x*********i
发帖数: 2 | 1 I think there's nothing wrong about being proud of your city
and people. Most Tianjin girls I met in college spoke
perfect Mandarin and are pretty elegant ladies. I'll say
Tianjin MM are generally good. Do you know there is a
performer at Boston Ballet who is from Tianjin? He's pretty
handsome. I don't know if Nutcracker is on this year. Last
year he was performing in the show. Check the website you'll
see him.
One day in summer I was on the street in New York City, and
heard an old couple speak |
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a*******t
发帖数: 891 | 3 I am trying to determine the capacity of a webserver. The method I use is to
use multiply client computers opening multiply web browsers to try to stress
the NT 4.0 server with IIS. The server performance will be logged using
Performance Monitor. My question is, what entries do I need to log to show the
client wait time etc, thus telling me the capacity of the server?
Thanks! |
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b********n
发帖数: 609 | 4 【 以下文字转载自 Programming 讨论区 】
发信人: bluedaemon (兰魔), 信区: Programming
标 题: 请问有哪些high performance TCP statck on LINUX?
发信站: BBS 未名空间站 (Mon Jul 18 19:55:15 2005), 站内
发信人: bluedaemon (兰魔), 信区: Linux
标 题: 请问有哪些high performance TCP statck on LINUX?
发信站: BBS 未名空间站 (Mon Jul 18 19:55:02 2005), 转信
perhaps a user space implementation. i am trying to avoid
copying data from kernel to user space back and forth in read and write data
from and to the socket. No blocking thread model. Thank you very much! |
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os
发帖数: 81 | 5 osted from LISF
Download Address: http://www.lanken.com/forum/viewtopic.php?t=62
High Performance MySQL: Optimization, Backups, Replication, Load-balancing and More.
ISBN: 0-596-00306-4, O'Reilly, April 2004.
294 Pages, Paperback.
As users come to depend on MySQL, they find that they have to
deal with issues of reliability, scalability, and performance -
issues that are not well documented but are critical to a smoothly
functioning site. This book is an insider's guide to these little
unders |
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w********i
发帖数: 244 | 6 Hi All,
what 's maximum rows for itemtemplate in ASP.net repeater?
I returned the string value from C# but it costs time . The performance is
bad. I know to use the paging for that. If I do not use paging, how to
improve the performance? Thank you very much!!! |
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m****r
发帖数: 141 | 7 【 以下文字转载自 JobHunting 讨论区 】
发信人: mitcar (mitcar), 信区: JobHunting
标 题: 有人面过 Akamai 的Sr. Performance Engineer?
发信站: BBS 未名空间站 (Sun Aug 4 00:44:55 2013, 美东)
请问， 有人面过 Akamai 的 Sr. Performance Engineer ?
on-site 问一些什麽问题 ？
Any help would be really appreciated !
谢谢 |
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z******c
发帖数: 2 | 8 It's really the design philosophy of C++ that makes it fast or
say efficient. Java is not designed to compete with C++ on
performance.
1. For the type of web programming, a lot of time is spent
on DB acess, network or maybe load balancing. As long as
the performance of language meets some bootom line, it's just
fine.
2. In the "gotta have it now" atmosphere of system development,
people would rather go with Java to have a running system next
month, instead of next year.
3. Because of the power a |
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g*****g
发帖数: 34805 | 9 How is ejb3's performance, they look like spring bean and I expect
similar performance, shouldn't be bad right? |
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s*******e
发帖数: 3042 | 10 Gut feeling is that you have I/O ops in a synchronized block, which is
always a practice causing many uncertainties. However, in your original post
you said the performance only deteriorates when the number of clients
exceeds 5. Are all clients reading from the same data set? If the answer is
yes and the performance only depends on the number of clients, then you may
have too much synchronization for reading which is neither necessary nor
good.
