java memory analyzer

I drew a mind map of the memory area of Java and the main functions of each area.simulating Java heap overflowThe Java heap is used to store object instances, as long as the objects are constantly created and the GC roots to the object to avoid being purged by the recycle mechanism, the

I drew a mind map of the memory area of Java and the main functions of each area.simulating Java heap overflowThe Java heap is used to store object instances. It is only necessary to constantly create objects and ensure that the GC roots between objects has an accessible path to avoid being purged by the recycle mechan

I stitched up a JVM memory graph from online search: as shown in:Let's consider a few questions:How does the 1.jVM work?How is the 2.JVM runtime memory allocated?3. In what area do we write Java code (classes, objects, methods, constants, variables, etc.) in the end?VM Run-time data region:1. Procedure counter (program Counter Register):is a small amount of

Java Memory Overflow DetailedOne, the common Java memory overflow has the following three kinds:1. Java.lang.OutOfMemoryError:Java heap Space----JVM heap (heap) overflowThe JVM will automatically set the JVM heap value when it is started, and its initial space (that is,-XMS) is 1/64 of the physical

Heap and non-heap (non-heap) memoryAccording to the official statement, "Java virtual machines have a heap, the heap is a runtime data region, and all class instances and arrays of memory are allocated from here." The heap is created when the Java virtual machine is started. "" The memory outside the heap in the JVM is

This article introduces a summary of memory areas and various memory overflow scenarios in Java virtual machines.Data regionMethod area, heap, virtual machine stack, program counter, local method stackMethod areaUsed to store class information, constants, static variables, and immediate compiler-compiled code that have been loaded by the virtual machineRun a cons

Recently, I suffered from virtual memory and received reports saying that our products will be restarted from time to time, and the report said that "the memory used exceeds 5 GB ". Restarting is the mechanism of our product. We will monitor the memory, perform GC and restart the application beyond a certain limit, but it is too exaggerated to exceed 5 GB, the

JVM memory structures such as The Java heap, which is the largest piece of memory managed by a Java virtual machine. The Java heap is a piece of memory that is shared by all threads and created when the virtual machine is

Java thread working memory and main memory variable exchange process and volatile keyword understanding1. The Java memory model specifies that in multi-threaded situations, threads manipulate main memory variables and require copi

: Java heap space at com.jvm.exception.HeapSpaceException.main(HeapSpaceException.java:13) In the memory, the system first prompts an OutOfMemoryError to upgrade the Java heap space. Generally, Memory analysis tools such as Eclipse Memory

Overview of Java Garbage collection Java GC (Garbage Collection, garbage collection, garbage collector) mechanism, is one of the main differences between Java and C++/C, as Java developers, generally do not need to write memory and garbage cleaning code,

Java obtains information about JVM memory and physical memory. 1 package com. sysinfo; 2 public class MonitorInfo {3/** jvm memory available. */4 private long totalMemory; 5 6/** jvm memory remaining. */7 private long freeMemory; 8 9/** maximum

First, overview:　　　　A Java Virtual machine executes a Java program by dividing the memory it manages into several different data regions that have their own purpose and creation and destruction times, some of which follow the startup of the virtual machine process, and some that depend on the start and end of the user thread to build and destroy.Second, the progr

one, written in front of the words Keyword volatile can be said to be the Java Virtual Machine provides the most lightweight synchronization mechanism, but it is not easy to be completely correct and complete understanding, so many programmers are accustomed to not to use it, encountered in the need to deal with multi-threaded data competition problems when the general use of synchronized to synchronize. Understanding the semantics of volatile variabl

Stack memoryThe stack memory stores a variable of the base type (int a = 3;) and a variable of the reference type (car car). When a variable is defined in a block of code, Java allocates memory space for the variable in the stack, and when the scope of the variable is exceeded, Java automatically frees the

The answer is heap memory.Before clearly reading the Java class initialization process,But suddenly see such a topic, still ignorant.After Baidu, those post reply each have each say,The head can see the fortress live, or read the book to prove it.The 128th page of Li Gang's crazy Java begins with a class that starts with initialization,The detailed process of what happens in

Reentrantlock in the fair lock and unfair lock as a case analysis, interested students can read the origin and source. It is summarized as follows: When a fair lock and an unfair lock are released, the last one is to write a volatile variable state. Fair lock Fetch Yes, first read the volatile variable. When a non-fair lock is acquired, the volatile variable is first updated with CAs, which has the memory semantics of both volatile r

Deep Java core Java memory allocation principle explainingIntroduction: Stack, heap, Chang, although the same is the Java memory allocation operation area, but its scope of application and function is very different. This article will delve into the

This article is from the "in-depth understanding of Java Virtual Machine," a book, it is very recommended that you look at this book. Recently began to read this book, intends to open a series of related, to summarize the book's important points of knowledge. Uh, uh, well, that picture request framework is not urgent, because this request framework design content is relatively broad, the current spare time is being prepared, and then will be put up. B

One: ConceptThe Java programming language divides memory into two types, called stack memory, which is called heap memory.The Java heap is a run-time data area in which the objects of the class allocate space. These objects are created with the new directive, and they do not require program code to be explicitly releas