G*******m
发帖数: 16326 | 1 房市里面最重要的三个要素是：location，location，location
股市里面最重要的三个要素是：scalable，scalable，scalable |
|
G*******m
发帖数: 16326 | 2 股市的pick很难，但是scalability就是方法阵式的问题了。
如果0.3的盈利模式可以scalable的，那么只要scale到预先计算好的规模，就可以make
a living了。 |
|
t******0
发帖数: 629 | 3 小弟目前处境：新手，感觉VLSI这一行的术语太多，有的时候大概明白点儿事儿了，却
不知道应该如何学术地表述。
我对parallel的理解，先不提流水线，就是把硬件功能模块增加，用面积来换吞吐量。
我对scalability的理解，就是按照这个设计思路，很容易把更多的硬件模块装进来，
然后吞吐率相同倍数的增加(如果throughput增加，却慢于面积的增加，就是不
scalable)
不知道以上理解对不对。
现在我想描述一个技术，但是不知道用什么术语来说：
比如输入是x1, x2,x3,x4.....xm (m个数)，计算任务是先得出一个 m by m的方矩
阵，然后通过这个矩阵来算其他的东西，矩阵的元素是 f(xi,xj)。
所以总的计算量是m的平方（不考虑矩阵的对称性）。
我们可以用一个f(xi,xj)模块，进行2层循环，这样速度最慢，面积最小；
有的文章用 m 个改进的f模块，一次性地把 m 个输入量（x）都处理了，当然，这
种设计就是为了发论文，m 都不敢很大，而且硬件约束只能允许你处理 m 个数（这一
点还不如串行的设计呢）但是这种文章的关键词都是：paral... 阅读全帖 |
|
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g***t
发帖数: 2278 | 5 【 以下文字转载自 SanFrancisco 讨论区 】
发信人: grant (很吉利的id), 信区: SanFrancisco
标 题: 请教各位高手们PHP和Python是否和Ruby一样有Scalability的问题
发信站: BBS 未名空间站 (Mon Jan 4 14:35:16 2010, 美东)
Twitter 弃Ruby on Rail，但是并没有像Facebook一样选择了Php on Symfony,
而是选择了Scala.
请教各位高手们PHP和Python是否和Ruby一样有Scalability的问题?
我是不明白到底ROR的Scalability问题到底出在哪里？ |
|
t*********t
发帖数: 278 | 6 【 以下文字转载自 Programming 讨论区 】
发信人: transparent (因为寂寞), 信区: Programming
标 题: Can you offer some performance/scalability programming tips (for interview)
关键字: Java,programming tip,performance
发信站: BBS 未名空间站 (Wed Aug 17 19:16:06 2011, 美东)
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 som... 阅读全帖 |
|
t*********t
发帖数: 278 | 7 【 以下文字转载自 Programming 讨论区 】
发信人: transparent (因为寂寞), 信区: Programming
标 题: Can you offer some performance/scalability programming tips (for interview)
关键字: Java,programming tip,performance
发信站: BBS 未名空间站 (Wed Aug 17 19:16:06 2011, 美东)
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 som... 阅读全帖 |
|
G*******m
发帖数: 16326 | 8 scalable 到一个有限的范围应该可以的，到无穷大当然不行。
也就是说，对99%的散户来说，方法对头，可scalable 到散户无穷大。
散户无穷大是有限的。 |
|
G*******m
发帖数: 16326 | 9 对DT来说，scalability同样很重要。
scalability决定可不可以make a living。 |
|
v********0
发帖数: 2 | 10 【 以下文字转载自 CS 讨论区 】
发信人: virtual150 (Cool Mountain), 信区: CS
标 题: Solving long polling scalability problem.
发信站: BBS 未名空间站 (Mon Aug 9 01:28:05 2010, 美东)
Long polling keeps a connection to the server for every request thus
intrinsically having scalability problem.
Anyone on the board has alternatives or a way to solve the issue?
Btw, for those who don't know what I am talking about, please take a look at
the following wiki page:
http://en.wikipedia.org/wiki/Comet_(programming) |
|
s******e
发帖数: 493 | 11 Scalability includes both herizontal and vertical.
