clock with nanoseconds

Introduction to vector clock Algorithms I. background Let's talk about the scenario where vector clock is needed. When writing data, we often hope that the data will not be stored at a single point. For example, db1 and db2 can both provide write services and all data is stored. No matter which database is written, the client does not have to worry about Data Writing disorder. However, in real scenarios, pa

STM32 Register version--Internal clock settingAlso remember to set the delay initialization function.1 //system clock initialization function2 //PLL: Selection of times, starting from 2, maximum value is3 //PLL: Select the frequency of times, where the internal clock is used, the PLL is 4 is 4 frequency4 voidstm32_clock_init (U8 PLL)5 {6UnsignedChartemp=0; 7Myrcc

Clock cycle: the clock cycle, also known as the oscillation cycle, is defined as the reciprocal of the clock pulse frequency (the clock cycle is the reciprocal of the single-chip microcomputer external crystal oscillator, such as a 12 m crystal oscillator, the clock cycle is

that as long as the r+w>n, can guarantee the availability of the cluster. The values of N, W, R can be set. If you pay attention to the efficiency of reading, you can set the value of r smaller; If you pay attention to the efficiency of writing, you can set the value of W smaller. NWR does not guarantee consistent data. If R=n and w=n, then consistency can be guaranteed.Vector clockFor small or low-demand distributed systems, the time stamp can be used to ensure consistency of data between repl

In Linux, many activities are related to time, such as process scheduling and network processing. Therefore, understanding the clock processing mechanism in the Linux operating system helps to better understand the operating methods of the Linux operating system. This article analyzes the clock Processing Mechanism of Linux 2.6.25 kernel, first introduces some hardware timers in computer systems, then, it f

Clock is a necessary item in daily life, with it we can have a planned study and work. This time we use Flash to make a fine little clock, you can drag it to the corner of the computer screen, so that you can easily see the current time and date. The final effect of this example is shown in Figure 1. The final effect of figure 1: 1. Start Flash First, create a new movie, set

Clock Several primary school teachers have been invited to do courseware for them, there are several classes are about the clock, in order to enable pupils to fully understand the clock, had to make a number of clock with time scale. I remember as a child, multi-media teaching has not appeared, the teacher in order to

Instruction Cycle The instruction cycle is the sum of the time that the CPU takes out an instruction from memory and executes the instruction, typically consisting of several machine cycles, from the fetch instruction to the analysis command to the time required to complete the execution. Machine Cycle The machine cycle is also called the CPU cycle, because the CPU spends a long time accessing the memory, so it is defined with the shortest time to read an instruction word from memory. In the c

Understanding the STM32 clock is the basis for our application timers and more, based on recent work:Here is the clock tree for STM32:1. First note is the picture of the green Circle of two, HSE and HSI respectively represents the external clock and internal clock, where HSE is a high-speed external

In the official Application note, we can see that the PCNT oversampling routine uses a 32 Khz clock source as the reference clock source. There is also an orthogonal code. Although the external signal is used as the clock of the PCNT module, we rarely use orthogonal code. In addition, we can better master this function only when we have used it. Therefore, we sti

Instructor song,Hua Qing vision embedded college lecturer. 1.1 Introduction to rtc In an embedded system, RTC is usually used to provide reliable system time, including hour, minute, second, and year, month, and day, it is also required that the system work properly when it is shut down (usually powered by a backup battery ). Its Peripheral does not require too much auxiliary electrical channels. Typically, it only requires a high-precision 32.768khz crystal and resistance capacitor, as shown in

parts of the the system Power and Thermalmanagement controllers), which makes it difficult to createplatform-independent solutions. The "problem" a common clock framework faces is the sheer numberof different struct CLK definitions scattered Oughout the Armtree. There are more than two dozen definitions in arch/armcurrently, but the proposal to a commonframework not surprisingly re Duces that number to one. Implementations canwrap the struct CLK in

This article mainly introduces the graphic html5 clock examples that will move around. For more information, see use HTML5 to create a clock. The Code is as follows: Html5 clock ScriptVar Clock = function (canvas, options ){This. canvas = canvas;This. ctx = this. canvas. getContext ("2d ");This. options = op

/*************************************** ************************************* * * Name: rcc_configuration * * Description: sets the system clock. * * Return value: None * **************************************** ************************************/ Void rcc_configuration (void) { Errorstatus hsestartupstatus; Rcc_deinit (); // RCC Reset Rcc_hseconfig (rcc_hse_on); // enable external clock