on delay vs off delay

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Notes Accurate delay under Linux, #include <linux/delay.h> call error

When writing application-level programs, sometimes you need to delay, what should I do?In the kernel code, we often see such a header file using # include The prompt error is as follows:error:no such file or directory.It is not very strange, obviously the file is there, how can not be called, and the kernel a lot of file calls very happy. What is this for?Because the kernel program differs from the application, some special kernel header file compiler

Three methods of STM32 delay function--best to master the Third Kind

authoritative guide. There are two ways to achieve this: A. Mode of interruption As below, define the delay time Time_delay,systick_config () defines the break time period, decrements the Time_delay in the interrupt, thus realizes the delay.volatile unsigned long time_delay; Delay time, note defined as global variableDelay N_msvoid Delay_ms (volatile unsigned long NMS){System clock interrupt for Systick cr

Everyone should know something. TCP---ACK delay

saved 200ms on every POST request (in search of performance-how we shaved 200ms off every POST request). This article discusses the reasons why every post in the beginning will cost 200ms more, and it's somewhat odd. Here's what's in this article.Ack Delay and Tcp_nodelay Ruby's bet::http divides the POST request into two TCP packets--a header, a body.curl, by contrast, which is more appropriate t

Using Pt-slave-delay to implement delayed backup of MySQL

Tags: pt-slave-delay mysql######################################################################### # # # # # MySQL installation initialization # # #########################################################################Slightly######################################################################### # # on three servers to build a master-slave environment (VM_WEB1-based, VM_WEB2 and VM_MYSQL1 from) # # ###############################################

Do you have procrastination? Proper delay relieves excessive anxiety.

Experts believe that delay is not because of laziness, but because of anxiety, fear of difficulties, or too much pursuit of perfection.    "I know that there are so many things in front of me: open files, messy wardrobes, just a phone call, an email to be sent out, and a restless little heart, we still bite our fingernails, and we may just say in a daze: Wait a moment, just wait ......" The above section comes from the Douban group, which has more t

TCP Nagle algorithm && delay ACK

to send a separate ACK;(3) If there are multiple data segments arriving within the delay time, the protocol stack is allowed to send an ACK to confirm multiple segments of the packet;3. When the Nagle encounters a delay ACK:Consider the following typical operation, write-write-read, that is, through a number of write small pieces of data to the peer to send a single logic operation, two write data length l

MySQL master-slave delay replication practice and production failure case recovery practice

1.1MySQL master-Slave delay Replication IntroductionFrom MySQL5.6 to support the master-slave delay replication, the main problem is that when the main library has a logical data deletion or error updates, all the library will be the wrong update, resulting in all database data anomalies, even if there is a scheduled backup data can be used for data recovery, especially when the database data is large, the

On the calculation of delay

Latency: is the amount of time that data (a message or packet, or even a bit) is transferred from one segment of the network or link to the other. Send delay : Is the time taken from the first bit of the sending data frame to the last bit of the frame to be sent. Transmit delay = data frame Length (b)/channel bandwidth (S/b) [channel bandwidth is data rate] propagation

[Computer network] calculation of various delay

Latency: is the amount of time that data (a message or packet, or even a bit) is transferred from one segment of the network or link to the other. Send delay : Is the time taken from the first bit of the sending data frame to the last bit of the frame to be sent. Transmit delay = data frame Length (b)/channel bandwidth (S/b) [channel bandwidth is data rate] propagation

C # implements the RABBITMQ delay queue feature

Recently, in the study of RABBITMQ, the project had a scenario where the order would be closed if the user had to pay for more than 30 minutes. Of course, we can do a timed task, each time to scan the unpaid orders, if the order is more than the payment time off, but there is no big problem when the volume of data is small, but the data volume of a large rotation database will become a special resource consumption. When faced with tens, billions of le