For herizantol scalability you should pay attention to tier your app
carefully (read j2ee blueprint would be helpful to you), not leak concerns
among the tier, code your solution component based, and try to avoid
singleton class,etc |
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t*********t
发帖数: 278 | 12 【 以下文字转载自 Programming 讨论区 】
发信人: transparent (因为寂寞), 信区: Programming
标 题: Can you offer some performance/scalability programming tips (for interview)
关键字: Java,programming tip,performance
发信站: BBS 未名空间站 (Wed Aug 17 19:16:06 2011, 美东)
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 som... 阅读全帖 |
|
N*****8
发帖数: 253 | 13 【 以下文字转载自 Programming 讨论区 】
发信人: Nicam08 (Nicam), 信区: Programming
标 题: 求Big Data Principles and best practices of scalable realti (转载)
发信站: BBS 未名空间站 (Fri Oct 31 03:07:53 2014, 美东)
发信人: Nicam08 (Nicam), 信区: DataSciences
标 题: 求Big Data Principles and best practices of scalable realtime data systems MEAP电子版
发信站: BBS 未名空间站 (Thu Oct 30 13:05:58 2014, 美东)
请问各位朋友，如果谁有的话能发一份给我吗？十分感谢。
[email protected]
(function(){try{var s,a,i,j,r,c,l,b=document.getElementsByTagName("script");l=b[b.length-1].previous... 阅读全帖 |
|
g*****g
发帖数: 34805 | 14 Well, let me put it this way. Assume a system starts to break down at load
100 and another at 90, both systems still scale, as long as you put enough
machines behind it.
The linear scalability is more about the architecture than anything. And for
high scalability, high stability on single machine is not required. On the
contrary, we always assume one or more nodes will break down at any given
point on a high scale system, it's just inevitable. |
|
N*****8
发帖数: 253 | 15 【 以下文字转载自 Programming 讨论区 】
发信人: Nicam08 (Nicam), 信区: Programming
标 题: 求Big Data Principles and best practices of scalable realti (转载)
发信站: BBS 未名空间站 (Fri Oct 31 03:07:53 2014, 美东)
发信人: Nicam08 (Nicam), 信区: DataSciences
标 题: 求Big Data Principles and best practices of scalable realtime data systems MEAP电子版
发信站: BBS 未名空间站 (Thu Oct 30 13:05:58 2014, 美东)
请问各位朋友，如果谁有的话能发一份给我吗？十分感谢。
[email protected]
(function(){try{var s,a,i,j,r,c,l,b=document.getElementsByTagName("script");l=b[b.length-1].previous... 阅读全帖 |
|
N*****8
发帖数: 253 | 16 【 以下文字转载自 Programming 讨论区 】
发信人: Nicam08 (Nicam), 信区: Programming
标 题: 求Big Data Principles and best practices of scalable realti (转载)
发信站: BBS 未名空间站 (Fri Oct 31 03:07:53 2014, 美东)
发信人: Nicam08 (Nicam), 信区: DataSciences
标 题: 求Big Data Principles and best practices of scalable realtime data systems MEAP电子版
发信站: BBS 未名空间站 (Thu Oct 30 13:05:58 2014, 美东)
请问各位朋友，如果谁有的话能发一份给我吗？十分感谢。
[email protected]
(function(){try{var s,a,i,j,r,c,l,b=document.getElementsByTagName("script");l=b[b.length-1].previous... 阅读全帖 |
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a*****y
发帖数: 33185 | 17 川大大的MAGA,难道不是可以scalable全宇宙? |
|
g***0
发帖数: 123 | 18 吹牛逼写文档最喜欢用的俩词
我觉得德车的scalability做的还行。
日车的serviceability最好。
两者都不好，叫的最欢的就是美国车，所以F35没戏。 |
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g*******y
发帖数: 2114 | 19 一般而言， 对于海量数据集
算法的scalability类的问题 有什么 通用的思路吗？
谢谢啦
刚开始找工作 |
|
s*****j
发帖数: 1087 | 20 多谢，关于system的optimazaion，scalability的问题 |
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f*****6
发帖数: 61 | 21 RT
请教大牛，面试如果被问到一些scalability的问题，要怎么准备？
比如：
How would you architect a system to process an infinitely sized board game
across an unknown number of users?