Not sure how your system is designed, but you may w... 阅读全帖 |
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q**********r
发帖数: 465 | 11 用Java 读写LAN上面windows shared folder上的大文件，performance很差。
同样的程序，
如果读local文件，速度基本跟硬盘速度匹配。
在高速硬盘上接近200MB/s 也是可以实现的。
但是同样的硬盘，如果通过LAN windows shared folder文件来读取，
则速度降到20MB/s - 40MB/s左右。
不管硬盘有多快。
但是同样的网络映射盘，用ATTO 等 硬盘测速软件测速则没有问题。
传输速度基本可以接近gigabit 网络极限
(around 80MB-90MB/s)
只有java 程序不行。
试过bufferredInputStream, 但是FileChannel更快一些。
另外，Java7, Java8也比Java6几乎快一倍。（我指网络文件读取performance）
但是最快也就是40MB-50MB/s左右了。再也快不起来了。
读慢，但是写的速度居然正常！
正常的意思是说，java向网络硬盘写入文件的速度，可以达到跟其它测速软件相当的速
度。
即可以达到或接近gigabit LAN的极限。
这就奇怪了，为什么 读就几乎... 阅读全帖 |
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b******n
发帖数: 592 | 12 it is said C++ performs the best on this task among four languages..
It is always better to understand more languages and choose the right one
for each task. Also, if you know one language better, you probably
do better programming with it.. not mch information here
C++'s performance advantage is pretty well-know..
+, Java, Scala and its own programming language Go – and then benchmarked
results to find "factors of difference".
the paper says.
which were done at a level of sophistication that w... 阅读全帖 |
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z***e
发帖数: 5393 | 13 ...
有人给我解释一下么？我水平比较低，不是很清楚为啥C++ performance比java强也可
以发paper了...难道以前有人认为c++ performance不如java？？ |
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t*********t
发帖数: 278 | 14 Hello,
I have a phone screen tomorrow with an internet company that has a high
traffic portal website. I was told the screen will be very technical and
probably focusing on algorithm/pattern/paradigm for performance/efficiency
of the code.
Although I have quite some experience in the industry focusing on Java/XML,
my experiences are mainly in the area of business logic/architecture/
integration/client customization, and I am not a "hardcore" coder.
Although many of the questions to be asked in t... 阅读全帖 |
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c*******u
发帖数: 1657 | 15 现在工作中维护一个Portal，平台是Java+Jboss，数据库是oracle和cassandra，
framework是开源的liferay(基于spring, hibernate的一个portal开发框架)。整个
portal除了对user,account,role,permission等等有insert/delete/update操作，其他
的都是纯读操作。
现在user大概有几万个，account大概有几千个，permission大概有上百个，现在运行
起来难度不大，唯一的performance问题就是用户登录的时候查询时间有点长，因为这
个authentication的机制当时设计的时候有点复杂，一个account可以有多个role，一
个user也可以有多个role，role可以组成role group，每个role对应一些permission，
permission在liferay内部还要join几个表来查询显示的portlet，所以登录时间经常在
十几秒钟，请问有什么办法能在不重新设计认证机制的条件下提高performance吗？据
说在接下来的一年内，用户将增至几十... 阅读全帖 |
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l***n
发帖数: 606 | 17 替朋友发贴。 我有一个朋友是CPA candidate和 CFA candidate, 正在面试
performance analyst的工作，工作内容主要是记算和确认各种fund的performance. 想
知道这个行业的career path和发展前景。另外有accounting方面的工作offer, 正在决
定要不要拿。因为他个人希望向investment research的工作方向发展，不知道那个工
作对长远发展更好些。
多谢！ |
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p*********h
发帖数: 117 | 18 经常看到有些文章尤其是国内写的，在提到第一次做出XXX时，用“XXX was firstly
performed.../introduced to XXX system...”是该这么写吗？我怎么觉得说“第一次
做”时应该是“...performed for the first time”才对？ |
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s*****2
发帖数: 117 | 19 有多检测方法的BER，比如a,b,c,d等4种方法。
其中a是最优的，其他三种方法是suboptimal的
想比较一下在某几个点的时候这几种次优方法的performance loss,
请问该用和表达式来表达各种方法的performance loss?
比如：-10*log(b' ber/a's ber)
还是：-20*log(b' ber/a's ber)
or -*log(b' ber/a's ber)
或者其他表达式？thanks |
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S***i
发帖数: 50 | 20 Hi,
First of all, I am wireless communication system backgroud,so I would like
to hear comments from system point of view, not antenna design.
There is a debate regarding to impact to system performance (link budget,
PER performance etc.) due to antenna directionality, such as RX-omni vs. RX-
directional.
Directional RX has a higher antenna gain, which will translate into a
constant shift in term of PER vs. SNR curve.
