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Linux kernel parameters in a detailed

writing dirty pages to swap space (so)The decreasing value of 3.buff means that KSWAPD is constantly recovering memory Reference articles Those things of TCP (http://coolshell.cn/articles/11564.html) Communication System Experience (http://maoyidao.iteye.com/blog/1744309) Http://www.quora.com/Whats-orphaned-sockets-and-how-can-I-prevent-them http://blog.csdn.net/russell_tao/article/details/18711023 http://www.speedguide.

78 golden rules for Java programming

. Returns an array or set of 0 lengths, not NULL44. Write documentation comments for all exported API elementsGeneral Programming45. Minimizing the scope of local variables46. The For-each cycle takes precedence over the traditional for loop, [why the For loop is hateful] http://justjavac.com/other/2012/05/15/whats-wrong-with-the-for-loop.html47. Understanding and using class libraries48. If precise answers are required, avoid using float and double49

Garbage collectors–serial vs. Parallel vs. CMS vs. G1 (and what's new in Java 8)

Transferred from: http://blog.takipi.com/garbage-collectors-serial-vs-parallel-vs-cms-vs-the-g1-and-whats-new-in-java-8/?utm_ Source=blogutm_medium=in-postutm_content=gcmisconceptionsutm_campaign=javaThe 4 Java garbage collectors–how the wrong Choice dramatically impacts performanceThe year is, and there is, things that still remain a mystery to most developers–garbage collection and Understa Nding the opposite sex. Since I don ' t know much about the

The role of Spring Data JPA.

implements the JPA specification, switching between different ORM frameworks still requires writing different code (business code for the Repository/dao layer), while using spring data JPA allows you to switch between different ORM frameworks without changing the code. And spring data JPA is a good package for the repository layer, and it saves a lot of hassle.In the actual project, it is recommended to use Spring Data JPA + ORM (e.g. Hibernate) for development, which provides a way to switch b

Python Learning Notes (iv) Python object types and their operations

[38]:str3= "Whatsyouname" #将字符穿转换列表 (list) type in[39]:l1= List (STR3) in[40]:printl1[' W ', ' h ', ' a ', ' t ', ' s ', ' ', ' Y ', ' o ', ' u ', ' ', ' n ', ' a ', ' m ', ' e ']in[41]:str4= ' whats thefuck "#将字符串转换为元组In [42]:t1=tuple (STR4) in[44]:printt1 (' W ', ' h ', ' a ', ' t ', ' s ', ' ', ' t ', ' h ', ' e ', ' ', ' f ', ' u ', ' C ', ' K ') #将字符串转换成集合In [45]:printstr4whatsthefuckin[46]:s1= Set (STR4) In[47]:prints1set ([' A ', ' ', '

Some tips for viewing element event functions in JavaScript

describes the difference between this method and Jquery.data, address http://stackoverflow.com/questions/7788353/ Whats-the-difference-between-jquery-data-and-jquery-data-underscore-data.Here, we just need to know that this method can be used to achieve our purpose-to see what events the element is bound to. We just need to enter the following code in the Chrome console:$._data ($ ("#btn1") [0], ' events ');Note that the parameter of the method is a

What's that NetScaler Reset Packet?

What's that NetScaler Reset Packet?https://www.citrix.com/blogs/2014/05/20/whats-that-netscaler-reset-packet/A few weeks ago I wrote a blog post on what to empower and extend your default Wireshark configuration titled NetScaler + WIreshark = A Perfect combination! I ' d like-to-follow up-that-post with this article which focuses on what to interpret some of the the data so you could see in a NetScaler Trace.The TCP Reset [RST]Quick Tip:if want a gene

The application of MVP model in Android development _android

patterns, partly because they may not be able to distinguish between the two patterns. (Reference article: http://www.infragistics.com/community/blogs/todd_snyder/archive/2007/10/17/ mvc-or-mvp-pattern-whats-the-difference.aspx) MVP mode: View does not interact directly with the model, but interacts with the model indirectly by interacting with the presenter The interaction between presenter and view is done through interfaces and is more

IMG element Loading behavior detailed

load failure. N/A Delay is 1~2ms 1. No request for resources will be initiated;2. If the IMG element is in the render tree, show the schematic of the load failure. N/A Delay 0~1MS N/A 1. No request for resources will be initiated;2. If the IMG element is in the render tree, show the schematic of the load failure. According to the above statistics, in Chrome, FF and IE in the same behavior is loaded invalid Datauri Scheme. The delay is also relatively short a

The difference between STATIC_RNN and DYNAMIC_RNN

recently, looking at the API interface of TensorFlow, we found that there are two kinds of RNN interface in TensorFlow, the first one is static RNN, the other is dynamic RNN, these two kinds of difference check some data: https:// Stackoverflow.com/questions/39734146/whats-the-difference-between-tensorflow-dynamic-rnn-and-rnn It is more clear that the original text is as follows: TF.NN.RNN creates a unrolled graph for a fixed rnn length. That means,