How would you design an image sharing website with meta data, privacy
settings, etc?
类似上面这种设计题。
谢谢。 |
|
G*******m
发帖数: 16326 | 22 从一个英语单词scalability说开去。。。。。。
首先做一个survey，
这里认识这个单词的有几人？ |
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G*******m
发帖数: 16326 | 23 这里知道这个单词的形容词是scalable的又有几人？ |
|
|
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v********0
发帖数: 2 | 26 Long polling keeps a connection to the server for every request thus
intrinsically having scalability problem.
Anyone on the board has alternatives or a way to solve the issue?
Btw, for those who don't know what I am talking about, please take a look at
the following wiki page:
http://en.wikipedia.org/wiki/Comet_(programming) |
|
n********a
发帖数: 68 | 27 Scalability:
The ability of a system (RDBMS, in this context) to provide throughput in
proportion to, and limited only by, available hardware resources. |
|
B*****g
发帖数: 34098 | 28 【 以下文字转载自 Programming 讨论区 】
发信人: goodbug (好虫), 信区: Programming
标 题: Re: 基于MS平台的系统，scalability怎么样？
发信站: BBS 未名空间站 (Mon Jun 3 22:25:54 2013, 美东)
Oracle is 48% of market share revenue wise, while DB2 and SQL server are
under 20%. MySQL has a huge market share, it doesn't have a huge revenue
however.
http://www.oracle.com/us/corporate/features/number-one-database |
|
q***s
发帖数: 2243 | 29 java开发过程中，关于 scalable 的问题，应该有哪些要注意的？ |
|
r*********r
发帖数: 3195 | 30 scala 就没有 scalability 问题? it's on jvm, after all... |
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t*********t
发帖数: 278 | 31 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 |
|
g*****g
发帖数: 34805 | 32 Scalability是应用架构决定的，跟用什么做服务器关系不大。关系大的是性能，
稳定性，安全性这些。 |
|
w**z
发帖数: 8232 | 33 Are you serious that trading company is using MS solution?
FB and Twitter are all about HA on large volume rather than consistency, it'
s the different problem to solve. The topic of the discussion is "基于MS平台
的系统，scalability怎么样？" My point is that MS solution is not a right fit
for that. |
|
w**z
发帖数: 8232 | 34 why do you guys keep arguing about the details? It's the fact MS solutions (
OS + .net + sql server + whatever you can throw in) is far behind than other
platforms in terms of scalability and HA. It might be getting better, still
a lot of catch up to do.
Give me one example of large deployment of MS solutions. I can give you
plenty for Linux/Unix + mysql. Let the fact speak please.
close source vs open source. |
|
s***o
发帖数: 2191 | 35 Technology-wise, I don't think Windows, or SQL server, or .NET has problems
with scalability. Licensing is probably the biggest issue. There are other
things to consider, for example, what if you need a high performance web
server like nginx, or you want to use redis for caching, or you need
database clusters for relative simple tasks and don't want to pay big bucks
for those commercial ones...... Many of these alternatives are not available
or their performance is not as good on Windows platfor... 阅读全帖 |
|
c****e
发帖数: 1453 | 36 It's true super large system usually runs on Unix*,as you once get on scale,
you can afford to hire good people to avoid license charge. But as we are
talking about "基于MS平台的系统，scalability怎么样", there are examples from
MS itself:
1. Bing, everything runs on Windows, second to Google, but still a LARGE
deployment, right?
2. Windows Azure: From XBox ONE event, they mentioned new XBox live service
has 300K servers, powered by Azure. I consider 300K servers not small.