However, directional RX is narrower than omni-RX, which means less num |
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l********1
发帖数: 13 | 22 请问下面这两个词具体指什么意思呢？
input Biological demand of oxygen to secondary settler，
performance input Biological demand of oxygen to secondary settler。
我有点分不清，特别是performance input Biological demand of oxygen to
secondary settler到底指的是什么呢？
谢谢！ |
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t**********6
发帖数: 565 | 23 【 以下文字转载自 Working 讨论区 】
发信人: coolsheng (coolsheng), 信区: Working
标 题: Diesel engine performance engineer
发信站: BBS 未名空间站 (Wed Aug 4 21:20:06 2010, 美东)
我们公司在indiana，主要设计生产Diesel engine，我所在得是公司得研发部门，现在
在招有Diesel engine performance engineer，公司为了省钱希望招一些fresh得，MS
和 PhD 都可以，进来后根据背景可能给的职位不同，有兴趣的可以给我发简历，谢谢
～～～ |
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c*****0
发帖数: 9 | 24 The ECFMG(r) Reporter
An E-Newsletter for International Medical Graduates Pursuing Graduate
Medical Education in the United States
Issue 137 - April 2, 2009
**********************************************
IN THIS ISSUE:
- 2009 MATCH PERFORMANCE -- NUMBER OF IMGS MATCHING INCREASES
**********************************************
2009 MATCH PERFORMANCE -- NUMBER OF IMGS MATCHING INCREASES
For the seventh consecutive year, the number of first-year (PGY-1)
residency positions offered through the Match |
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g********e
发帖数: 30 | 25 PS 0 means performance status of zero
老板要在中国办关于肺癌的讲座，要我翻译slides成中文。
请问个位前辈有没有人知道performance status of zero怎么翻译？
前后文是：
3 Patients
No distant disease
Able to tolerate any therapy (PS 0)
Assume Resectable
在此先谢谢了！ |
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h*******s
发帖数: 4 | 26 Issue 202 - March 21, 2013
IMG Performance in the 2013 Match
For the eleventh consecutive year, the number of first-year (PGY-1)
residency positions offered through the National Resident Matching Program&
reg; (NRMP®) Main Residency Match® increased. A total of 26,392
first-year positions were offered in the 2013 Match. This represents an
increase of 2,358 positions compared to last year and an increase of nearly
5,800 positions since 2002.
The number of IMGs who matched to first-year po... 阅读全帖 |
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发帖数: 1 | 27 Step2 CS 我一个月考了两次。为了不让大家重复我的错误，也为了感谢所有支持和
帮助我的人，我的总结如下。
1st attempt: CS fail in the CIS component.
2nd attempt 1 month later: all three areas are high performance 星星 在最右
边.
总结：
1)关于准备考试。Step 2 CS first aid book足够。Mini cases 锻炼 developing
ddx, full-length cases 锻炼问问题，随机应变，和记忆的能力。Full-time的话一
个月足够。
2)关于补习班，还是很有必要的。补习班我上了两个，usmle gold review –new
York 和 Ximedus- Florida. 两个各有千秋。 Ximedus 组织更好，更偏重于
communication 和 interpersonal skills 的训练，也是外国学生最欠缺的。前提是对
一般的病例要比较熟悉。 USMLE Gold纽约感觉乱哄哄的，但是更擅长对病例的总结，
尤其... 阅读全帖 |
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发帖数: 1 | 28 Step2 CS 我三个月考了两次。为了不让大家重复我的错误，也为了感谢所有支持和
帮助我的人，我的总结如下。
1st attempt: CS fail in the CIS component.
2nd attempt with 1 additional month's preparation: all three areas are high
performance 星星在最右边.
总结：
1)关于准备考试。Step 2 CS first aid book足够。Mini cases 锻炼 developing
ddx, full-length cases 锻炼问问题，随机应变，和记忆的能力。step 1, CK都不错
，英语也不错，Full-time的话一个月应该够用了。英语一般，2-3个月也就可以了。
2)关于补习班，还是很有必要的。补习班我上了两个，usmle gold review –new
York 和 Ximedus- Florida. 两个各有千秋。 Ximedus 组织更好，更偏重于
communication 和 interpersonal skills 的训练，也... 阅读全帖 |
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l***n
发帖数: 606 | 29 替朋友发贴。 我有一个朋友是CPA candidate和 CFA candidate, 正在面试
performance analyst的工作，工作内容主要是记算和确认各种fund的performance. 想
知道这个行业的career path和发展前景。另外有accounting方面的工作offer, 正在决
定要不要拿。因为他个人希望向investment research的工作方向发展，不知道那个工
作对长远发展更好些。
多谢！ |
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S******y
发帖数: 1123 | 30 We have been using a nightly SAS modeling and reporting application,
which perform data extraction against daily-updated csv files, and then
perform non-linear regression analysis daily.