Delay EFFECT usage

Delaytime:The duration of the response is milliseconds (milli-second, 1‰ seconds. Feedback:It is just a few voices (for example, more and more voices), and the larger the set, the more sounds. Effectlevel:When the original sound pops up, the greater the tlevel, the larger the volume of the first delay sound, the lower the second voice, and the lower the third voice. So if the tlevel is set to small, you will only hear the delayed sounds after the orig

How to solve the MySQL database master-slave replication delay problem?

generated exceeds the range that slave a SQL thread can withstand, and the delay is generated, and of course there is the possibility of a lock wait with a large query statement from slave.3.MySQL Database Master-Slave synchronous delay solutionA: The simplest solution to reduce the slave synchronization delay is to optimize the architecture and try to get the D

Redis Source Analysis (31)---Latency delay analysis and processing

When it comes to delaying statistics, one of the nouns that must be thought of is "performance testing," Yes, in Redis's Redis_benchmark file, it does use the information in the deferred file. The official interpretation of this document in Redis: /* The latency monitor allows to easily observe the sources of latency * In a Redis the using the instance command . Different Latency * sources are monitored, like disk I/O, execution of commands, fork * system call, and so forth. * * Latency li

RTMP Live application and delay analysis

rtmp Live application and delay analysis Original address: https://github.com/ossrs/srs/wiki/v1_CN_LowLatency Author: Winlin Related articles:Take you thoroughly understand rtmpSome considerations for implementing RTMP protocol with live push streamingHow the live platform uses rtmp for low latency video streamingRTMP protocol analysis and interaction processIn live streaming applications, rtmp and HLS can basically cover all clients, HLS is mainly de

Problems needing attention in C language delay of single-chip microcomputer

There are no empty statements in the standard C language. But in the MCU programming of C language, it is often necessary to use a few empty instructions to produce short delay effect. This is easy to achieve in assembly language, write a few nop on the line.In Keil C51, call the library function directly:#include//declared void _nop_ (void);_nop_ (); Produce a NOP instructionFunction: For the delay is very

Introduction to jquery data (), jquery Stop (), jquery delay () function (detailed) _jquery

,true) before the code that writes the animation effect, so every time you move the menu quickly, it's OK, and when you move to a menu, stop all the animations that join the queue and complete the current animation (jump to the end of the current animation). Finally we introduce jquery delay () The function of the delay () method in jquery is to set a delay val

Microsecond delay based on (QPC) implementation under Windows

1. Why write down microsecond latency in WindowsIn the efficiency of testing memcpy in the previous implementation of the memcpy () function and the process summary, the copy efficiency of the test time is in the microsecond level and requires a microsecond interval count.QueryPerformanceCounter is available under Windows (Querying for high-performance counters), and QPC is based on hardware counters that obtain high-resolution timestamps.Reference: Acquiring high-resolution time stampsApplicati

Good delay queue Design

The delay queue, as the name implies, is a message queue with deferred functionality. So, what is the scenario in which I need such a queue?BackgroundLet's look at the following business scenarios first: How to close the order in time and return the inventory when the order has been in a non-payment state? How do I regularly check if my refund status has been successfully refunded? Newly created store, n days without uploading a produ

Kernel delay function in Linux

The first class of delay function prototypes are: (Busy, etc.)void Ndelay (unsigned long nsecs);void Udelay (unsigned long usecs);void Mdelay (unsigned long msecs);Description: Kernel functions ndelay, Udelay, and mdelay are useful for short delays, respectively delaying the execution of the specified number of nanoseconds, microseconds, or milliseconds. They often involve a delay of up to a few millisecond

Gracefully use CSS Animation delay

Today, writing a CSS animation encountered a mini puzzle, recorded as follows:1. Requirements:Wait for the animation of element A to load and then load the B element animation2. Initial thinking:Adds delay to the animation attribute of the B element (delay, which causes the delay time = the load time of the A element animation)i.e.:animation:bmove 1s . 4s 1; (Her

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