jvm memory management

to store data such as incoming parameters, temporary variables, and return addresses of functions. Unused extents are prestaged areas that allocate new memory space.Second, process and JVM memory modelThe JVM is essentially a process, so its memory model also has the genera

value and-xx:maxpermsize must be greater than 25.6M ===================================Ultimately, it depends on the exact configuration of your machine.Please refer to the following article in the configuration barThere is a Eclipse.ini file under the Eclipse folderxms128m-xmx512m-xx:permsize=64m-xx:maxpermsize=128m Here are a few questions: 1. What are the meanings of each parameter? 2. Why do some machines I set-xmx and-xx:maxpermsize to 512M after eclipse can be started, and some machines w

class execution mechanism The JVM executes class bytecode based on the stack architecture, and after the thread is created, the program counter (PC) and stack (stack) are generated. The PC holds the offset of the next executed instruction within the method, the stack holds a stack frame, each stack frame corresponds to each call of each method, and the stack frame holds local variables and the operand stack The structure of the stack

allocate new memory space.Second, process and JVM memory modelThe JVM is essentially a process, so its memory model also has the general characteristics of the process. However, the JVM is not a normal process, it has many new fe

are prestaged areas that allocate new memory space.Second, process and JVM memory modelThe JVM is essentially a process, so its memory model also has the general characteristics of the process. However, the JVM is not a normal pr

From: http://hi.baidu.com/fvsd3/blog/item/9baec09a301bdebcc9eaf4a2.html I. JVM memory area composition Java divides memory into four types:1. Stack segment: automatically assigned and released by the compiler, stores function parameter values, local variable values, and so on. After the specific method is executed, the system automatically releases

1, memory management Simple Introduction1, why should I have memory management? malloc selloc dealloc ' need to go back to reviewThe general memory 4s is 512m memory; 6 is 1024m memory;

, and the young generation and the old are the real heap areas that the Java program uses, That's what we often say. But the heap and the heap at this point are very different: when you call the malloc function of a C program, it causes a system-level call, and when you use the free function to release memory, it also causes a system-level call, but the heap area in the JVM is not: The

Reference: http://oldblog.csdn.net/column/details/16384.html In "Fortress besieged" in a sentence, "people outside the wall want to go in, the wall inside people think out", use this to describe between Java and C + + This memory dynamic allocation and garbage collection technology surrounded by the "wall" is more appropriate. For developers engaged in C, C + +, in the area of memory

When reading this article, at least first of all, the concept of the JVM, working principle, structure composition, have certain basic understanding, the nonsense does not say much, this article is straight to the point, directly to work more common concepts: class, Class object, instance object, static method, Non-static method, static attribute, non-static attribute, etc. directly into the use and allocation of