I am told to re-write the whole thing in R.
I have no problem in building the same logic in R.
But how to make it a daily scheduled job on Windows XP? (for example, my
R job is named _main_job.R, which is a text code file)
Many Thanks! |
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f**********t
发帖数: 1001 | 31 准备面试中。那个组叫email strategy group，职位是Statistical
Marketing Analyst。描述是：“This person will provide ad-hoc
data analysis and work with team members to analyze key
variables that impact email performance and list growth.”需
要"create models to optimize response"。
这个email performance咋理解？是由顾客对于email的response来决定的么？
还有一种理解就是让垃圾邮件尽可能少，把垃圾邮件过滤掉。
另外都有些啥key variable呢？
非常感谢！！！ |
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f**********t
发帖数: 1001 | 32 呵呵。自己抛一下砖。
我的理解是公司会发出很多广告email来吸引顾客消费，有一部分顾客会点击广
告，点击广告的一部分顾客会买产品。目标是希望有最多的顾客买产品，希望list
growth最大(顾客增加量最多)。
email performance的建模感觉是用Logistic regression来做。target是
消费者占邮件总数的比例。然后想到这里卡壳。。。
1.都有哪些变量可能会影响email performance？
2. list growth怎么弄？
么？ |
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y*****n
发帖数: 5016 | 33 has anyone created any early performance report (very similar to validation-
odds report but shorter performance window) before? how do you select
baselines and measurements? exactly the same as validation-odds, i.e. use
development, OOT, etc as baseline and KS, divergen, roc/gini, pdo, slope,
etc as measurements? or something simpler? |
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A*******s
发帖数: 3942 | 34 就是copy & paste validation report，
只不过把target variable从performance in long forecasting horizon改成
performance in short forecasting horizon
友情提示，这个report不是重点
重点是用survival model instead of logistic model
要不一般report结果会很难看。
validation- |
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c*********y
发帖数: 122 | 35 You probably need to change bad definition if the performance period of your
model is longer.
For example, for acquisition model, if the performance window is 18 months
and bad definition is bk/charge-off/90+, you might want to change to 30+ in
9 months which will be dependent on your portfolio. Other stuffs are the
same.
It seems that there is no risk reporting template in your company. Just
curious how they manage the portfolio. |
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r***6
发帖数: 401 | 36 Dr. Ed Ashby has some extensive archery hunting research.
Here is the analysis on broadhead performance:
http://www.alaskabowhunting.com/Ashby-Broadhead-Performance-W15
Summary:
1. Many broadheads are too fragile, bending or breaking on impact, thus
limiting penetration.
2. Rigid single blade broadheads are the least prone to damage on impact.
3. The most lethal shot angle is with the animal quartering away from the
archer.
4. The least lethal shot angle is with the animal quartering towards th... 阅读全帖 |
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E**********e
发帖数: 1736 | 37 你看看我原来的帖子， 这也是我的问题， 接机请教达人。
CV 和modeling performance的 evaluation 应该是独立的。 CV 只是用了检测你的
modeling procedure 合不合理。 用CV里的test data的 performance看model 是不是
好要小心。如果40000数据先用来选预测力强的变量，然后用这40000的数据进入 CV，
你得到的在test 上的结果就是biased， 一般来说要好一点。
我的折中就是用40000来预选变量， 但是评价model 好坏不要用40000里的test 数据。
而是没有碰过的10000数据。 还有，这个10000可不是随机的， 一般是最近一段时间
的数据。 如果是随机的， 也是没有意义的，它其实就是约等于test 数据。
以上40000只是个例子。你要是有10000以上的training 数据， 你可以再选出3000 用
来预选变量， 然后不用。 剩下的7000用来CV。 因为3000的数据基本上可以把变量的
预测力给显示出来。
问题是很多小公司只有5,6000数据。 这就比较challenging... 阅读全帖 |
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z*******n
发帖数: 1034 | 38 New Android Compilers for More Performance by Abel Avram on Dec 04, 2014
Eric Lafortune, Technical Director of Saikoa, maker of DexGuard, has
discovered new tools in the SDK for Android 5.0 Revision 1 (API 21.1),
namely two compilers called Jack and Jill. These tools are meant to
streamline the compilation process for Android.
