Programmer Think

What can Arthas do for you? Arthas is an open source Java diagnostic tool of Alibaba, which is deeply loved by developers. When you encounter the following similar problems and are helpless, Arthas can help you solve them: Which jar package is this class loaded from? Why are all kinds of related exceptions reported? Why didn't the code I chan ...

1, Zabbix 1. Necessity of monitoring system As an O & M, you need to be able to use the monitoring system to view the server status and website traffic indicators, and use the data of the monitoring system to understand the results published online and the health status of the website. 2. Function of monitoring software With an ex ...

summary perp is an excellent and low resource consuming open source multi process management framework, which is mostly used in embedded system environment. Since there are few resources on the Internet other than those on the official website, I'll record my previous experience and share it with you. Compared with restart D, perp has mor ...

1, Assign and release equipment numbers Using register_ The chrdev function only needs to give a master device number when registering a character device, but this will cause two problems: ① . it is necessary to determine which main equipment numbers are not used in advance.② . all secondary equipment numbers under a primary equipment number ...

1. Download the installation package and prepare the environment wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.30-linux-glibc2.12-x86_64.tar.gz# Create the following directory (directory location customized, no mandatory) Software path: /opt/mysql/ Data Path: /data/mysql/data/ Binary Path:/data/mysql/binlog/ Communication path: ...

outline backtrace (abbreviated as bt) Prints all information about the current function call stack. backtrace n is a positive integer that only prints stack information at the top of the stack. backtrace <-n> The -n table is a negative integer indicating that only the stack information at the bottom of the stack is printed. frame ...

Linux signal learning notes (1) Program running   there are several ways to abort this program when the following code is running. #include<unistd.h> #include<stdio.h> using namespace std; int main() { for(int i=1;i<=100;i++) { printf("time of programe running:%ds\n",i); sleep(1); } } 1. &ems ...

Iptables firewall is used to manage packet filtering and NAT rules. Iptables comes with all Linux distributions. Understanding how to set up and configure iptables will help you manage your Linux firewall effectively. Iptables tool is used to manage Linux firewall rules. At first glance, iptables can look complex (or even confusing). However, ...

1. Delete 0 byte file find -type f -size 0 -exec rm -rf {} \; 2. View process Sort by memory size PS -e -o "%C : %p : %z : %a"|sort -k5 -nr 3. Sorted by CPU utilization from large to small ps -e -o "%C : %p : %z : %a"|sort -nr 4. Print the URL in the cache grep -r -a jpg /data/cache/* | strings | grep "http:" | awk -F'http:' '{print "ht ...

The concept of thread synchronization Thread synchronization means that when a thread makes a function call, the call will not return until the result is obtained. At the same time, other threads cannot call this function to ensure data consistency.   Examples of thread synchronization Create two threads, let the two threads share a glo ...