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Analysis of Java HotSpot(TM) 64-Bit Server VM warning: CodeCache is full. Compiler has been disabled.Java Hot
Table of Contents Analysis of Java HotSpot(TM) 64-Bit Server VM warning: CodeCache is full. Compiler has been disabled. What is CodeCache? Why is CodeCache full? How to solve the problem of CodeCache being full? 1. Increase the size of CodeCache 2. Optimize application usage in conclusion Practical application scenario example: concurrent request processing Analysis Java […]
About disabling cluster ipv6 DNS requests
The article is reproduced from: https://blog.51cto.com/mahmut/8141303 Environment: System: Tongxin Youyue 1060A Cluster: Tongxin Youque bare metal deployment Source of the problem Youque cluster basic node DNS configuration copy <code>[root@bastion ~]# cat /etc/coredns/Corefile .:53 { template IN A apps.utccp.example.com { match .*apps\.utccp\.example\.com answer “{<!– –>{ .Name }} 60 IN A 10.12.24.125” fallthrough } hosts { 10.12.24.125 […]
The ruoyi framework front-end modifies the message disappearance time
Modification tutorial Open the modal.js file, find Message.success, and then set the parameters. The unit is 1000=1 second. //The parameters that can be set are as follows export interface ElMessageOptions { /** Message text */ message: string | VNode /** Message type */ type?: MessageType /** Custom icon’s class, overrides type */ iconClass?: string /** […]
How to disable SIP system integrity protection? SIP system integrity shutdown method
Original link: How to disable SIP system integrity protection? SIP system integrity shutdown method – FCPX template station Many Mac users report that after installing some software, they are prompted that there is no mountable file system (or other). It may be that the SIP system integrity is not turned off. Let’s take a look […]
QT realizes that the pop-up prompt box slowly fades and disappears
Refer to the original text: qt message pop-up box, no frame, disappears slowly and automatically The code was modified based on the original author’s instructions, and bugs such as the prompt box not being centered horizontally, the color modification being invalid due to the influence of the parent class during use, and the timer not […]
MySQL log data table, how much faster is MyISAM than InnoDB query?
Table of Contents Briefly introduce the two engines Start actual measurement Comparing the capacity occupied by data, MyISAM occupies less space. From the comparison of query efficiency, MyISAM is indeed faster. MYISAM table structure Laravel table creation statement Laravel scheduled task-clean logs and keep only the latest 3 million records A brief introduction to the […]
[Multi-threading] The concept of threads {heap area management in the Linux kernel; conversion of virtual addresses to physical addresses, pages, page frames, page tables, MMU memory management units; Linux thread concepts, lightweight processes; thread sharing processes Resources; Advantages and Disadvantages of Threads; Purpose of Threads}
1. Supplementary content 1.1 Heap area management in Linux kernel vm_area_struct (VMA) is a data structure in the Linux kernel, which represents a heap memory area in the process virtual memory space. It is used to track various properties and information about the heap memory area, such as starting and ending addresses, permissions, flags, and […]
Four examples of automated testing models and their advantages and disadvantages
1. Linear test 1. Concept: A linear script generated by recording or writing the steps corresponding to the application. Simply to simulate the user’s complete operation scenario. (operations, repeated operations, data) all mixed together. 2. Advantages: Each script is relatively independent and does not generate other dependencies or calls. 3. Disadvantages: The development cost is […]
Analysis of the advantages and disadvantages of six methods of packaging Python code
Python is a high-level programming language that is easy to learn, easy to use, and cross-platform, so it has been widely used in development. However, Python code needs to be run in the Python interpreter, which may be inconvenient for some users. As an interpreted language, Python makes the source code public upon release. Although […]