For non-techy customers, I know T... 阅读全帖 |
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T********i
发帖数: 2416 | 37 跨DC failover可靠性最高。
实话说cassandra村一个user profile之类的挺好的。我不会意气用事不用他的。话说
回来，真不用他，也不会影响user experience。
无限scalability可以通过加state cache server服务用户达到。每加一个server增加5
million requests/second的处理能力。真正确认有票再真正的抢票server送。抢票
server也是5 million/second的处理。春运那点票。一天的几秒钟就能抢完。当时就能
反馈抢到没有。
实在无聊可以把我自己的web server用上。性能每台机器提高几倍问题不大。1000多行
有效代码就算是security audit的钱也能cover剩下的机器钱。 |
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b***e
发帖数: 1419 | 38 Is it scalable when used as message queue, e.g. resque? |
|
d*******r
发帖数: 3299 | 39 这里谁有这方面系统的经验吗，比如横向比较过各种 scalable 的 message queue:
RabbitMQ (功能多), Kafka (throughput 大), Redis (快, 因为是内存 DB，但是要自
己做 Clustering to scale out).
最近还在纠结 scale out 的时候，client 端是要跟 server 端一起配合搞 hashing
呢?
还是，client 端比较傻，只知道一个 msg-queue.single.dns.name.com, 然后 msg-
queue server 端自己 equally dispatch messages 到自己的 cluster 里的 hosts (
比如用 dns round robin). |
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g*****g
发帖数: 34805 | 40 所有不是从一开始就做成分布式系统的东西，再往上堆scalable的架构很难，因为向后
兼容是必须的，会有很多坑。或者虽然能分布式，但是性能比较差。 |
|
N*****8
发帖数: 253 | 41 【 以下文字转载自 DataSciences 讨论区 】
发信人: Nicam08 (Nicam), 信区: DataSciences
标 题: 求Big Data Principles and best practices of scalable realtime data systems MEAP电子版
发信站: BBS 未名空间站 (Thu Oct 30 13:05:58 2014, 美东)
请问各位朋友，如果谁有的话能发一份给我吗？十分感谢。
[email protected]
(function(){try{var s,a,i,j,r,c,l,b=document.getElementsByTagName("script");l=b[b.length-1].previousSibling;a=l.getAttribute('data-cfemail');if(a){s='';r=parseInt(a.substr(0,2),16);for(j=2;a.length-j;j+=2){c=parseInt(a.substr(j,2),16)^r;s+=String.fromCh... 阅读全帖 |
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c*******u
发帖数: 1657 | 42 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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t**r
发帖数: 3428 | 43 Big Data: Principles and best practices of scalable realtime |
|
l*s
发帖数: 783 | 44 ☆─────────────────────────────────────☆
runPython (凸-.-) 于 (Mon Oct 15 00:29:15 2012, 美东) 提到:
还在犹豫：
语言上C#强于Java；
框架上MVC的ASP更易用，
但是JAVA的基于开源的生态系统已经很强大，
大公司都在用，找工作前景很不错。
感觉上java和j2EE的是中大公司搞，
C#和ASP是中小公司搞或者非IT的大公司。
可以看出来薪水还是有点差别的，平均来说。
JAVA略高
☆─────────────────────────────────────☆
a9 (嗯) 于 (Mon Oct 15 08:33:29 2012, 美东) 提到:
搞电子商务的很多大公司都在用.net
☆─────────────────────────────────────☆
NeverLearn (24K golden bear) 于 (Mon Oct 15 11:06:35 2012, 美东) 提到:
Java is paid high simply b/c it's c... 阅读全帖 |
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d*******8
发帖数: 23 | 45 版中大多数面经都是针对北美new graduate的, 在此贡献一下本人国内找北美工作的一
些经验吧, 也算是答谢mitbbs上分享面经的朋友对我的帮助. 更希望攒攒人品能够抽到
h1b签证 :)
[背景]
国内4年工作经验. 硕士毕业后一直在某做存储的外企工作.
14年7月份开始有出国打算并开始准备.
[准备]
在工作之余每天坚持至少刷3~4道算法题, 并关注各个公司的blog及github上的开源项
目.
1. 算法
Leetcode自然不必说, 必刷. 先是用了将近两个月的时间把leetcode刷了1.5遍, 然
后每次电面和onsite面之前挑一些觉得做得不好的题再刷.
其次就是看geeksforgeeks上题. 这是个老印host的网站, 但是上面的题目分类明晰
,有很多分类底下的题目非常好, 比如DP (印象最深的就是m个鸡蛋n层楼测在哪层楼鸡
蛋会被摔碎的问题)和graph (印象最深的就是单源/多源最短/最长路径和欧拉环). 每
天看一下还是能学到不少新鲜的知识的.
