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CPU is the soul of a computer, determines the overall performance of the computer. Now the mainstream CPU is multi-core, and some use multithreading technology (hyper-threading, referred to as HT). Multicore may also be easy to understand, believing that a lot of players can say why. But what does hyper-threading really mean, what is the difference between a CPU that supports hyper-threading and the ability to turn off HT, there's probably not a lot o
, waiting for CPU processing.Understanding the process of CPU interrupt processing, it is not difficult to understand the following a common scenario:When copying a file, enter information into a text box, the text box will appear briefly suspended animation, keyboard input data can not be displayed in a timely manner in the text box, it will take a while to gradually display.This is because the interrupt operation (entering information into the text box) is lower in the priority of the interrup
Process: A process is a program that processes can use multi-core CPUs.Threads: the smallest execution unit in a process, working on a threadThere is at least one thread in a process (master thread) that can have multiple threads (child threads)Threads are independent of each other. The main thread and child threads are also independent of each other.The main thread executes the command from beginning to end. Does not wait for a child thread. When the child thread finishes executing, it will dis
execute, must first get the Gil, we could think of Gil as a "pass", and in a Python process, the Gil has only one. A thread that does not have a pass will not be allowed to enter CPU execution. In python2.x, the Gil's release logic is that the current thread meets the IO operation or the ticks count reaches a maximum of (ticks can be seen as a counter of Python itself, specifically for the Gil, which is zeroed after each release, this count can be Sys.setcheckinterval to adjust), to be released
Article Title: differences between LINUX and other operating systems. 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. It is very important to know how Linux differs from other operating systems. Here we mainly discuss the operating systems on PCs, such as MSDOS, Windows, and Unix. First, you must note that Linux and these operating systems can coexist on the
I often see some people discuss whether the C language assignment statement is an atomic operation? Is the C ++ statement an atomic operation? Webopedia:Atomic implies indivisibility and irreducibility, so an atomic operation must be specified med entirely or not completed MED at all.An operation during which a processor can simultaneously read a location and write it in the same bus operation. this prevents any other processor or I/O device from writing or reading memory until the operation is
forgive me. Overview What is a router? Figure 1 The Internet is connected by routers, which are the core devices of the Internet or an IP network. The increasing bandwidth access has led to the increasing demand for routers. What kind of technical product is vro? When talking about the development of vrouters, we can't help but talk about the development of "embedded" devices. That's right. Generally speaking, vrouters are embedded products. So what is an embedded devic
an operating system contiki--for resource-constrained environments. Contiki provides the ability to dynamically load and unload personal programs and services, its kernel-based time-driven (Event-driven), and support for preemptive multithreaded mechanisms. Programs that explicitly require multi-threading will be linked to a library, which enables preemptive multithreading.Contiki is implemented by the C language and has been ported to many microprocessor
One, 8086CPU 1, microprocessor(1) Micro-control machine: Also known as single-chip microcomputer (2) DSP chip: Digital signal processing chip (3) Embedded microprocessor (4) Universal microprocessor: PC Station, workstation, server using the processor 2. Internal structure:(1) Bus interface Unit (BIU): A. Responsible for data transmission and instruction Reading
building lighting system real-time monitoring. The Coordinator is responsible for establishing, managing and maintaining the network, receiving the information of each routing node, and then sending the data to the computer through the serial port, displaying the real-time situation in the computer terminal and transmitting the control command. The routing node has the functions of terminal control, information acquisition and automatic alarm. 2.2 Hardware Design The classroom node is mainly co
The main difference between random access memory and magnetic media memory is that random access memory is volatile and softThe data on the disk or on the hard drive remains, unless you intentionally delete or write the overlay. In addition, there is a significant difference only inUnderstanding how microprocessors work can be understood: when a microprocessor outputs an address signal, it is usually addressed to a randomMemory, not magnetic media.Rem
field of word processing and graphic image processing. 4th Generation: LSI Machine (1970-present) In terms of hardware, logic components are used in large scale and VLSI (LSI). In the aspect of software, database management system, network management system and object-oriented language are presented. It is characterized by the birth of the world's first microprocessor in Silicon Valley in the 1971, creating a new era of microcomputers.
relationship between them. instruction Cycle: is the CPU's key indicator, which refers to the time to take out and execute an instruction. In general, the machine cycle is the unit, single instruction execution cycle, double instruction execution cycle, etc. Most of the current processor instructions (ARM, DSP) use a single instruction execution cycle. Machine Cycle: complete a basic operation of the time unit, such as the reference period, take the number of cycles. Clock cycle: The inverse of
In 1.1946, the world's first computer ENIAC was born at the University of Pennsylvania. 2. The first microcomputer appeared at Intel in. Its microprocessor was million times/second. 3. Memory 4 GB (1g = 1024 M, 1 m = 1024 K, 1 k = 1024b ), Clock speed: 4 GHz (1g = 1000 m, 1 m = 1000 K, 1 k = 1000Hz) 4. Font length: the number of digits that the cup can process binary information at a time. 5. Based on the number of CPUs, it can be divided into giant c
The arm + LINUX route focuses on the embedded Linux operating system and its application software development goals: (1) master the structure and principle of mainstream embedded microprocessor (initially set as ARM9.) (2) Master An Embedded Operating System (initially set as uClinux or Linux, the version is to be determined) (3) be familiar with the embedded software development process and have at least one embedded software project. The benefits o
Comparison of main ZigBee chip vendor's ZigBee solution competitiveness Comparison of main ZigBee chip vendor's ZigBee solution competitivenessAt present, there are major ZigBee chip vendors (2.4 GHz), including Ti/chipcon, Ember (ST), jennic (), Freescale, and microchip.Currently, ZigBee technology provides three methods:1) ZigBee RF + MCU, such as Ti CC2420 + MSP430, freesclae mc13xx + GT60, microchip mj2440 + pic mcu.2) Single-Chip Integrated SOC, such as Ti cc2430/cc2431 (8051 kernel), Frees
The learning plan for the embedded Linux operating system is clear, and the most important thing is the recommended books. If you plan to enter this line of development, you must learn everything !!!The arm + LINUX route focuses on the embedded Linux operating system and its application software development goals:(1) master the structure and principle of mainstream embedded microprocessor (initially set as ARM9)(2) You must master an embedded operatin
Embedded Linux OS learning plan The arm + LINUX route focuses on the embedded Linux operating system and its application software development goals: (1) master the structure and principles of mainstream embedded microprocessor (initially set as ARM9)(2) You must master an embedded operating system (the initial version is uClinux or Linux, and the version is to be determined)(3) be familiar with the embedded software development process and build at l
/* Mainly view the Memory Distribution · In a microprocessor, data such as long/DWORD (32bit) 0x12345678 is always stored in the big endian mode. · However, in the memory, the data storage sequence varies depending on the microprocessor vendor.One order is called Big-Endian, that is, putting the highest byte at the beginning; the other order is called Little-Endian, that is, putting the second byte at the b
------ Drop: 4 lessons --------- Chapter 2: internal structure of 8086cpu1. the microprocessor bus structure is divided into internal structure and external structure.The 2.8086cpu chip has 40 pins, which are connected to the external logic for information exchange.These pins are the microprocessor and bus. They have the following functions:1. Exchange information with memory2. Exchange information with IO
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