然也包括
这两位。
goodbug号称用cassandra方案解决我提出的春运售票问题。在我提出我的方案
performance的throughput比他的高1-2个数量级的情况下。他认为他的方案可靠性比我
的好。理由是能够同步写log到磁盘。在我提出用磁盘(磁盘是机械式的,SSD不是磁盘
,是基于半导体的)同步写每秒不到千的情况下,他给我一个链接和一张图。号称【
quote】写一个结点能到1000,写100个就可以接近10万。【quote】
我只能这种人的基本功连做一个普通程序员都不见得够格。如何能有人追捧他?看来公
共论坛水的嗓门大貌似水有理。
简单说一下:
1. 操作系统下普通的文件写操作一般是写到缓冲区,然后由OS schedule磁盘的写操作
。要强制flush缓冲区需要特殊API fsync。这个过程很费时,而且是blocking的。因为
普通磁盘的寻道时间都在5ms以上。IOPS(IO per second)不会很高... 阅读全帖
w**z
发帖数: 8232
12
来自主题: Programming版 - throughput: 10k/second, latency: 150ms
我们用Jersey, overhead 很低, < 5ms. 一个tomcat handle 3K/seconds 应该没问
题。你那business logic (including DB access),我就帮不了你了。
p*****2
发帖数: 21240
13
来自主题: Programming版 - throughput: 10k/second, latency: 150ms

5ms都干了什么了?
w**z
发帖数: 8232
14
来自主题: Programming版 - cassandra的eventual consistency怎么破?
比谁差一大截?
我们quorum write latency 90th percentile<2ms, quorum read 90th percentile <
10ms 几十ms 怎么都够用了
我们从 ws 出去 99th percentile read 也就 30ms, 99th percentile write < 5ms
看一下你的C* tune 好没有, schema 怎样,不觉得read/write consistencey 会有
多大影响。

读。
h******b
发帖数: 6055
15
来自主题: Programming版 - 谈谈为什么上scala
觉得发掘node本身的潜力可能会更好。
我觉得你开发起来爽的语言,就是好语言。 其实很多东西在于程序员本身的修养还有
项目架构本身,语言只是很小一部分。
哪怕php这么老的语言,都是学无止境,参考facebook。 你们能把node弄到5M / 5ms
,感觉已经很强了,没必要放弃。
p*****2
发帖数: 21240
16
来自主题: Programming版 - 谈谈为什么上scala
我不太喜欢什么东西都硬上一种语言
我觉得node go scala应该够了

5ms
m****r
发帖数: 51
17
来自主题: Programming版 - windows平台的消息机制
windows下c++程序,进程间传数据,现在使用的是win32的系统消息机制传,10个左右
的子进程传到一个主进程,从log文件看大概3-5ms传一条消息,这里面log文件io估计
需要耗费一点时间,现在想用zmq的tcp/ip方式传会不会快一点?
b*******g
发帖数: 1309
18
来自主题: Chemistry版 - 请教质谱做SRM的离子利用效率
你这个应该叫transmission efficiency,QQQ,从形成离子进入Q1开始算,到Q3,效率
超过90%,好像在95%以上,所以要提高LOD必须在ionization source 跟Q0上下功夫。
举个例子AB Sciex 的6500跟5500 的区别就是source enhance 2倍LOD,Q0(Qjet)
enhance 2倍2LOD,共计4倍LOD
QTOF 的ion transmission主要是损失在 flight 过程中,另外TOF的pulse frequency
并不慢,大部分仪器都在 20kHz 左右,就是0.05ms一次。
速度慢在仪器跟电脑之间的传输,没想到吧,每个TOF的spectrum在被digitization过
后从instrument到电脑需要的时间在ms ,这段时间TOF只能idle等digitizer
clearance
所以QTOF效率取决于duty cycle time跟飞行过程中的离子损失。QQQ现在的duty cycle