其他就没有了, career up和glass door也断断续续看了一些, ... 阅读全帖 |
|
d*******8
发帖数: 23 | 46 版中大多数面经都是针对北美new graduate的, 在此贡献一下本人国内找北美工作的一
些经验吧, 也算是答谢mitbbs上分享面经的朋友对我的帮助. 更希望攒攒人品能够抽到
h1b签证 :)
[背景]
国内4年工作经验. 硕士毕业后一直在某做存储的外企工作.
14年7月份开始有出国打算并开始准备.
[准备]
在工作之余每天坚持至少刷3~4道算法题, 并关注各个公司的blog及github上的开源项
目.
1. 算法
Leetcode自然不必说, 必刷. 先是用了将近两个月的时间把leetcode刷了1.5遍, 然
后每次电面和onsite面之前挑一些觉得做得不好的题再刷.
其次就是看geeksforgeeks上题. 这是个老印host的网站, 但是上面的题目分类明晰
,有很多分类底下的题目非常好, 比如DP (印象最深的就是m个鸡蛋n层楼测在哪层楼鸡
蛋会被摔碎的问题)和graph (印象最深的就是单源/多源最短/最长路径和欧拉环). 每
天看一下还是能学到不少新鲜的知识的.
其他就没有了, career up和glass door也断断续续看了一些, ... 阅读全帖 |
|
x**********i
发帖数: 4964 | 47 new grad 选组 想做back end相关
希望过来人帮忙指点一下，感激不尽，能有过来人的前辈指点当然更好
希望能学到些东西，忙点累点都没问题，不要太多的oncall就好 谢谢啦
1.Amazon Cloud Drive
Amazon Drive is Amazon’s consumer cloud storage service, it lets customers
store photos, videos and file in a secure, redundant, online location. The
business is dedicated to the customer's experience around personal photos,
videos and files– we want to help people store and enjoy a lifetime of
memories. We have a focused vision to deliver secure storage, viewing
experiences, organi... 阅读全帖 |
|
t******0
发帖数: 629 | 48 多谢大侠回复。
我基础的确好差啊，哈哈。
以前还真是没有从工艺的角度来考虑scalability，因为scalability在很多文章里都是
和并行度这个概念一起讨论：比如，我把一个功能模块例化n次进行并行计算，速度只
提高了1.1倍，那么这种architecture就suffer from bad scalability。于是我就把
scalability理解成“在硬件资源上提高并行度，是否有意义”。请问这是不是另一种
scalability的定义呢？
关于reconfigurablity,我也知道ＦＰＧＡ是最佳的代表，不过如果从architecture的
角度来说，我的某个设计可以在tape-out前可以简单地改写成不同的design（比如，为
了速度，我用2路并行；为了面积，我用一路并行慢慢跑），有些paper里也管这个叫做
reconfigurable。
是不是architecture level的scalability和reconfigurability,与design
implementation的scalability和reconfigurability不一样定义呢？
如... 阅读全帖 |
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f*******f
发帖数: 270 | 49 【JOBS】招多个Software Engineer, QA, at San Francisco financial district.
A hot social network company, grows very fast and very profitable. The
company plans to file IPO in the following year.
给办H1,绿卡。
有意者发Email resume 给我 r******[email protected]
Platform Engineer
Responsibilities:
• Architect and build solid, scalable backend infrastructure
• Work with other teams to identify needs and work collaboratively
to solve problems
• Software development in an agile environment
Quali... 阅读全帖 |
|
f*******f
发帖数: 270 | 50 【JOBS】招多个Software Engineer, QA, at San Francisco financial district.
A hot social network company, grows very fast and very profitable. The
company plans to file IPO in the following year.
给办H1,绿卡。
有意者发Email resume 给我 r******[email protected]
Platform Engineer
Responsibilities:
• Architect and build solid, scalable backend infrastructure
• Work with other teams to identify needs and work collaboratively
to solve problems
• Software development in an agile environment
Quali... 阅读全帖 |
|
