how to monitor java memory usage

JMX-based connection to a running JVM that launches com.sun.management.jmxremote to implement the default JMX management client.1) OverviewThe overview interface provides real-time visibility into the heap memory usage, threads, classes, and CPU usage of Java applications.2) MemoryThe

program, if the-xmx parameter is not added, it is 64 mb. That is to say, maxmemory () returns about 64*1024*1024 bytes, this is the maximum memory that the Java Virtual Machine can dig from the operating system by default. If the-xmx parameter is added, the value following this parameter prevails. For example, Java-CP classpath-xmx512m classname, the maximum

. In order to optimize GC, it is best to make-xmn value approximately equal to 1/3 of-XMX.2. A GUI program is best to run a GC every 10-20 seconds, each time within half a second. Attention: 1. Increasing the size of the heap decreases the frequency of the GC, but it also increases the time of each GC. And when the GC runs, all the user threads are paused, that is, during the GC, the Java application does not do any work.2. The heap size does not dete

. In order to optimize GC, it is best to make-xmn value approximately equal to 1/3 of-XMX.2. A GUI program is best to run a GC every 10-20 seconds, each time within half a second. Attention: 1. Increasing the size of the heap decreases the frequency of the GC, but it also increases the time of each GC. And when the GC runs, all the user threads are paused, that is, during the GC, the Java application does not do any work.2. The heap size does not dete

I have made some optimizations on the memory usage of the program recently, and have achieved good results. I have summarized some experiences. I believe it will be helpful for you to write high-quality programs. The following discussion is not applicable to 64-bit systems for 32-bit systems. You often write a program, test it, and have no function problems. When you check that the

optimize GC, it is best to make-xmn value approximately equal to 1/3 of-XMX.2. A GUI program is best to run a GC every 10-20 seconds, each time within half a second.Attention:1. Increasing the size of the heap decreases the frequency of the GC, but it also increases the time of each GC. And when the GC runs, all the user threads are paused, that is, during the GC, the Java application does not do any work.2. The heap size does not determine the amoun

within half a second.Attention:1. Increasing the size of the heap decreases the frequency of the GC, but it also increases the time of each GC. And when the GC runs, all the user threads are paused, that is, during the GC, the Java application does not do any work.2. The heap size does not determine the amount of memory used by the process. The memory

Memory management in Java is divided into two areas:Memory allocation: Refers to the memory space allocated by the JVM to the object in the heap space when a Java object is created.Memory reclamation: When a Java object loses its reference and becomes garbage, the garbage co

Previously we introduced:Oracle 10 Gb Memory StructureThis article describes the knowledge and usage of the Sharing pool, including:Program global Zone,Sorting area,Java poolAnd so on. Next we will introduce this part. Program global Zone The global area of the program is the memory area that contains data and control

optimize GC, it is best to make-xmn value approximately equal to 1/3 of-XMX.2. A GUI program is best to run a GC every 10-20 seconds, each time within half a second.Attention:1. Increasing the size of the heap decreases the frequency of the GC, but it also increases the time of each GC. And when the GC runs, all the user threads are paused, that is, during the GC, the Java application does not do any work.2. The heap size does not determine the amoun

A bug-filled world view-Java Memory leakage In addition to checking the code carefully, memory leakage is not a good method. First, check the gc log to check whether the memory is leaked, rather than the memory is insufficient. Memory