般可以到2-5ms per MRM,但是QTOF最快能到10ms,一般只能到50ms。意味着同样的时... 阅读全帖
b*******g
发帖数: 1309
19
来自主题: Chemistry版 - 请教质谱做SRM的离子利用效率
先回答TOF的问题,你的理解不是很正确。
应该是放慢QTOF scan 速度 (就是增加 duty cycle 时间)增加灵敏度,但是跟
resolution无关。
一个pulse的时间,比如5ns的pulse跟50us的flight time 都是不能改变,或者很难改
变。必须加高pulse的电压才能缩短飞行时间(或者把flight tube该短)。缩短飞
行时间才能增加pulse frequency。
能改变的就是每个cycle里面pulse的数量, 如果做100个pulse是5ms (100X0.05ms)
加上digitizting 时间(假设10ms, 我还没查到具体数据,在2ms到几十之间),这样
一个cycle是15ms
如果增加到400个pulse,一个cycle就是30ms.
每个cycle产生一张谱图,每个谱图是所有pulse信号的叠加。100个pulse的信号只有
400 个pulse的1/4. 如果pulse数继续增多,dwell time(简单看就是digitizing时间
)不会减少,但是占的比例就越来越少,说所以信号损失越来越少。
所以说放慢QTOF sc... 阅读全帖
a****l
发帖数: 8211
20
来自主题: EE版 - 推荐一款单片机
you are definitely right. This is the reason why I am wondering why this 100
cycle delay is making LZ to miss the 5mS deadline.
gr
发帖数: 2958
21
看了一下,他们组虽然不大,但是做的好像还不错啊。2phD+5ms
前两年发的prize paper蛮多的。
22个PHD 11个faculty,算效率比较高的老板了。混faculty人脉很关键的。
而且他ms是传说中的Ziogas那个组毕业的。
t*m
发帖数: 208
22
digital mic reduce the noise on board where signal is still in BB. BT or
WIFI send it out in RF. The delay maybe related to audio frame. Maybe the
audio samples are sent out in groups (eg, 160 samples) to reduce power
consumption, this add some audio processing latency and then higher than 5ms
.
b******3
发帖数: 183
23

your
今年的lv展中已有某个企业做出5ms延迟的mic产品,只是不知道他们用的是那个chip
f**d
发帖数: 768
24
来自主题: Neuroscience版 - eBook: From computer to brain
这是一本计算神经科学的优秀著作,全文拷贝这里(图和公式缺),有兴趣的同学可以
阅读
如需要,我可以分享PDF文件(--仅供个人学习,无商业用途)
From Computer to Brain
William W. Lytton
From Computer to Brain
Foundations of Computational Neuroscience
Springer
William W. Lytton, M.D.
Associate Professor, State University of New York, Downstato, Brooklyn, NY
Visiting Associate Professor, University of Wisconsin, Madison
Visiting Associate Professor, Polytechnic University, Brooklyn, NY
Staff Neurologist., Kings County Hospital, Brooklyn, NY
In From Computer to Brain: ... 阅读全帖
i********n
发帖数: 14
25
Intel I3 550 ( 配合主板稳定上3.8g)
Asrock 主板
Radeon HD 4890 1GB 256bit GDDR 5
8GB 4*2 DDR3 1600
WD 250G
TT V3 case with 430w power supply
Acer 22 5ms LCD
Logitech USB Wireless Ergonomic Wave Combo Keyboard
w*******y
发帖数: 60932
26
Dell S2309W 23-inch Full HD 1080p LCD Monitor w/ 3-year warranty for $159 FS
+ tax
* 23" LCD; Full HD 1920 x 1080 Resolution; 5ms Response Time
* DVI-D & VGA; 300nit brightness; 1000:1 Contrast Ratio; 12.6lbs
* 3Yr PREMIUM PANEL Ltd. Warranty, 3 yr Advanced Exchange
Dell S2309W:
http://accessories.us.dell.com/sna/productdetail.aspx?sku=S23093W&cs=19&c=us&l=en&dgc=CJ&cid=24471&lid=566643&acd=10550055-1727683-
I have this same monitor and love it!
w*******y
发帖数: 60932
27
来自主题: _DealGroup版 - ASUS 24" LCD monitor $154 AR and paypal
Coupon:
Link:
http://www.buy.com/specialty_store_6/paypal-weekly-specials/66655.html
Product:
Link:
http://www.buy.com/prod/asus-vh242h-24-23-6-viewable-widescreen-lcd-monitor-20000-1-5ms-1920-x/q/loc/101/210447662.html
Apply coupong for 25 off 100 then add monitor
189-25 (coupon)-10 MIR=$154
Be gentle, first post.
w*******y
发帖数: 60932
28
TD has this 20" LCD for $99.99 + S/H
BCB also appears to work for this, $87.99
Link:
http://www.tigerdirect.com/cgi-bin/order.asp?EdpNo=6285142&qty=1&SRCCODE=WEM2302BY&cm_mmc=email-_-Main-_-WEM2302-_-tigeremail
I-inc IH202HPB 20" Widescreen LCD Monitor
Pixel Pitch: 0.276 mm

