Tag: jvm

android

GC collection mechanism and generation collection strategy

February 1, 2024

by Joanna Murphy

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Garbage Collection: Garbage Collection, abbreviated GC. Garbage collectors in the JVM automatically collect unwanted objects. But the price of automatic GC collection is that when...

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The back-end

How is registering local methods with the JVM implemented

February 1, 2024

by Megan Barker

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In Java, we often encounter the situation of calling local methods, and many classes in the Java core library also make extensive use of local...

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The back-end

Why does the JVM have two Survivor partitions in the new generation?

February 1, 2024

by Kevin Mendoza

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This paper will use the method of elimination to explain the new generation of regional division, so that readers can more clearly understand the principle...

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The back-end

An overview of several states of JVM built-in lock synchronized

February 1, 2024

by Megan Jenkins

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"This is my fourth day of participating in the First Challenge 2022. For more details: First Challenge 2022." Built-in locks use Java built-in locks that...

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The back-end

Rewrite the pot of Finalize method: a full GC time-consuming and frequent fault location

February 1, 2024

by James Ball

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At first, the blogger encapsulated A REST client with the client API provided by Jersey and integrated it into business system A. As A result,...

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The back-end

Java object disclosure based on Hostpot VIRTUAL machine

February 1, 2024

by Anahita Dua

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"This is the third day of my participation in the First Challenge 2022, for more details: First Challenge 2022". Creation of Objects Java is an...

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The back-end

The Survivor zone of the JVM is only 20M.

February 1, 2024

by Tejas Chaudhry

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One day, a student in the group sent a map of jmap-heap memory usage. It says Survivor zones are always above 98%. The From and...

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The back-end

JVM_16 bytecode instruction set and parse example I

February 1, 2024

by Dr. Nathan Davis

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Java bytecode is to virtual machines what assembly language is to computers, basic execution instructions. Java virtual machine inserts consist of a one-byte number representing...

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The back-end

Ali Architect takes you deep into the JVM

February 1, 2024

by Lorraine Skinner

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The following figure shows the key internal components of a typical JVM (consistent with the JVM Specification Java SE 7 Edition). Multi-threading "or" free-threading "refers...

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The back-end

JVM lock optimization and escape analysis in detail

February 1, 2024

by Anna Wolfe

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"This is the fifth day of my participation in the First Challenge 2022. For details: First Challenge 2022." Lock optimization The JVM uses spin, adaptive,...

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The back-end

What exactly should the JVM learn

February 1, 2024

by Graham Curtis

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Pointing out what the next series of articles will cover, this article has left out the details in order to give you a clear picture...

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reading

Everything Java back-end development needs to know about JVM performance tuning is here.

February 1, 2024

by Tracey Manning

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Introduction With the development of the Internet, Java applications have strict requirements for high concurrency, high availability, fast response, etc., which are actually related to...

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The back-end

CountDownLatch and CyclicBarrier

February 1, 2024

by 李美琪

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This article mainly summarizes the CyclicBarrier and CountDownLatch Jar information, implementation logic, code analysis, project application and other information

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The back-end

JAVA concurrent programming – Avoid active hazards

February 1, 2024

by Rebecca Harmon

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We usually use locking mechanisms to ensure thread safety, but if locking is used excessively, it can lead to sequential deadlock of locks. Similarly, we...

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The back-end

Memory leaks caused by JVM tuning glibc

February 1, 2024

by Tara Ramirez

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Recalling from the previous article on JVM tuning G1 for CMS, we switched from G1 to CMS and adjusted JVM parameters, resulting in very slow...

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android

Illustrated JVM bytecode execution engine

February 1, 2024

by Amira Goda

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Learn something about the JVM

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The back-end

Virtual machine bytecode execution engine

February 1, 2024

by William Ortiz

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MethodHandle mechanism. How to find the correct method when the virtual machine executes code, how to execute the bytecode in the method, and the memory...

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reading

4. Runtime data area [heap]

February 1, 2024

by Brett Davies

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The Java heap area is created at JVM startup and its size is determined. The size of the heap memory is adjustable. Objects in the...

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reading

14. JDK command-line tools

February 1, 2024

by Billy Wright-Brown

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The jstat command can be used to display classloading, memory, garbage collection, JIT compilation, and other running data in local or remote virtual machine processes....

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The back-end

2. Class loading mechanism

February 1, 2024

by Yasmin Sachar

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A Class file is a set of binary streams based on 8-bit bytes, without any separators between data items. When encountering data items with more...

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The back-end

1. The description of the JVM

February 1, 2024

by Mary Prentice

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This is done by bootstrap Class Loader to create an initial class that is specified by the virtual machine's concrete implementation. When a so-called Java...

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The back-end

9. String constant pool

February 1, 2024

by 範淑玲

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As long as one of them is a variable, the result is in the heap. Variable concatenation works because StringBuilder ensures that there is only...

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reading

12. Garbage Collection [Garbage collector]

February 1, 2024

by Anvi Chandra

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Garbage collectors are not specified in the specification and can be implemented by different vendors and versions of JVMS. Due to the rapid iteration of...

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The back-end

7. Runtime data area [object’s instantiated memory layout and access location, direct memory]

February 1, 2024

by Thomas Holden

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The virtual machine checks a new instruction to see if its arguments can locate a symbolic reference to a class in Metaspace's constant pool, and...

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reading

The virtual machine bytecode execution engine, the MOTOR diagram of the JVM, is love

February 1, 2024

by Patricia Nolan

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The first thing we need to know is that virtual machines are relative to physical machines. While this may seem like a bit of a...

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The back-end

3. Runtime data area [PC register, virtual machine stack, local method stack]

February 1, 2024

by Bruce Moreno

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During the execution of a Java program, the Java virtual machine divides all of its memory into several data areas, which have their own purposes...

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reading

13. OOM

February 1, 2024

by Caitlin Taylor DDS

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Reasons: 1. Creating a large object 2. Exceeding expected volume of visits/data 3. Memory leaks Some resources that provide close are not closed and cause...

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The back-end

8. Execution Engine

February 1, 2024

by Guy Jones-James

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In the JDK1.0 era, it was more accurate to define the Java language as "interpreted execution." More recently, Java also developed compilers that could generate...

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The code of life

JVM 2: How to read bytecode

February 1, 2024

by Luke Robinson

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How is access to 'this' in methods implemented in the JVM? Combine 'ClassFile Structure' from the JVM specification with tools to look at it from...

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The back-end

10. Garbage collection [Overview, related algorithms]

February 1, 2024

by Steven Goodwin

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If garbage in memory is not cleaned up in time, the space occupied by garbage objects will remain until the end of the application, and...

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