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Linux Operations Learning Notes-Document System Knowledge System Summary

data).File properties:Inode Summary:1. A certain number of inode and block will be generated when the disk is partitioned and formatted as a EXT4 file system2. The inode becomes an index node, which is used to store the file's attribute information as well as the index of the file (the entity that points to the file).3, EXT3/4 file system block storage is the actual contents of the file.4, Inode is a piece of storage space on disk, C6 non-boot area inode default size 256 bytes, C5 is 128 bytes.

Cross-platform network library (with C + + 11)

few CPP files bar, there are several header files in the root directory of the/common and/cpp_common directories).(g++-I.. /.. /.. /common-i. /.. /.. /cpp_common eventloop.cpp datasocket.cpp TCPServer.cpp main.cpp-std=c++0x-lrt)TODO:: There's some todo in the code that means obscure or I'm not sure it's okay ~hohoAnd I'm looking forward to the next broadcast test (like the MMO Aoi, where multiple players move simultaneously to broadcast to n players around).Currently Ping pong test (client and

On the Linux file properties

of a file. EXT3/EXT4 file system, a file must occupy at least one inode and one block. (file size is larger) EXT3/EXT4 file system, normally a file is occupied and can only occupy one inode (person and ID number) Blocks are used to store actual data, and each block is typically 1k,2k,4k in size. The boot partition is 1k, and the other normal partitions are 4K (CentOS6) If a file is large (h

Linux0.11 kernel--memory management 2. With fork

longget_free_page (void) {Register unsigned long __res asm ("Ax"); __asm__ ("STD; Repne; Scasb\n\t "//direction position bit, compares Al (0) with the corresponding (DI) content of each page," jne 1f\n\t "//If there is no byte equal to 0, the jump ends (returns 0). "Movb $1,1 (%%edi) \n\t"//will correspond to the memory image location of the page 1. "Sall $12,%%ecx\n\t"//number of pages *4k = relative page start address. "Addl%2,%%ecx\n\t"//P

What are Android 6.0 new features

interface, new power management will better support the Type-c interface.Other:1. Support 4K DisplayWhile mobile phones with Android 6.0, such as Nexus 6P and 5X, are not equipped with a native 4K resolution screen, in fact the Android 6.0 itself already supports the 4K display, making the 4K content clearer by some f

About the use of w25q256 under EFM32

) >>24)); Send 32bit address Spi1_readwritebyte ((U8) ((READADDR) >>16)); Spi1_readwritebyte ((U8) ((READADDR) >>8)); Spi1_readwritebyte ((U8) readaddr); for (i=0;i The Spiflash write function of the Atom has a 4k area erase function, which is convenient to use. Now the company requires management w25q256, write 1 frames per second after the resolution of the GPS data, power down from the last written address continue to write. I tent

Four client-side Web storage solutions with the ability to replace cookies

There are several existing standards that are required to store large amounts of data in a user's Web browser, each with its own advantages, short board, unique standardization status, and browser support levels. However, the actual performance of these standards is superior to the widespread existence of the cookie mechanism.Today's Web applications start doing a lot of data processing in the client and may even need to complete the task offline. It can be said that client-side data storage pla

The difference between functional cookies, sessionstorage, and Localstorage in PHP

browser will be erased when it is closed;Localstorage is permanently present unless it is cleared;(2) Capacity:Cookies have a small capacity of about 4k,Sessionstorage and localstorage capacity of about 4M; The difference between Sessionstorage and localstorage Sessionstorage is used to store data locally in a session, which can only be accessed by a page in the same session and destroyed when the session ends. So sessionstorage is not a persistent l

Reproduced Page catalogs in the Win7

QQExternal.exe defd1020 osppsvc. EXE defd1080 DctSer.exeDefd10e0 Windbg.exedefd1100 WmiApSrv.exedefd1120 YodaoDict.exedefd1140 Chrome.exedefd1160 WordBook.exedefd1180 Chrome.exeDEFD11A0 Windbg.exeDEFD11E0 Audiodg.exedefd1200 Taskeng.exe from the output results, Dirbase's address is divided into 3 blocks,1.185000 SystemThis process is always special and uses a 4K page to store the pages directory. 0:kd>!vtop 0 80185000 X86vtop:virt 80185000, Pagedir d

Four client-side Web storage solutions with the ability to replace cookies

There are several existing standards that are required to store large amounts of data in a user's Web browser, each with its own advantages, short board, unique standardization status, and browser support levels. However, the actual performance of these standards is superior to the widespread existence of the cookie mechanism.Today's Web applications start doing a lot of data processing in the client and may even need to complete the task offline. It can be said that client-side data storage pla

Memory management of operating system (II)

