Tag：process
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Database stored procedure
What is a database stored procedure? In fact, the definition is very simple: it is a defined SQL code that can be called repeatedlyWe can also define stored procedures that can accept parameters, so that we can deal with requirements more flexibly. grammar CREATE PROCEDURE procedure_name AS sql_statement GO; EXEC procedure_name; example CREATE PROCEDURE SelectAllCustomers […]
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Top ten project management (IV) cost management
Cost management isTry to control the actual cost of the project within the budget and ensure that the project is completed within the budget。 There are four main sub processes:Planning cost management、Estimated cost、Budget makingandControl cost。 The main types of costs are: The following describes these sub processes in detail: 1、 Planning cost management Planning the […]
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[model reasoning] quantization implementation share 3: explain the implementation of aciq symmetric quantization algorithm in detail
Welcome to follow my official account [Jizhi horizon] and reply to 001 to obtain Google programming specification O_o >_< o_O O_o ~_~ o_O Hello, I’m Jizhi horizon. This paper analyzes the implementation of aciq symmetric quantization algorithm, taking Tengine’s implementation as an example. This is the third part of […]
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Top ten project management (III) progress management
Project schedule management refers to the management of the progress degree of each stage and the deadline for the final completion of the project in the process of project implementation. Its purpose is to ensure that the project can achieve the overall goal of the project on the premise of meeting its time constraints. that […]
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Linux multi process — using MMAP mapping to copy files
1、 MMAP shared mapping area 1. Create mapping area function MMAP void *mmap(void *addr,size_t length,int prot,int flags,int fd,off_t offset); Addr ， pass null Length: length of transmission mapping area prot PROT_ Read readable PROT_ Write ， writable flags MAP_ Shared; The modification of memory will affect the source file (the source file is the file […]
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be careful! Monitor whether MySQL service is normal. Just understand these four methods
Source: http://blog.chinaunix.net/uid-90618-id-5846539.html?utm_source=tuicool&utm_medium=referral Monitor whether the MySQL service is normal. The general idea is: check whether port 3306 is started, PS check whether the mysqld process is started, log in to MySQL from the command line, return the result of the execution statement, detect PHP or JSP programs (developers are required to develop programs), etc; Method […]
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Hive formation
On all nodes: su – hadoop jps #To see namenode, secondarynamenode and ResourceManager processes on the master, and datanode and nodemanager processes on slave1 and slave2 If the process is not running, enter the following command: start-all.sh #Deploy MySQL server on master yum -y install unzip cd software/ unzip mysql-5.7.18.zip cd mysql-5.7.18 yum -y install […]
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How does the nodejs process exit
There are several factors that can cause the nodejs process to exit. Some of these factors are preventable, such as the code throwing an exception; Some are not preventable, such as memory exhaustion.processThis global variable is an event emitter instance. If the process exits gracefully,processOne will be distributedexitevent. The application code can listen to this […]
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Interviewer: how does nginx achieve high concurrency? What are the common optimization methods?
This is an interview question brought back by a reader How does nginx implement concurrency? Why doesn’t nginx use multithreading? What are the common optimization methods of nginx? What are the possible reasons for the error 502? Interviewer psychological analysis It mainly depends on whether the candidates are familiar with the basic principles of nginx, […]
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Android keep alive program
1：low memory killer Considering the performance and experience of the system, the app will not really kill and drop the process after it retreats to the background, but cache it.The more applications are opened, the more applications are cached. When the system process is insufficient, the system determines which processes to kill according to its […]
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High frequency interview questions for Android posts in large factories: tell me about your understanding of zygote!
preface Zygote can be said to be a high-frequency question in Android development interview,But there are always small partners answering this question, which can’t satisfy the interview,Here you have to find out what the interviewer wants to hear most and what he actually wants to ask when you ask for your understanding of zygote?Let’s analyze […]
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Quantitative performance test of nginx and gunicorn
preface NginxFamous, no one in the world knows you, so you don’t have to introduce it. It’s known as a million level connection. Gunicorn, Pythonwsgi server。 It is an important part of Python web ecology, which is equivalent to that under Javatomcat。💪💪💪 Today, let’s take a quantitative look at the specific values of RPS of […]