this article describes the ARM32 processor.
Kernel page table: that is, the main kernel page table mentioned in the book. In the kernel, it is actually a section of memory stored in the global directory init of the main kernel page_ Mm. PGD (swap_pg_dir), the hardware is not used directly. Process page table: each process's own page ...
Posted by ugriffin on Sat, 20 Nov 2021 06:27:39 -0800
Construction of centos7 Nacos service registry
Since the spring cloud registry Eureka has long stopped maintenance, we use Nacos
Welcome to the world of Nacos!
Nacos is dedicated to helping you discover, configure, and manage microservices. Nacos provides a set of easy-to-use feature ...
Posted by Royalmike on Sat, 20 Nov 2021 05:25:26 -0800
Linux operating system boot process
Overview of the boot process
1. Post After the server host is powered on, the CPU, memory, graphics card, keyboard and other devices will be preliminarily tested according to the settings in the BIOS of the motherboard. After the test is successful, the system control will be handed over according to t ...
Posted by KnottyAlder on Sat, 20 Nov 2021 03:46:23 -0800
IO multiplexing: listen to multiple file descriptors at the same time
Interview frequencyWhat are the disadvantages of select and poll = > using epollepoll ET mode and LT mode
The focus is on the read event EPOLLIN, because the read event requires data in the buffer before it can be read, and if there is no data, it will b ...
Posted by helpmeplease2 on Sat, 20 Nov 2021 01:47:49 -0800
command [options] [arguments]
Basic instructions: Directory related instructions, ordinary file instructions, matching search instructions, permission related instructions Instruction usage rules: instruction name [operation option] [operation object]
Instruction Name: the name of a command, indicating the command to be exe ...
Posted by mikie46 on Fri, 19 Nov 2021 21:39:48 -0800
Thread synchronization: in a multithreaded environment, we can get the desired results regardless of the scheduling order Synchronization methods: semaphores, mutexes, conditional variables, read-write locks Mutex can only be used in mutex scenarios, and its function is equivalent to that of binary (0 / 1) semaphores
pthread_create: creates an ...
Posted by nolos on Fri, 19 Nov 2021 10:07:54 -0800
Teach you to build a gray publishing environment
Tip: gray release, also known as Canary release, Canary release
The term comes from the tradition of coal miners bringing caged canaries into the mine. Miners know the concentration of carbon monoxide in the mine through canary. If the concentration of carbon monoxide is too high, Canary wil ...
Posted by hamboy on Fri, 19 Nov 2021 08:29:27 -0800
In python, the use of multiple processes can bypass the limitation of GIL, so as to make full use of multi-core CPU to speed up tasks. However, if the process is not handled properly, it is easy to cause Zombie process or Orphan process , resulting in a waste of system resources.
This paper analyzes the writing methods of these two processes t ...
Posted by xkellix on Fri, 19 Nov 2021 05:53:06 -0800
1. Select installation package
The source file directory can be found in the official of postgresql. The address is as follows: Official website address of postgresql , select the corresponding version for installation according to the project requirements, as shown in the figure below:
① Unzip the installation package First, ...
Posted by iknownothing on Fri, 19 Nov 2021 03:54:03 -0800