1 The concept of fragmentation is already in front of it, so why are there pagination?This is to improve memory partition caused by memory efficiency problems, when the program is reproduced in memory, we know that the program is staged loading, through the memory partition to load different segments. So if there is the following problem, I now need to request a space of 160k, and my total free space is greater than 160k, but no free partition is greater than 160k, then according to the manageme

Le AV 4.14 hardware free day de user experience

, though.In order to verify the problem of the screen, I found a local lepar experience shop, see the X65 screen effect feel can also, no obvious color, backlight uneven situation, of course, the experience shop lighting environment is good, and the TV is not activated without screen test software testing conditions. Lepar experience picture below, the biggest one is X65.So stay up to the early morning of April 14, the success of the order to buy a X65, after 4799 discount, package parcel post i

Nginx Compressed Output configuration

compression instructions. The relevant instructions for gzip compression output are located in http{...} Between the two curly braces:gzip on;Gzip_min_length 1k;Gzip_buffers 4 16k;Gzip_http_version 1.1;Gzip_comp_level 2;Gzip_types text/plain application/x-javascript text/css application/xml;directive meaning: GZIP Instructions:Syntax: gzip On|offDefault value: gzip offInstructions are used to turn the Gzip module on or off. Gzip_buffers directive:Syntax: gzip_buffers number SizeDefault va

Logical address, physical address, linear address

manner.Second, the linear address to the physical addressThe previous said that the logical address in Linux is equal to the linear address, then the linear address how to correspond to the physical address? As we all know, it is through the paging mechanism, specifically, is through the page table lookup to correspond to the physical address.The exact paging is a mechanism provided by the CPU, and Linux is using it to implement memory management only according to the rules of this mechanism.In

Buy Something Now! Military parade Front-line command car with the price of a big promotion

On the eve of the 9.3 parade, the Best Buy point for curved TV has appeared. Now you can take home a top-of-the-art curved TV with just over 7,000.In order to let the Chinese people at home to see like in person at the scene of the military parade, Tcl from August onwards in the country's major TCL stores held "big military parade big strength--TCL curved surface Parade Exclusive action" large-scale theme promotional activities, price war re-upgrade. Parade before the car and flag escort team wi

About/dev/null and/dev/zero file details, as well as the solution of mis-deletion/dev/null and/dev/zero and the method of disk IO test using/dev/zero

as follows:Pick up the Sky stars, a love of Internet art people! Email:[email protected][[email protected] zhaiqutianshangxing]# dd If=/dev/zero of=test bs=64k count=4k Oflag=dsyncDD: Opening "/dev/zero": No file or directoryThe resolution of/dev/zero file by mistake Delete the following two commands to repair the rebuild file: [[email protected] zhaiqutianshangxing]# Mknod/dev/zero C 1 5[Email protected] zhaiqutianshangxing]# chmod 666/dev/zeroAfter

TQ2440 Learning notes--7, NOR Flash and NAND Flash

Maximum erase count 10.01 billion times Driver support is required if you need to run code on the NAND device. Under Linux is also the memory technology driver MTD4. TQ2440 nor Flash and NAND flash startupDevelopment Board in the case of bare metal is equivalent to direct operation of single-chip microcomputer, no operating system, into the operating system needs to be burned into: Boot program bootloader, kernel kernel, file system.Bootloader is where the CPU

URL length limit in HTTP (data pack)

accepts for one client request at a time. This header includes not only the request-line, but also the general information header, the Request header field, and the length sum of the response header fields. This also limits the length of the URL to a considerable extent. Nginx Server default limit is 4K or 8K, which is based on the hardware configuration of the server, usually the size of the memory page, the majority of the current is

Linux Shell Basics (vii)

file type directory../subdir   /> Find.!-type D#在当前目录下, find files of a file type that are not directories../users2./datafile3./users./test.tar.bz2/> Find-type f#在当前目录下, find files of file type file./users2./datafile3./users./test.tar.bz29. Search by file Size:-size [+/-]100[c/k/m/g]:Represents a file with a length equal to [greater than/less than] 100 blocks [byte/k/m/g].-empty:Find an empty file./> Find-size +4k-exec ls-l {} \;#查找文件大小大于

Follow Mr. Wei to learn Linux learning Notes (ii)-Storage Manager

initial access address of SDRAM is 0x300000003 . Text4 . Global _start5 _start:6 BL Disable_watch_dog @ off watchdog, otherwise the CPU will continue to restart7 BL Memsetup @ set up storage controller8 bl copy_steppingstone_to_sdram @ copy code into SDRAM9 Ldr pc, =on_sdram @ jump to SDRAM continue executionTen On_sdram: One Ldr sp, =0x34000000 @ sets the stack, because the program is copied to the SDRAM inside the run, the stack space is set to the first

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