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Analysis on Linux PAE of kernel memory management The early Intel processors used 32-bit physical addresses from 80386 to Pentium, which theoretically allowed access to 4GB of RAM. However, large servers require more than 4GB of RAM to run thousands of processes at the same time, and in recent years this has been stressful for Intel, so it must extend the RAM capacity supported by 32-bit 80x86. Intel has met these requirements by increasing the number of pins from 32 to 36 on its processors, an

Spanning Tree PVST +) instances. Supports super multicast management for hardware IGMP listening. Supports dynamic VLANs that are to be used in the future. VTP pruning plan for future use ). QoS Data frames can be reclassified Based on the 802.1 p CoS value or the default CoS value specified by the network administrator for each port. On the hardware, each output port supports four queues. The WRR queue algorithm ensures that low-priority ports are not ignored. Strict priority settings

At present, I want to create a mobile version of the mall. This problem occurs when designing the database .. for example, a dress has red, white, blue, red, X, XL, and XLL sizes. White, S, M, X, XL, Blue, M, X, XL has never been satisfied with the database designed by myself. I hope all the ways are great... at present, I want to create a mobile version of the m

Topic linksSimple three-point set of three points, precision requirements are not high, casual play ...1#include 2#include 3#include 4#include 5#include 6#include string>7#include 8#include 9#include Ten#include One#include A#include Set> - #defineRre (i,r,l) for (int i= (r); i>= (l); i--) - #defineRe (I,L,R) for (int i= (l); i the #defineClear (A, B) memset (A,b,sizeof (a)) - #defineInOut (x) printf ("%d", (x)) - #defineDouin (x) scanf ("%lf", x) - #defineStrin (x) scanf ("%s", (x)) + #define

variables and internal variables to have the same name in the same source file. Within the scope of the internal variable, the external variable is blocked and does not work. (3) The scope of external variables is from the definition point to the end of this file. If the function before defining a vertex needs to reference these external variables, you must describe the referenced external variables in the function. The external variables are described as follows: Extern data type external vari

-mkconfig-o/etc/grub2.cfgPossible errors and solutionsAfter the restart, select CentOS Linux, with Linux 3.15.4 Xen to enter the Xen system, and use the xl info command to find the error. This is because the Xen-related software library is installed in the/usr/local/lib directory, the system cannot be found. So you can do some links:# Xl infoXl: error while loading shared libraries: libxlutil. so.4.3: canno

, Output) = Commands.getstatusoutput (' Cat/proc/cpuinfo ')>>> Print Outputprocessor:0Vendor_id:authenticamdCPU family:21... ...>>> Print Status0Note 1: The return value returned by using this method under Unix-like systems (status) is not equal to the return value after execution of the script or command, because the reason for calling Os.wait () is to understand the implementation of the system wait (). You need the correct return value (status), just move the return value to the right 8-bit o

PHP scenario, you need to convert the array to a JSON string, you need to use PHP's own json_encode function;But when the array contains Chinese strings, the result of the transfer is the following:1PHP2 3 $TMPARR=Array(4' Name ' = ' trousers ',5' Color ' = ' blue ',6' Size ' = ' XL ',7' title ' and ' Aged mens trousers '8 );9 Ten $tmpJson= Json_encode ($TMPARR); One A Echo $tmpJson;Output: {"name": "\u957f\u88e4", "Color": "Blue", "S

statement is actually a subquery. To demonstrate the use of subqueries in the WHERE clause, assume that you need to display a Sales.SalesOrderDetail record that contains the purchase of a oversized long sleeve logo sweatshirt. The code in Listing 3 satisfies my display requirements by using subqueries. SELECT * FROM [Sales]. [SalesOrderDetail] WHERE ProductID = (SELECT ProductID from [Production]. [Product] WHERE Name = ' Long-sleeve Logo Jersey, XL

This question and a CF on the "Z" of the problem is similar to the scan line + tree-like arrayStart scanning from the top right corner of the main diagonal, sweep to the lower left, each update, the right extension is equal to the point of the scan line, notice in its tree-like array update is goodTime complexity O (N^2LOGN)#include #include#include#include#includeSet>#include#include#include#includestring.h>#includestring>using namespaceStd;typedefLong LongLL;ConstLL mod=1e8+7;Const intn=1e3+5;

