Method to get the JVM parameter in the java code
- 2020-06-01 09:43:45
- OfStack
Examples are as follows:
MemoryMXBean memorymbean = ManagementFactory.getMemoryMXBean();
MemoryUsage usage = memorymbean.getHeapMemoryUsage();
System.out.println("INIT HEAP: " + usage.getInit());
System.out.println("MAX HEAP: " + usage.getMax());
System.out.println("USE HEAP: " + usage.getUsed());
System.out.println("\nFull Information:");
System.out.println("Heap Memory Usage: "
+ memorymbean.getHeapMemoryUsage());
System.out.println("Non-Heap Memory Usage: "
+ memorymbean.getNonHeapMemoryUsage());
List<String> inputArguments = ManagementFactory.getRuntimeMXBean().getInputArguments();
System.out.println("===================java options=============== ");
System.out.println(inputArguments);
System.out.println("======================= through java To get the relevant system state ============================ ");
int i = (int)Runtime.getRuntime().totalMemory()/1024;//Java The amount of memory in a virtual machine , In bytes
System.out.println(" Total memory i is "+i);
int j = (int)Runtime.getRuntime().freeMemory()/1024;//Java The amount of free memory in a virtual machine
System.out.println(" Free memory j is "+j);
System.out.println(" Maximum memory is "+Runtime.getRuntime().maxMemory()/1024);
System.out.println("=======================OperatingSystemMXBean============================ ");
OperatingSystemMXBean osm = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
// System.out.println(osm.getFreeSwapSpaceSize()/1024);
// System.out.println(osm.getFreePhysicalMemorySize()/1024);
// System.out.println(osm.getTotalPhysicalMemorySize()/1024);
// Get information about the operating system
System.out.println("osm.getArch() "+osm.getArch());
System.out.println("osm.getAvailableProcessors() "+osm.getAvailableProcessors());
//System.out.println("osm.getCommittedVirtualMemorySize() "+osm.getCommittedVirtualMemorySize());
System.out.println("osm.getName() "+osm.getName());
//System.out.println("osm.getProcessCpuTime() "+osm.getProcessCpuTime());
System.out.println("osm.getVersion() "+osm.getVersion());
// Gets the entire virtual machine memory usage
System.out.println("=======================MemoryMXBean============================ ");
MemoryMXBean mm=(MemoryMXBean)ManagementFactory.getMemoryMXBean();
System.out.println("getHeapMemoryUsage "+mm.getHeapMemoryUsage());
System.out.println("getNonHeapMemoryUsage "+mm.getNonHeapMemoryUsage());
// Get the various states of each thread, CPU Occupancy, and the state of threads throughout the system
System.out.println("=======================ThreadMXBean============================ ");
ThreadMXBean tm=(ThreadMXBean)ManagementFactory.getThreadMXBean();
System.out.println("getThreadCount "+tm.getThreadCount());
System.out.println("getPeakThreadCount "+tm.getPeakThreadCount());
System.out.println("getCurrentThreadCpuTime "+tm.getCurrentThreadCpuTime());
System.out.println("getDaemonThreadCount "+tm.getDaemonThreadCount());
System.out.println("getCurrentThreadUserTime "+tm.getCurrentThreadUserTime());
// Current compiler condition
System.out.println("=======================CompilationMXBean============================ ");
CompilationMXBean gm=(CompilationMXBean)ManagementFactory.getCompilationMXBean();
System.out.println("getName "+gm.getName());
System.out.println("getTotalCompilationTime "+gm.getTotalCompilationTime());
// Gets the usage of multiple memory pools
System.out.println("=======================MemoryPoolMXBean============================ ");
List<MemoryPoolMXBean> mpmList=ManagementFactory.getMemoryPoolMXBeans();
for(MemoryPoolMXBean mpm:mpmList){
System.out.println("getUsage "+mpm.getUsage());
System.out.println("getMemoryManagerNames "+mpm.getMemoryManagerNames().toString());
}
// To obtain GC How often and how long it took
System.out.println("=======================MemoryPoolMXBean============================ ");
List<GarbageCollectorMXBean> gcmList=ManagementFactory.getGarbageCollectorMXBeans();
for(GarbageCollectorMXBean gcm:gcmList){
System.out.println("getName "+gcm.getName());
System.out.println("getMemoryPoolNames "+gcm.getMemoryPoolNames());
}
// Get runtime information
System.out.println("=======================RuntimeMXBean============================ ");
RuntimeMXBean rmb=(RuntimeMXBean)ManagementFactory.getRuntimeMXBean();
System.out.println("getClassPath "+rmb.getClassPath());
System.out.println("getLibraryPath "+rmb.getLibraryPath());
System.out.println("getVmVersion "+rmb.getVmVersion());