Display Format: 16:9 Wide LCD

Display Colors: 16.7 million

Vertical Refresh Rate: 56Hz to 75Hz

Horizontal Frequency: 24kHz to 70kHz

Condition:
w*******y
发帖数: 60932
29
Acer X233HZBD Black 23.6" 5ms Widescreen LCD Monitor 300 cd/m2 ACM 40000:1(
1000:1)
Deal only lasts 24 hours!
Use promo code: EMCYTZR22
Link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16824009252&nm_mc=EMC-SW061410&cm_mmc=EMC-SW061410-_-index-_-LCDMonitors-_-24009252-L0D
Model
Brand Acer
Model X233HZBD
Cabinet Color Black
Display
Screen Size 23.6"
Widescreen Yes
Recommended Resolution 1920 x 1080
Viewing Angle 170(H) / 160(V)
Pixel Pitch 0.2715mm
Display Colors
w*******y
发帖数: 60932
30
Dell Home
Dell IN2010N 20-inch HD Widescreen Monitor with 1-Year Warranty
$150 - $59 Instant Savings
= $91 ($88 w/ DPA) + Free Shipping
* Relish fast-moving movie scenes and graphics in vibrant clarity
enabled by the fast 5ms response time
* See breathtaking detail, color contrast and rich deep blacks delivered
by the 1000:1 contrast ratio
* Enjoy hours of comfortable movie/media viewing with an onscreen
brightness of 250cd/m2
* Slim, stylish black bezel design fits most home env
w*******y
发帖数: 60932
31
link:
http://www.amazon.com/Proscan-55LC55S240V87-55-Inch-1080p-240Hz/dp/B002YT8CMI
I consider this a much better deal than the Walmart deal at $1100 because
with tax for me that would be $1200, and this one is $989.32 OTD.
Proscan 55LC55S240V87 55-Inch 1080p 240Hz LCD HDTV, Black
Technical Details
240Hz Refresh Rate
Tuner Mode : ATSC
Brightness: 500cd/m, Response Time: 4.5ms, Energy Star 3.0 compliant, RoHS
compliant
Resolution: 1,920 x 1,080, Dynamic Contrast: 30,000:1, Brightness: 500cd/m
Res
w*******y
发帖数: 60932
32
Newegg has the Hannspree ST42DMSB 42" 1080p 120Hz LCD HDTV for $600 - $100
off with coupon code 24HRSALE77C [Exp 7/7] = $500 with free shipping
Brightness 470 cd/m2
Contrast Ratio 1300:1
Dynamic Contrast Ratio 15000:1
Response Time 4.5ms
Connectivity
HDMI 4 In
USB USB 2.0 for Photos and Music
Headphone Yes
Composite A/V 2 In
Component Video 2 In
S-Video 2 In
Power Consumption 113W
Refresh Rate 120Hz
Tuner ATSC/NTSC/QAM Tuner
Link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16889237019&n
w*******y
发帖数: 60932
33
Search for TigerDirect in Bing to yield 15.2% Cashback
Link:
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=6143889&sku=A204-2704
Specifications
Display Area: 27"

