Tag: garbage

java garbage collector

How to find trash? 1. Reference count. When the reference count becomes 0, it is considered garbage. However, this method cannot solve the problem of circular references. A → B → C ↑________↓ 2.Root Searching root reachability algorithm When java first runs, it will call the main method. The objects in the main method are […]

Writing a Simple Garbage Collector in C

Article directory Make malloc Mark and scan Scan the heap Scan a continuous area Find data segment Find the bottom of the call stack Integrate Writing a simple garbage collector in C (maplant.com) Make malloc Header describes memory block typedef struct header {<!– –> unsigned int size; struct header *next; } header_t; Dynamically allocated memory […]

“Understand in one article” CMS garbage collector

Contents of this chapter CMS Garbage Collector The CMS (Concurrent Mark Sweep) collector is a collector that aims to obtain the shortest collection pause time. CMS collector is mainly used for Internet projects that require low latency (ie: improved response speed). Set CMS collector parameters: -XX: + UseConcMarkSweepGC. The algorithm used by the CMS collector […]

Implementation of garbage classification smart trash can project based on OrangePi Zero 2 (2) C language calling Python code–installation and testing of dev dependent libraries of libpython3

Environment Construction and Testing If you want to call python code in C language, you need to install the dev dependency library of libpython3 Installation: dev dependency library of libpython3 Use the following command to check whether dependent packages already exist: dpkg -l | grep libpython3 It can be seen that there is no library […]

Variables and constants, input and output functions, and processing of garbage characters

Variables Concept: A value that may change during the execution of the program. Definition: Storage type Data type (example) Variable name (example) auto (defaults to auto when omitted) int a (auto) int a; Initialization: ① Define first, then initialize: (auto) int a; // definition a = 6; // initialization (assignment) ② Initialize when defining: (auto) […]

Implementation of garbage classification smart trash can project based on OrangePi Zero 2 (4) USB camera access test

1. USB camera test OrangePi Zero 2 official user manual download link (3.13.6. USB camera test): https://pan.baidu.com/s/1beIF5FMjWi2jw6nD83GYGg?pwd=himu 1) First insert the USB camera into the USB interface of the Orange Pi development board 2) Then through the lsmod command you can see that the kernel automatically loads the following modules orangepi@orangepi:~$ lsmod 3) Through the […]

What are the jvm garbage collection algorithms and their principles?

Directory Garbage collector 1 Serial collector 2 Parallel collector 3 ParNew Collector 4 CMS collector 5 G1 Recycler Three-color labeling algorithm The process of labeling algorithm Three-color marking algorithm defects Multiple standards Missing mark Garbage Collector Garbage collection mechanism, we already know what kind of objects will become garbage. What goes through object recycling – […]

Single-chip microcomputer design Garbage classification system design based on single-chip microcomputer

Summary This article designs an intelligent garbage classification and identification garbage bin control system based on STC89C52RC. At present, the style and structure of trash cans are relatively simple and cannot perform the role of classification and recycling well. Moreover, disadvantages such as mosquito and fly breeding, sewage spillage, and odors are also exposed during […]