how to open mmap file

Original: http://weibo.com/p/1001603830912709174661Write mmap memory and file generates hundreds of MS latency reasonApril 12, 2015 21:10 reading 4274 Recently saw a bug introduction, the author spent 4 months tracking location, found that the JVM statistics will cause the garbage collection process to pause good hundreds of Ms. The JVM statistics are written to a memory area that

Article Title: Linux mmap File Memory ing mechanism. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. When describing the concept of file ing, it is inevitable that virtual memory (S

*mmap(void*addr,size_tLen,intPort,intFlag,intfiledes, off_t off)return value: The mapped memory address was successfully returned, failed to returnmap_fialedParameters AddrThis is only in rare cases 0 , this parameter tells the kernel to use Addr specifies the value to map the specified file. When specified as 0 , tells the kernel what address to return within its own decision. It is always undesirable to s

/ * Use Mmap to operate the file * /#include #include #include #include #include #include #define FILELENGTHintMainvoid){intFD =-1;/ * The string that will be written to the file * / Charbuf[]="Quick brown fox jumps over the lazy dog";Char*ptr = NULL;/* Open the file mmap.t

void *mmap (void *addr, size_t length, int prot, int flags, int fd, off_t offset);function function: Map the contents of the file to a piece of memory (virtual memory), through the memory read and modify, to achieve the file read and modify.Parameter descriptionAddr: Specifies the starting address of the map, usually set to null (indicated by the system).Length:

MMAP can map a part of the disk file directly to the memory, so that the location in the file has a corresponding memory address, you can directly use pointers to read and write files without the need for the read/write function. Prototype: # include Void * MMAP (void * ADDR, size_t Len, int Prot, int flag, int fi

Disk-to-memory mapping is a file mapping, before we say the swap, because This problem makes me very easy to think of Swap,linux swap is the meaning of the swap partition, in the case of memory not enough, the operating system first put the memory and the swap area of the disk to "map", and then the these memory freed up into memory, For the subsequent process of freeing up a piece of memory space, wait until the own process is awakened again, then

Best references: 1. Master from the Internet. 2. UNP V2 posix ipc chapter 12. 3. Linux man command. Article 1: MMAP function Purpose 1. Map common files to the process memory space for memory ing Io. 2. Map special files to the process memory space for anonymous memory ing Io. 3. Map shm_open to open the POSIX shared memory zone to the memory space of the process, which can provide data sharing and I

How to click open file? How to quickly open a file and click Open File If you are an efficient person, you must not miss this article. Through this article, you will know how to open a

[img=http://] [/IMG] I installed the xampp on Ubuntu, just started ecshop normal operation, Come here some time, punch ecshop any page, prompts the File Download dialog box, is to save this file, or to find the program online to open this file? Web address ibmstyle.com This behavior occurs in other people's client

High score help How to set up XAMPP, now open the Web page, always prompt for file download, is to save this file, or to find a program online to open this file? [img=http://] [/IMG] I installed the xampp on Ubuntu, just started ecshop normal operation, Come here some time,

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How to set up xampp for high score help? when you open a webpage, you are always prompted to download the file. do you want to save the file or open the file through an online searching program? [Img = http: //] [/img] I installed xampp nbsp; on ubuntu. at the beginning, ec

NetBeans Utf-8 Encounter such a problem:A CSS file that can be determined to be saved in the Utf-8 format.On the one hand, this file was originally created from NetBeans and is now simply saved to the project as a separate file open. On the other hand, it has been verified with other editors. When you

High score help How to set up XAMPP, now open the Web page, always prompt for file download, is to save this file, or to find a program online to open this file?

How to open the php file and how to open the php file ?. How to open the php file ?, In fact, you do not need to open the php file. most of

Win7 How the system opens a CSV file |win7 the system opens the CSV file in two ways. recently many netizens asked the small Win7 system how to open the CSV file? A CSV format file (comma-delimited value) is a plain text file that

. Since Cin and cout are already defined in the iostream.h, the user does not need to define them. When disk files are used, they cannot be defined in advance because of different circumstances, and must be defined by the user. In addition, operations on disk files are implemented through file stream objects rather than CIN and cout. File stream objects are defined by the

How does a frame work? do you want to open or save the file? I can open it or cannot open it. he has saved lt; HTML gt; lt; HEAD gt; lt; TITLE gt; MyOffice homepage lt;/TITLE gt; lt; METAhttp-equiv = Content-Typecontent = quo? I clicked open or couldn't

Do you mean not to use the default software, but to use a different one?Right--Open mode--select program (Pop Up a dialog box with a list of many programs)If the list does not have the program you want to use, you can click BrowseFind the path to the software you wish to use and open the specified file with the software, note, such as Editplus.exe, is to browse o