Python xlrd, a common method for reading excel, pythonxlrd I watched a video on excel operations by the old K. I am very grateful to the old K for sharing it! To install the xlrd module, open cmd and enter the command: pip install xlrd to install it. If it has been installed, it is shown as follows: You can use the following methods to read excel files from xlrd: ''' 1. open the file ''' xl = xlrd. open_workbook (file) ''' 2. Obtain sheet ''' prin

//1. Simple monomer Modevar singleton={Attr1:true,Attr2:10,method1:function () {alert ("Method One"); },method2:function () {alert ("Method two"); } };//Monomer mode partition namespace (differentiate code)var xl={};//create your own namespaceXL. singleton2={Attr1:true,Attr2:10,method1:function () {alert ("Method One"); },method2:function () {alert ("Method two"); } };XL. Singleton2.method1 ();//2. Using cl

Use php to generate an excel file 1. use php to generate an excel file to describe its principles: The document directory components in excel2007 are: 3. the code is as follows: Open ('. /01.xlsx ', ZIPARCHIVE: CREATE); // 3. create an excel file (file directory and xml file) $ ex-> addFromString ('[Content_Types]. XML '," "); $ Ex-> addFromString ('_ rels/. rels '," "); $ Ex-> addFromString ('docprops/app. XML '," "); $ Ex-> addFromString ('docprops/core. XML '," "); $ Ex-> addFromStrin

length is (n-k) the interval to find the difference between the maximum and the minimum difference (= =), and then da lei to find the smallest.Since we can prove that the optimal sequence after the deletion of the element is sequential, it must be sequential, so only the enumeration is required. (Proof slightly)But at the end of the interval the minimum difference is to use the multiplier St algorithm, otherwise it will time out ...The code is as follows (style ugly don't mind)#include #include

), min (W1, W2) ≤ min (max (x1, x2), max (W1, W2 ))(Assume that the line segments and windows are arranged from left to right, which can be abbreviated as Max (x1, W1) ≤ min (X2, W2), that is Line Segments and Windows: medium to large at the left endpoint ≤ small at the right endpoint　 2d Cropping The essence of the Two-dimensional cropping algorithm is how to turn the two-dimensional cropping problem into a secondary one-dimensional cropping.The two-dimensional window i

process is:Key_pbox [0] = pbox [0] ^ abcdefghKey_pbox [1] = pbox [1] ^ ijklmnab........................Wait until the key_box is filled.3) Use bf_en to encrypt a 64-bit information of 0, and replace key_pbox [0] And key_pbox [1] With the output result. I = 04) Replace the key_pbox [I], key_pbox [I + 1] After bf_en encryption, replace key_pbox [I + 2] And key_pbox [I + 3] With the output5) I + 2, continue step 1 until all key_pbox is replaced6) Use key_pbox [16] And key_pbox [17] For the first i

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translationsOf linear addresses. EPT defines a layer of address translation that augments the translation of linear addresses. 28.1 virtual processor Identifiers (vpids) Vmcs-> VM-EXECUTION control fields-> vpidThe current vpid is 0000 h in the following situations:-Outside vmx operation.-In vmx root operation.-In vmx non-root operation when the "enable vpid" VM-execution control is 0.28.2 The Extended page table Mechanic (EPT) Some GLA are directly translated as HPA rather than GPa (GPA is tra

bus is 64-Bit Width, each time can transmit 8 bytes of data at the same time. Therefore, the low three-digit address line is omitted. Take the Pentium 4 CPU as an example. Its address line is a [35: 3] #. That is to say, when the CPU accesses the memory, it always gives the front-end bus an address with a low 3-bit value of 0, which actually plays the function of alignment the address by 8 bytes. The PAE feature is the first generation of the P6 processor, introduced by Pentium Pro (see softw

updated in the operating system, you need to manually update TLB to make the new ing take effect. For example, the virtual address 0x11111111 in the page table and TLB is mapped to the physical address 0x22222222.OS updates the page table so that the virtual address 0x11111111 is mapped to the physical address 0x33333333. If the corresponding flush TLB command (invlpg, write 303, note that x86 does not allow explicit modification of TLB content, and only one or more of them can be cleared.) The