Display Type: LCD

Aspect Ratio: 16:9

Contrast Ratio: 100,000:1

Resolution: 1920 x 1080

Response Time: 5 ms

Signal Compatibility: 1080p

Input Video Signal: ATSC
QAM
NTSC

Condition: New

Features: PC Input
z****u
发帖数: 255
34
来自主题: _DealGroup版 - Newegg.com
$30 Mail-in Rebate on Asus P6T Motherboard at Newegg.com, expires 7/31
Expires: 7-31-2010
Tripp Lite SMART500RT1U Smart Pro 500 VA 300 Watts UPS -$119.99 at Newegg.
com, expires 7/31
Expires: 7-31-2010
Western Digital My Passport Essential 1TB Black Portable External Hard Drive
WDBABM0010BBK-NESN -$129.00 at Newegg.com, expires 7/31
Expires: 7-31-2010
lenovo G550(2958-9PU) 15.6 NoteBook, 4GB Memory, 250GB HDD- $399.99 at
Newegg.com, expires 7/26
Expires: 7-26-2010
eMachines E233Hbd Black 23 5ms
z****u
发帖数: 255
35
来自主题: _DealGroup版 - Newegg deals
$100 off (Rebate) on lenovo G560(0679-4TU) 15.6" NoteBook, 4GB Memory, 320GB
HDD - $599.99
$80 off on MNTR HANNSG|LED 23 5MS HL231HPB RT only $179.99
Coupon:EMCYTZT69
$65 off on ZOTAC Atom D510 dual-core MB + OCZ Gold 2GB DDR2 800 Memory only
$109.98
$50 off on Swann SW361-MDS MDV-450 Action Camera - Mini Video Camera &
Recorder only $49.99
$40 off on PARALLELS DESKTOP 4 FOR WIN & LINUX only $39.99
Coupon:EMCYTZT70
$20 off on Recertified: Apple - iPod Touch 8GB - $149.99
Coupon:APPLE727B
$20 off
w*******y
发帖数: 60932
36
Amazon has the Viewsonic VX2250WM for $164.99 with FSSS or Prime
Link:
http://www.amazon.com/ViewSonic%2019s-VX2250WM-LED-21-5-Inch-Widescreen-Integrated/dp/B003HFCDLY/ref=sr_du_1_map?s=pc&ie=UTF8&qid=1282513056&sr=1-1
Alternatively, buy.com through ebay has it for $169.99 shipped
The next lowest price not on ebay is roughly $200(from Google Products)
Specs:
5ms response time
(From amazon)
Product Features
* 22-Inch (21.5-Inch Vis.) LED monitor with sleek design and integrated
speakers
*
w*******y
发帖数: 60932
37
circuit city has a monitor deal of Samsung BX2440X 24" Widescreen LED
Monitor - 1080p, 1920x1080, 16:9, 5ms, 1000:1 Native, VGA, DVI today's price
is $220 -$60 with email coupon which brings the price down to $160 and free
ship. which i think its a good price for a samsung led monitor with full HD
1080p also with cashback you save few bucks more if you need. Last till
midnight today. so get it while it last.
w*******y
发帖数: 60932
w*******y
发帖数: 60932
39
ViewSonic 24" 1080p Widescreen 189.99+FS at Geeks.com
Limit 1 per person, use code VS24 at Check Out.
Link:
http://www.geeks.com/details.asp?InvtId=VT2430-PB-R&cm_mmc=geekmail-_-daily_html-_-16sep10_VS24-_-VS24Main
First post, please be easy.
w*******y
发帖数: 60932
40
Today only. Dell has the Dell 20" IN2010N HD Widescreen LCD Monitor for $100
with free shipping. Sports a 1600 x 900 resolution, 5ms response time, 250
cd/m2 brightness, 1000:1 native contrast ratio, and 160 degree H/V viewing
angles
Link:
http://accessories.us.dell.com/sna/products/Displays/productdetail.aspx?c=us&l=en&cs=19&sku=IN2010P
w*******y
发帖数: 60932
41
Acer X233HZbd 23.6-Inch Widescreen LCD Monitor (Black) from Amazon.com
Link:
http://www.amazon.com/Acer-X233HZbd-23-6-Inch-Widescreen-Monitor/dp/B00387EJB8/ref=sr_1_1
23.6"
1920 x 1080
40000:1(1000 :1)
5ms
DVI (no HDMI)
w*******y
发帖数: 60932
42
Link:
http://www.buy.com/pr/product.aspx?sku=217087128
Tax in CA, MA, NY, TN.
1920x1080; 5ms; 1000:1 contrast ratio; 300nits; DVI & VGA
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