Nginx + php-fpm Connection refused problem

Use the Yum installed PHP-FPM, always throw the wrong time: Connect () failed (111:connection refused) while connecting to upstream, client:127.0.0.1, Server:localhost Appears to be nginx not even to PHP-FPM, find to find out, found is the problem of PHP-FPM configuration: Open PHP-FPM configuration file:/etc/php-fpm.d/www.conf, Find Listen =/run/php-fpm/www.sock, Because the Nginx is a match: Location ~ \.php (. *) $ { fastcgi_pass 127.0.0.1:9000;

What is the difference between an instance name and a database name in a database? __ Database

If you have used the database, then the connection to the database configuration will not be unfamiliar, whether you are using a mature framework and your own use of JDBC implementation, can not escape that several important information, but there is an important configuration, I used to have been so-so, superficial understanding, But this kind of thing encounters many to feel very afflictive, therefore decided to solve this problem today. The following article is for SQL Server databases only:

Case study: Thinking-oriented quiz class platform Quora

important, it is like to call "cloud quiz" will not make them more successful. 5, the door to suppress Facebook has set out to develop its own question and answer platform, just as Google has developed a group purchase. Fortunately, users are always attracted to the quality of the site, and temperament can not copy and paste, can not be achieved in one go: This can be for their own development barriers to win enough time. Resources What's the difference between Quora and Yahoo Q-Quo

Nagios+cacti+nrpe+nconf consolidate the final error resolution steps

problems is encountered while processing the config files ... Check your configuration file (s) to ensure that they contain valid directives and data defintions. If you are are upgrading from a previous Version of Nagios, you should being aware that some variables/definitions may have been removed or modified into this version. Make sure to read The HTML documentation regarding the config files, as the ' Whats New ' what has changed. Deploymen

Remember the exception resolution in spring boot in MongoDB prematurely reached end of stream

) at org.springframework.data.mongodb.core.MongoTemplate$FindOneCallback.doInCollection(MongoTemplate.java:2197) at org.springframework.data.mongodb.core.MongoTemplate$FindOneCallback.doInCollection(MongoTemplate.java:2181) at org.springframework.data.mongodb.core.MongoTemplate.executeFindOneInternal(MongoTemplate.java:1925) ... 12 more Online search, the problem is a lot of reasons, the main reason may have a connection timeout, read and write timeout, acc

Git pull and git pull--rebase

The default behavior of git pull is git fetch + git merge, Git pull--rebase is git fetch + git rebase. For the purpose, there is no difference, and after running, you can get the same code base. However, from a version management perspective, these two have their own use of meaning. Git merge: Simply put, it merges all the commits of two different branch histories into one line and a knot at "end" that generates a merge commit. Finally, a single submission line is formed. Git rebase: Depen

New features of ES2018 (ES9)

Original link: www.sitepoint.com/es2018-whats-new/In this article, I'll cover the new features of JavaScript introduced through ES2018 (ES9), as well as examples of what they do and how they are used. JavaScript (ECMAScript) is a constantly evolving standard that is implemented by many vendors on multiple platforms. ES6 (ECMAScript 2015) is a large version that took six years to complete. The new annual release process has been developed to streamline

Go: Training set (train set) validation set (validation set) test set

Toolbox was for avoiding overfitting. In this situation the weights is specified for the training data only and don ' t show the global trend. By have a validation set, the iterations is adaptable to where decreases in the training data error cause decreases in Validation data and increases in validation data error; Along with decreases in training data error, this demonstrates the overfitting phenomenon. Http://blog.sciencenet.cn/blog-397960-666113.html Http://stackoverflow.com/questions/29764

Grid Infrastructure single Client Access Name (SCAN) explained (document ID 887522.1)

Label:Applies To:Oracle database-enterprise edition-version 11.2.0.1 and laterExalogic Elastic Cloud x4-2 half RackInformation in this document applies to any platform.PURPOSE11gR2 Grid Infrastructure (CRS) introduced single client Access Name (SCAN) to simplify Client access to database services , this article was going to explain whats SCAN and how it works.SCOPEIntended audience'll be DBAs who's installing/upgrading to 11gR2 Grid Infrastructure or

VS2017 assembly Reference error occurred while generating SQL Server 2017 project

Tags: support managed rust issue Certificate option Whitelist build TPSone, when using vs2017 to generate SQL Server 2017 project, because of the added assembly (CLR integration, you can refer to the following links to understand), the following issues are raised because the security permissions are configured incorrectly: SQL72014:. Net SqlClient Data provider:msg 10343, Level 1, and Line 1 for assembly "XXX" with SAFE or external_access option The CREATE or ALTER ASSEMBLY failed because the sp

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