Google introduced the Android RunTime (ART) as an experimental utility in
KitKat, and made it the default runtime for Lollipop, replacing Dalvik. ART
takes DEX bytecode an... 阅读全帖 |
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l****r
发帖数: 21884 | 39 http://www.youtube.com/watch?v=fArRox7Ez8o
前面的二重奏很震撼，后面的《我的祖国》很感人，看下面的评论很有趣
查了一下二重奏的合作者：
For the occasion, Lang Lang will perform the traditional Chinese "My Home
Country / Big River" as a piano solo. Also on the program, Lang Lang, will
perform a selection from Ravel's 'Ma Mere L'Oye' with legendary American
jazz pianist and frequent collaborator, Herbie Hancock. |
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x*****n
发帖数: 3422 | 40 A048 is a DOT-approved race tire, not street legal ah :-)
imho, AD07's performance doesn't deserve such a high price.
The current KING is Bridgestone RE-01R, performance/comfort/treadlife wise,
search it you will know.
Even RE-01R is still too expensive for me. I will shop around for Falken RT-
615/Dunlop Z1 star spec/Hankook Ventus RS-2 this winter.
Also the new Kuhmo XS looks interesting on paper, but I didn't get much
response from others yet. Someone has to be the Guinea pig eating the crabs |
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c*********r
发帖数: 19468 | 41 如果M Sport也还保留的话，貌似就是：
M Sport Pkg只增强悬挂等，不涉及动力提升
M Performance Pkg则会增强动力
但不清楚这和同车系的M Performance car如何区分
然后当然M car还是在最上层，如果不算M3 GTS这种特殊的限量型号的话
20ps |
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f****0
发帖数: 47 | 42 今天陪朋友去试驾了2013 Tesla Model S performance，自己也亲自试开了20分钟。
Sales选的测试路线不错，有好几个大弯，merge to highway,穿过小路，到偏僻路段0-
60，基本上把各种路况都试了下。结果就2个字：震撼！
平时自己commute用的是Cayenne S,也开过panamera S和BMW M5,但当亲自感受到tesla
的无停顿快速加速时，还是非常震撼。 象燃油机的dual clutch,Turbo等在电动车面前
简直就是浮云，电动车直线式的油门立即响应，无停顿的加速根本不是M5这些Turbo可
以比的，毕竟电动车本身的技术优势摆在那里。
操控方面，Tesla连续过弯没有感觉到roll over,suspension对不同的路面感应也很好
，应该和Cayenne，M5差不多，比panamera 稍逊一些。可能平时开惯了自己的车，觉得
Tesla的方向盘偏大，在精确性上也比panamera 要稍逊一些。总体而言，Tesla model
S performance确实值得买，如果我自己准备换下一部车那很可能就是它了。
燃油机车的先天... 阅读全帖 |
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f****0
发帖数: 47 | 43 leaf 应该只是省油，performance没法和Tesla比。 Tesla在电动车的powertrin 有他
们的专利，在model s performance上还用了特殊的变压器，所以加速性能惊人。不过
就算model S的基本款0-60 5.9s 已经秒杀BMW 528了，中间款0-60 5.4s 也超过535了
。 |
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x*b
发帖数: 5723 | 44 Autoweek也被邀请了，透露了更多的细节哦，Turbo确实是395hp/406lb/ft。S居然用的
是Audi的3.0 v6 supercharged，有点意外啊。
不过车重只有3750lbs起，这个实在太牛了。即使Turbo最后车重超过4000，这车干掉普
通sport sedan毫无问题。
http://www.autoweek.com/article/20131008/CARNEWS/131009813
We first found ourselves in the heavily contoured passenger seat of the
Turbo Macan that is set to lead the Macan line-up. It is powered by a twin-
turbocharged 3.6-liter, direct injected gasoline V6 engine that, up to now,
has only been offered in naturally aspirated guise. The adoption o... 阅读全帖 |
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w*******y
发帖数: 60932 | 48 A whole group of performance bike coupons just came out in their latest
mailing.
These are the best performance bike coupons i've seen in awhile. Bike
equipment and parts are hard to get for good prices!
www.performancebike.com/:
http://www.performancebike.com/
Use "723" online or in-store to get $25 off $100.
Use "724" online or in-store to get $50 off $200.
Use "727" online ONLY to get 10%, no restrictions
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