Linux

[Root@rhel63single queue]# pwd/sys/block/sdj/queue [root@rhel63single queue]# LS-LRT | grep size-r--r--r--. 1 root root 4096 Aug 21:58 physical_block_size-r--r--r--. 1 root root 4096 Aug 21:58 optimal_io_size-r--r--r--. 1 root root 4096 Aug 21:58

Linux kernel ———— queues Linux kernel--queues Defined: struct __kfifo{ unsigned int in; The team is offset, write index unsigned int out; Out team offset, read index unsigned int mask; unsigned int esize; void *data; } Use: Creates a

one, Dead lock Four conditions that produce a deadlock(1) Mutually exclusive condition: A resource can only be used by one process at a time.(2) Request and retention conditions: a process that is blocked by requesting resources, retains the

1, download the package address (i downloaded is opencc-1.0.4.tar.gz): Https://bintray.com/package/files/byvoid/opencc/OpenCC 2, into the tar.gz directory, the command line decompression: TAR-XZVF opencc-1.0.4.tar.gz 3, compile (need tools CMake,

Since the Sunpinyin input method of Ubuntu is not easy to use, often appear all kinds of inexplicable letters and words. So want to change the input method to play, the result of the tragedy ~ in the landing interface infinite cycle, toss a night

Go to the official website download the http://www.lua.org/download.html source file version 5.2.1 To the local directory TAR-ZXVF lua-5.2.1-tar.gz; CD lua-5.2.1; Make Linux (compile in Linux environment); make install An error may be encountered

You wrote a command-line program called NB, and you want the tab to automatically list the prompts you want after bash enters NB spaces. Or you want to be able to list all the names of the machines you have permission to connect to by the Space

The concept of DTS, here is not much to say, My example here is OpenWrt DTS; the CPU is 7620; Here's Power_led's Gpio 44 First look at the right picture: There's a structural body called Gpio2, Gpio-base:gpio number of heads, base site The

The FQDN is the abbreviation for fully qualified domain name, meaning the full domain name. For example, a machine host name (hostname) is www, and domain suffix (field) is example.com, the FQDN of the host should be www.example.com. In addition,

1. Install Erlang First, install tutorial please see one. 2. To https://github.com/rabbitmq/rabbitmq-server/releases download the latest version, I downloaded is wget https://github.com/rabbitmq/

When you are working on Linux commands, the following words appear frequently 1 You have mail in/var/spool/mail/root This is a hint to have the latest mail, you can use mail command to read 1 2 3 4 5 6 7

The following learning notes are collated from "Docker Development Practice" http://www.ituring.com.cn/book/1631 Ubuntu Install Docker Fedora Install Docker Redhat install Docker verify Docker is installed successfully Ubuntu installation

Original address: http://www.linuxidc.com/Linux/2014-05/101572.htm Press the TAB key when the menu appears to enter the command input mode. Enter a space at the end of the command line that appears, and then enter Acpi=off, which can be installed

The main thing I think is the theory and the actual combination of methods to do, first of all, the theory of this piece in the operating system of the contents of the first statement. Then use the code under Linux to truly implement. Perterson

CRC is the cyclic redundancy check code: It is the most commonly used in the field of data communication error check code, which is characterized by the information field and check the length of the field can be arbitrarily selected.CRC Verification

Configuration prerequisite Nginx installed the SSL function module. [Root@www conf]# OpenSSL genrsa-out cert.key2 2048 generate Cert.key2 private key fileGenerating RSA private key, 2048 bit long modulus......................+++......................

chmodThe permission used to change the file or directory. In the UNIX system family, the control of file or directory permissions is differentiated by reading, writing, and executing 3 general permissions, and there are 3 special permissions to be

MCU's micro-core, if UCOS-II has confirmed all task code snippets, stack segments, constant ends, etc. at compile time, and these are both direct and physical address bindings, this can be called a compilation of physical address bindings that

Pit more, one speaking. 1, storage problems. The WIN10 hard disk format is generally NTFS, and the hard disk format under Linux is usually XFS. So before installing the dual system, the hard disk format should be sorted out. WIN10 installation is

1. In Linux development, the input subsystem can generate those events. The type of event for input devices in Linux (here is a list of some of the most commonly used, more see LINUX/INPUT.H):Ev_syn 0x00 Sync EventsEv_key 0x01 Key EventEv_rel 0x02