下面是一个使用mermaid语法标识的状态图,展示了查看进程内存大小的流程: StartGetMemoryMXBeanGetHeapMemoryUsageGetNonHeapMemoryUsagePrintMemoryUsage 参考资料 [MemoryMXBean - Java Doc]( [ManagementFactory - Java Doc]( [How to get current memory usage in Jav...
publicclassMemoryUsageExample{publicstaticvoidmain(String[]args){// 步骤1: 获取当前线程的引用ThreadcurrentThread=Thread.currentThread();// 步骤2: 获取线程的内存使用情况Runtimeruntime=Runtime.getRuntime();// 步骤3: 计算总内存和已使用内存longtotalMemory=runtime.totalMemory();longusedMemory=totalMemor...
%ni：表示用户空间且通过nice调度过的程序的cpu使用率。 %id：空闲cpu %wa：cpu运行时在等待io的...
public longgetFreeMemory() { return freeMemory; } public voidsetFreeMemory(long freeMemory) { this.freeMemory = freeMemory; } public longgetFreePhysicalMemorySize() { return freePhysicalMemorySize; } public voidsetFreePhysicalMemorySize(long freePhysicalMemorySize){ this.freePhysicalMemorySize =fre...
long usedMemorySize = memoryUsage.getUsed(); //已使用的内存 方式二：Runtime rt = Runtime.getRuntime();long totalMemorySize = rt.totalMemory(); //初始的总内存 long maxMemorySiz = t.maxMemory(); //最大可用内存 long freeMemorySize = rt.freeMemory(); //当前可用内存 需要说明...
调优参数务必加上-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=,发生OOM让JVM自动dump出内存,方便后续分析问题解决问题 堆内存不要设置的特别大,因为你设置的特别大,发生OOM时生成的dump文件就特别大,不好分析。建议不超过8G。 想主动dump出JVM的内存,有挺多方式,但不管哪种方式,主动dump内存会引发STW,请...
一、javah命令(C Header and Stub File Generator) 二、jps命令(JavaVirtual Machine Process Status Tool) 三、jstack命令(Java Stack Trace) 四、jstat命令(Java Virtual Machine Statistics Monitoring Tool) 五、jmap命令(Java Memory Map) 六、jinfo命令(Java Configuration Info) 七、jconsole命令(Java Monitoring...
MemoryManagerMXBean MemoryMXBean MemoryNotificationInfo MemoryPoolMXBean MemoryType MemoryUsage Menu MenuBar MenuBarUI MenuComponent MenuContainer MenuDragMouseEvent MenuDragMouseListener MenuElement MenuEvent MenuItem MenuItemUI MenuKeyEvent MenuKeyListener MenuListener MenuSelectio...
java程序实现获取计算机cpu利用率和内存使用信息(Java program to achieve the computer CPU utilization and memory usage information).doc,java程序实现获取计算机cpu利用率和内存使用信息(Java program to achieve the computer CPU utilization and memory usage inf
上面的代码截取自create_vm函数,DisableAttachMechanism、StartAttachListener和ReduceSignalUsage这三个变量默认都是false,所以AttachListener::init();这行代码不会在create_vm的时候执行,而vm_start会执行。下面来看一下这个函数的实现细节: void AttachListener::vm_start() {charfn[UNIX_PATH_MAX];structstat64st;...