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Timer module overview    sylar implements the timer function based on epoll. Because the accuracy of epoll is milliseconds, the accuracy of its timer is also milliseconds. The timer has the design based on time wheel and time heap. In sylar, it adopts the design of minimum heap. For the specific explanation of timer, please refer ...

catalogue 1, DNS - domain name system 2, DNS domain name structure 3, DNS server type 4, Steps to build DNS domain name resolution server Domain name resolution using virtual machine win10 1, DNS - domain name system DNS definition: DNS is the English abbreviation of "domain name system". As a distributed database that maps ...

#My QQ email authorization code: XXXXXXX 1.Python automatically sends mail import smtplib from email.mime.text import MIMEText from email.header import Header qq_host = "smtp.qq.com" # Sending server qq_port = "465" # Sending server port qq_username = 'XXXXXXX@qq.com' # Sending user name qq_password = "XXXXXXXXX" # Sending authorization co ...

What is a label When publishing a version, we usually tag it in the version library first, so that we can only determine the version at the time of labeling. Whenever a label version is taken in the future, it is the historical version of the labeled time. Therefore, the tag is also a snapshot of the version library. Although the Git tag is a ...

Linux device driver learning notes - Advanced Character driver operations - Note.4 [blocking I/O] LINUX DEVICE DRIVERS，3RD EDITIONMany of them are extracted from the Linux kernel source code 6.2 blocking I/O The driver should (by default) block the process and put it to sleep until the request can continue. This section shows how to put a p ...

LVS Article catalogDocker builds a simple LVS - dz45693 - blog Park (cnblogs.com) Linux Virtual Server, Linux Virtual Server, mainly realizes soft load scheduling 1, Introduction 1.1 three working modes of LVS NAT - network address translation NAT (Network Address Translation) refers to Network Address Translation. The requested data p ...

Personal Taobao store link Partners in need can click here 1 Preparation (1) Download the official website of tomcat, unzip it to / Library, start the Tomcat server, and the official website of Tomcat appears; (2) When downloading MySql, the Mac should not download the latest version, because MySql cannot be opened in the system preferences. ...

preface After we purchase a ECs, we usually need to install some common software. This article will introduce the common installation methods and configurations of some softwareBefore installing the software, we need to do some preparatory workFirst, check whether the yum source is available. If the following figure appears, it indicates ...

brief introduction This routine issues the instruction for NodeMCU-ESP8266 to connect to alicloud Iot platform. In fact, it publishes messages for the specified device Topic to achieve the effect of control. Specifically, it publishes messages to the Topic of product / product details / Topic class list / object model communication / sys/gmvzw ...

Innodb of Innodb engine_ lock_ wait_ Timeout parameter description explain First, the Innodb engine will lock the corresponding row when executing the update statement and will not release it until the transaction is committed or rolled back. In the process of holding a row lock, if other transactions b also want to modify the data of the loc ...