Java Memory Area && OOM VM运行时数据区域: 1.程序计数器(Program Counter Register) 每一个Java线程都有一个程序计数器来用于保存程序执行到当前方法的哪一个指令,对于非Native方法,这个区域记录的是正在执行的VM原语的地址,如果正在执行的是Natvie方法,这个区域则为空(undefined)。此内存区域是唯一一个在VM Spec...
Internedjava.lang.Stringobjects are also stored in the permanent generation. Thejava.lang.Stringclass maintains a pool of strings. When the intern method is invoked, the method checks the pool to see if an equivalent string is present. If so, it’s returned by the intern method; if not, ...
voidenter(java.lang.Runnable logic) Associate this memory area with the current schedulable object for the duration of the execution of therun()method of the givenRunnable. voidexecuteInArea(java.lang.Runnable logic) Execute the run method from thelogicparameter using this memory area as the curr...
JVM规范对Java运行时的内存划定了几块区域(详见这里),有:JVM栈(Java Virtual Machine Stacks)、堆(Heap)、方法区(Method Area)、常量池(Runtime Constant Pool)、本地方法栈(Native Method Stacks),但对各块区域的内存布局和地址空间却没有明确规定,而留给各JVM厂商发挥的空间。 HotSpot JVM Sun自家的HotSpot JVM...
Section Size [MB] Area Total [mb] 168.7 All Others [mb] 3.1 Other dev + Unknown Code [mb] 28 mmaps Stack [mb] 0.1 Stack Graphics [mb] 88.7 Gfxdev + EGL mtrack + GL mtrack Native [mb] 40.8 Native Heap Java [mb] 8 Dalvik Heap Plugins Usually, most of the memory goes into the...
http://localhost:8080/actuator/metrics/jvm.memory.used?tag=area:heap code4it 2024/01/19 2310 全网最硬核 JVM 内存解析 - 12.元空间各种监控手段 jvm监控内存事件数据 通过jcmd <pid> VM.metaspace 命令可以查看对应 JVM 进程的元空间当前的详细使用情况,返回内容是: 干货满满张哈希 2023/05/01 1K0 6款...
说到这里,对常量池中的字符串值的存储位置应该有一个比较明了的理解了。在程序执行的时候,常量池会储存在Method Area,而不是堆中。常量池中保存着很多String对象; 并且可以被共享使用,因此它提高了效率 二、案例解析 总结: 1.String类初始化后是不可变的(immutable)...
In this tutorial, we saw how the JVM lays out objects and arrays in the heap. For a more detailed exploration, it’s highly recommended to check out theoops section of the JVMsource code. Also,Aleksey Shipilëvhas a much morein-depth articlein this area. ...
A cache is an area of localmemorythat holds a copy of frequently accessed data that is otherwise expensive to get or compute. Examples of such data include a result of a query to a database, a disk file or a report. Lets look at creating and using a simplethread-safeJava in-memory ...
JVM规范对Java运行时的内存划定了几块区域(详见这里),有:JVM栈(Java Virtual Machine Stacks)、堆(Heap)、方法区(Method Area)、常量池(Runtime Constant Pool)、本地方法栈(Native Method Stacks),但对各块区域的内存布局和地址空间却没有明确规定,而留给各JVM厂商发挥的空间。