Copyright notice: This article by Hangyuan Li original article, reprint please indicate source:Article original link: https://www.qcloud.com/community/article/109Source: Tengyun https://www.qcloud.com/communityThe purpose of this article is to share some of the benefits of analyzing Shell's source code at school, to help you understand a shell's workflow, and to look at some of the design advantages and drawbacks of a long-standing software like the shell from a software design standpoint. This
the evolution process of large Web site system architecture from stand-alone to billion-level traffic
Stage One, stand-alone build Web site
At the beginning of the site, we often run all our programs and software on a single machine. At this point we use a container, such as Tomcat, Jetty, Jboos, and then use the Jsp/servlet technology directly, or use some open source frameworks such as Maven+spring+stru
, the definition of the global variable in the. h file is either static, and each compilation unit is used in its own. Either the extern declaration, I'm going to use a global variable, and if the definition is not found, find it in the other compilation unit. If you define a variable in the. h file, it is unreasonable that the. h file may be a multiple compilation unit include, which is bound to occur when the variable is redefined. The linking process
Two-level domain name do station research has updated four topics, the first three general introduction of the two-level domain name to do the advantages and disadvantages of the station, as well as the general situation of operation optimization. This time I would like to talk about the project station on-line to optimize the whole process of operation, while co
ORA-00031-mark the session to terminate and kill the process at the OS level
Reporting when killing a processORA-00031-mark the session to terminateHowever, viewing the v $ session view still exists, but the status is changed to killed and is not actually killed.
In this case, we can kill the process from the operating system layer.
Steps:1. Search for the cor
init, and profile/etc/inittab and run level1, after the core loaded, hardware information This test and driver load, at this time your host hardware should be ready, at this time the core will be active to call the first user-level program, that is/sbin/init (init is known as all the ancestor process, is also the first user-level
= new file (PATH, md5util.md5 (URL). substring (0, 10));Bitmap Bitmap = Bitmapfactory.decodefile (File.getabsolutepath ());return bitmap;Network accessURL murl = new URL (URL);HttpURLConnection con = (httpurlconnection) murl.openconnection ();Con.setconnecttimeout (5000);//Set link time-outCon.setreadtimeout (5000);//Set Read timeout timeCon.connect ();//Link Network operationint code = Con.getresponsecode ();//Get Server response codeif (code = = 200) {Gets the server data, which is returned a
the field that is obtained after the list is submitted and understands that the bound data is hidden -Dropbrand.datasource =DT; - Dropbrand.databind (); -DropBrand.Items.Insert (0,NewListItem ("Please select a car brand",""));//add content to the first item, focusing on adding after binding +DropType.Items.Insert (0,NewListItem ("Please select car brand model",""));//add content to the first item, focusing on adding after binding - } + A protected voidDropbrand_selectedindexcha
Zookeeper
-- How to view memory consumption of a single process at the OS level
AIX:
$ Svmon-Pt10 | perl-e 'while (-------------------------------------------------------------------------------Pid Command Inuse Pin Pgsp Virtual 64-bit Mthrd 16 MB5111942 svmon 22446 8768 0 22370 Y N4391128 ksh 18298 8724 0 18232 N5308430 perl5.8.8 18262 8724 0 18245 N
AIX: (available in linux)$ Ps gvPid tty stat time pgin
placed in the page table when a page is used (page faults are interrupted or allocated). Obviously, the logical page numbers in the page table are not contiguous, and each row in the page table has a physical page number and a logical page number.
Page Table page: The space allocation of the page table itself is also in pages. The different page table pages of a Process page table are not necessarily contiguous.
for initialization include:1, Secretmanager:delegationtokensecretmanager case, Mr Safety management related classes;2, aclsmanager:aclsmanager instance, job level and queue level management and access control;3, the Taskscheduler:taskscheduler instance, the Scheduler object, the Hadoop default scheduler is the FIFO strategy Jobqueuetaskscheduler;4. Example of In
Hmailserver\addons to plugins under Squirlmail; settings Squirlmail configuration file, to install ActivePerl, so that click config\conf.pl can set the configuration, here, carefully set The configuration file, especially the path problem of option 4 for 1 and 2, is set to the path of your own machine.11 There are other systems, we'd better choose open source free, so there are better resources for us to learn. Copyright NOTICE: This article for Bo Master original article, without Bo Master pe
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2anticolisionAndSELECT2.1 Overview of commands
These two commands are used in the anti-collision process, and they collectively contain the following three parts:(1) Select Code (SEL), which takes up one byte.(2) Valid byte (NVB), which takes up
.
0xc400 0000 to 0 xdfff FFFF
This range is user-defined static virtual address space, but this address space can only be used for non-buffering.After defining the physical address ing space using oemaddresstable, this range does not change every time the kernel is started, unless the physical memory capacity of the product changes. If the physical memory is increased to MB, the physical address ing space is also doubled. Windows CE. Net also allows users to create static physica
The vast majority of people are familiar with high-level frameworks such as WebForms and WebServices, which are at the highest level in the ASP.net hierarchy.
This article is compiled from a variety of Microsoft-exposed documents, by comparing the IIS5, IIS6, IIS7 of the three generations of IIS to the request process, let us familiarize ourselves with ASP. NET
Label: Soccer and Oracle Series (3): Oracle process ranking. The World Cup is about to be fought! Statement: This is not a technical document, since you have learned a few tricks of Oracle simple moves. Can not endure in front of people show off a few. Pure for the gossip and a few friends of the gag. Just for the ease with a hint of humor, it technology can also be used to ridicule, it is quite intriguin
an argument.Break statements and continue statements, and ELSE clauses in loopsThe break statement, like in C, is used to jump out of the nearest first level for or while loop.A loop can have an ELSE clause, which executes when the loop iterates through the entire list (for a) or when the execution condition is false (for the while), but the loop is not executed when the break is aborted. The following example program for searching prime numbers demo
The vast majority of people are familiar with high-level frameworks such as WebForms and WebServices, which are at the highest level in the ASP.net hierarchy.
This article is compiled from a variety of Microsoft-exposed documents, by comparing the IIS5, IIS6, IIS7 of the three generations of IIS to the request process, let us familiarize ourselves with ASP. NET
Football and oracle series (3): oracle process rankings, the World Cup round is about to fight!
Statement:
This is not a technical document. Since I have learned a few tricks about oracle, I cannot afford to sell it to anyone. Just after a meal, I joined several friends in the library. It is just a bit humorous and it can also be used to make fun of others.
At the same time, I have forgotten a lot of oracl
C # process automatic report generation by Word. 3. design template,
Since it is a template, various tags and configurations are indispensable. The word bookmarks are mainly used here.
Press ctrl + shift + F5 to open the word bookmarks Function
For example
As shown in, you can select a region in word and press ctrl + shift + F5 to add a bookmarks for this section.
Is it understood that a pointer is added
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