java memory profiler

The JVM system mainly consists of the following parts:class loader, execution engine, memory area, local method call.The memory area generally refers to the run-time data area, below summarizes what content and function are stored in the following sections: Program counter (PC Register):Thread Private. is a small piece of memory that can be seen as the line numbe

A thread-private area of memory is reclaimed as the user thread ends, the memory allocation compilation period is determined, and memory allocation and reclamation are deterministic. Shared threads are created and destroyed as virtual machines start, end, and are dynamically allocated at run time. The garbage collector primarily collects garbage collection for sh

Java Virtual Machine (2) automatic memory management mechanism, Java Virtual Machine1. Summary In the deep understanding of Java Virtual Machine (JVM) study Note 1 Automatic Memory Management Mechanism (I), we listed the following issues:This article mainly summarizes questi

After running java, the control of memory is handed over to the java Virtual Machine. When executing a java program, the java Virtual Machine divides the memory it manages into several different data regions. The runtime

When a Java program starts running as a process in the operating system, what parts of the process need to allocate memory?1 Java HeapThe Java heap is used to store Java objects, and the size of the heap is applied to the operating system once at the start of the JVM, using-

1. Use new to create objects, allocate object space in heap memory, initialize;2. Define a local variable in the method stack and eat a reference to the object in the heap memory;3. The method executes the return, the stack memory is freed automatically, the local variable destroys;4. If the heap in-memory object does

12th Java memory model and threadingJava memory modelMain memory vs. working memory:The Java memory model specifies that all variables are in main memory, and each thread has its own wo

Understanding the benefits of the Java Virtual Machine memory mechanismWhen we need to solve some tricky problems, such as performance optimization, to solve the oom anomaly, if we understand the memory mechanism of the Java Virtual machine, we know where to begin to deal with these problems.How to understand me from t

Directory Java Garbage Collection Overview Java Memory Area How Java objects are accessed Java memory allocation mechanism Java GC Mechanism Garbage collect

when Tomcat memory needs to be increased? At this point, we need to manually modify some Tomcat files. After reading a lot of online materials, I used to modify the content of the Set java_opts =-xms512m-xmx512m // indicates that the minimum available memory for initialization and the maximum available memory are both 512 MB (modify the corresponding value) For

Directory Java Garbage Collection Overview Java Memory Area How Java objects are accessed Java memory allocation mechanism Java GC Mechanism Garbage collect

data, and if that happens, whose cache data will be synchronized back to main memory? In order to solve the problem of consistency, the need for each processor to access the cache is followed by a number of protocols, when read and write according to the protocol to operate, such protocols are MSI, MESI (Illinois Protocol), MOSI, Synapse, Firefly and Dragon Protocol and so on. The term "memory model", whic

Java memory model Jmmjava memory model definitionThe previous article we talked about CPU cache consistency and memory barrier issues. So Java as a cross-platform language, its implementation to face different underlying hardware systems, design a middle-tier model to shield

Java memory overflow and java Overflow Program countersA program counter is a small piece of memory, which is private to the thread and can be seen as a counter for executing bytecode in the current thread. In the virtual machine conceptual model, the bytecode interpreter uses this counter to find the next command t

Java learning notes (4): memory management, java learning notes In terms of memory, Java itself has a spam mechanism, which seems to be negligible on the surface, but if we understand it, it may sometimes get twice the result with half the effort. So I took some time to sort

Java Memory Management mechanismIn the C + + language, if you need to allocate a chunk of memory dynamically, programmers need to be responsible for the entire life cycle of this memory. From the application assignment, to the use, to the final release. The process is very flexible, but cumbersome, and the programmer i

16th Chapter Java Memory modelFinally see the last chapter of the book, Hey, after the English version of the book to double-turn. This book avoids the underlying details of the Java memory Model (JMM) as much as possible, and focuses on high-level design issues, such as security releases, synchronization strategies, a

"hotspot code probing" technologyJoined the Sun (Oracle) JDK from JDK1.2 and became the default implementation of the Sun (Oracle) JDK at JDK1.3, becoming the only virtual machine in 1.4Started open source at the end of 2006, and the OPENJDK project was establishedShared design, private implementationThe memory areas covered in this course are the conceptual models defined in the Java Virtual Machine speci

to introduce you to the GC mechanism in a simple way. I hope these articles will help you. In fact, my students have published some very good articles about the Java kernel on Twitter and are popular. If you are interested, you can also follow them.Back to the point, let's talk about garbage collection, before you learn the GC, you should first remember a word: "stop-the-world". Stop-the-world will occur in any GC algorithm. Stop-the-world means that