当前位置:首页 > 数码 > Java生产环境下性能监控与调优全面详解 (java生产者消费者代码)

Java生产环境下性能监控与调优全面详解 (java生产者消费者代码)

admin1个月前 (04-22)数码16

Overview

The heap is the largest memory space in the Java Virtual Machine (JVM) and is shared among all threads. It holds most of the objects and arrays created by the application. The heap is divided into the following regions:
  • Young generation: This region is further divided into three subregions:
    • Eden space: Where new objects are initially allocated
    • Survivor space: Where objects that survive garbage collection cycles are promoted
    • From Survivor space: A temporary space used during garbage collection
    • To Survivor space: A temporary space used during garbage collection
    java生产者消费者代码
  • Old generation: Wherelong-lived objects are stored
In Java 6 and earlier versions, the heap also included a permanent generation, which held metadata such as class definitions and constant pools. In Java 7, the permanent generation was merged into the heap, and in Java 8, it was replaced by the Metaspace, which is part of the non-heap memory.

Allocation and Garbage Collection

Objects are allocated in the Eden space. When the Eden space is full, a minor garbage collection (GC) cycle is triggered. During a minor GC, objects that are still reachable (still referenced by other objects) are promoted to the Survivor space. Objects that are not reachable are removed from the heap. The Survivor space is divided into two subspaces, From Survivor and To Survivor. During a minor GC, objects are copied from the Eden space to the From Survivor space. During the next minor GC, objects are copied from the From Survivor space to the To Survivor space. Objects that survive multiple minor GC cycles are promoted to the old generation. The old generation is where long-lived objects are stored. When the old generation is full, a major GC cycle is triggered. During a major GC,all objects in the old generation are marked as unreachable and removed from the heap.

Tuning Heap Memory

The size of the heap memory can be tuned to improve performance. The following parameters can be used to tune the heap memory:
  • -Xms: Sets the initial size of the heap
  • -Xmx: Sets the maximum size of the heap
  • -XX:NewSize: Sets the initial size of the young generation
  • -XX:MaxNewSize: Sets the maximum size of the young generation
  • -XX:SurvivorRatio: Sets the ratio of the Survivor space to the Eden space

Monitoring Heap Memory

The heap memory can be monitored using various tools, such as:
  • jconsole: A graphical tool that provides real-time monitoring of the JVM
  • jvisualvm: A visual tool that provides advanced monitoring and profiling capabilities
  • VisualVM: A third-party tool that provides comprehensive monitoring and profiling features

Conclusion

The Java heap memory is a critical part of the JVM and plays a central role in object allocation and garbage collection. By understanding the structure and management of the heap memory, developers can tune their applications to improve performance and avoid memory-related problems.

《Java性能权威指南》txt下载在线阅读全文,求百度网盘云资源

《Java性能权威指南》(奥克斯 (Scott Oaks))电子书网盘下载免费在线阅读

链接:奥克斯-(Scott-Oaks)-Java性能权威指南

java中,生产环境服务器变慢,如何诊断处理?

生产环境应当有负责监控项目的一些系统。 例如,kibana上可以查看哪些接口的响应时间比较长。 数据库监控可以看到有没有慢查询,有的话去找运维要一下具体的慢查询语句,然后去分析这个慢查询产生的时间和都有哪些接口被调用了。 去看这些接口的响应时间哪个能对的上。 定位到对应的代码,进行优化。 这个是个人认为比较常见的一种情况。

免责声明:本文转载或采集自网络,版权归原作者所有。本网站刊发此文旨在传递更多信息,并不代表本网赞同其观点和对其真实性负责。如涉及版权、内容等问题,请联系本网,我们将在第一时间删除。同时,本网站不对所刊发内容的准确性、真实性、完整性、及时性、原创性等进行保证,请读者仅作参考,并请自行核实相关内容。对于因使用或依赖本文内容所产生的任何直接或间接损失,本网站不承担任何责任。

标签: Java

“Java生产环境下性能监控与调优全面详解 (java生产者消费者代码)” 的相关文章

深入探讨-Java-编程中的类继承与接口实现 (深入探讨交流)

深入探讨-Java-编程中的类继承与接口实现 (深入探讨交流)

简介 类索引、父类索引和接口索引是在 Class 文件中用于确定类的继承关系的重要数据。通过这些索引,Java 虚拟机 (JVM) 可以准确地建立类之间的继承关系,实现多态性和接口的实现。...

大编程趋势-5-年-Java-2024-开发者的 (编程是大趋势吗)

大编程趋势-5-年-Java-2024-开发者的 (编程是大趋势吗)

Java 作为编程领域的支柱,拥有超过 900 万开发人员和超过 30 年的发展历史。它以其先进的安全功能、优越的性能和跨平台开发能力而闻名。展望 2024 年,Java 正准备进行一场突破性的转...

选择性-过多的关键词会增加SEO工作的复杂性-关键词不应过多 (选择性太多)

选择性-过多的关键词会增加SEO工作的复杂性-关键词不应过多 (选择性太多)

引言 在不断演进的软件开发领域,保持最新技术至关重要。从 Java 11 迁移到 Java 21 是一个明智的决定,它带来了显着的优势和创新,可以提升应用程序的安全性、性能和开发效率。...

Java循环结构与实现方式 (java循环语句案例)

Java循环结构与实现方式 (java循环语句案例)

循环简介 循环是编程中常用的一种控制结构,用于重复执行某一段代码或操作。循环的执行需要满足一定的条件,当条件满足时,循环会一直执行,直到条件不满足时才结束。所以循环其实就是重复地完成某一件事...

Java-Lambda-表白式的多面运行-从基础到初级 (java类的定义和使用)

Java-Lambda-表白式的多面运行-从基础到初级 (java类的定义和使用)

Lambda表白式是8中引入的最有影响力的性能之一。它们经过准许繁复而优雅地创立匿名函数来成功Java中的函数式编程。在这篇博文中,咱们将讨论编写lambda表白式的各种方式。 概述...

助推高性能运行程序开发-革命性的并发编程处置打算-的虚构线程-Java-21 (高性能运作有什么用)

助推高性能运行程序开发-革命性的并发编程处置打算-的虚构线程-Java-21 (高性能运作有什么用)

21最关键的个性之一就是虚构线程(JEP444)。这些轻量级的线程降落了编写、保养和观察高吞吐量并行运行所需的致力。 在探讨新个性之前,让咱们先看一下以后的形态,以便更好地理解它试图处置什么...

在-Java-年依然盛行的-2023-25-个要素 (在javascript中)

在-Java-年依然盛行的-2023-25-个要素 (在javascript中)

译者|刘汪洋 审校|重楼 学习的环节中,我看法到在90年代末OOP正值鼎盛期间,Java作为能够真正成功这些概念的言语显得尤为突出(虽然我此前学过C++,但相比Java影响较小)。我特...

消除反复编译困扰-优化效率-释放Java开发潜能 (消除反复编译命令)

消除反复编译困扰-优化效率-释放Java开发潜能 (消除反复编译命令)

在开发过程中,反复编译是一个常见的问题,特别是在大型项目或者需要频繁修改代码的情况下。每次修改代码后都需要重新编译整个项目,这样耗费了大量的时间和资源,降低了开发效率。为了解决这个问题,我们可以采...