Module jdk.management
Package com.sun.management

# Interface OperatingSystemMXBean

All Superinterfaces:
  `OperatingSystemMXBean`, `PlatformManagedObject`

All Known Subinterfaces:
  `UnixOperatingSystemMXBean`

public interface OperatingSystemMXBean extends OperatingSystemMXBean
Platform-specific management interface for the operating system on which the Java virtual machine is running.

This interface provides information about the operating environment on which the Java virtual machine is running. That might be a native operating system, a virtualized operating system environment, or a container-managed environment.

The `OperatingSystemMXBean` object returned by `ManagementFactory.getOperatingSystemMXBean()` is an instance of the implementation class of this interface or `UnixOperatingSystemMXBean` interface depending on its underlying operating system.

Since:
  1.5

- ## Method Summary

  Modifier and Type
  Method
  Description
  `long`
  `getCommittedVirtualMemorySize()`
  Returns the amount of virtual memory that is guaranteed to be available to the running process in bytes, or `-1` if this operation is not supported.
  `double`
  `getCpuLoad()`
  Returns the "recent cpu usage" for the operating environment.
  `long`
  `getFreeMemorySize()`
  Returns the amount of free memory in bytes.
  `default long`
  `getFreePhysicalMemorySize()`
  Deprecated.
  Use `getFreeMemorySize()` instead of this historically named method.
  `long`
  `getFreeSwapSpaceSize()`
  Returns the amount of free swap space in bytes.
  `double`
  `getProcessCpuLoad()`
  Returns the "recent cpu usage" for the Java Virtual Machine process.
  `long`
  `getProcessCpuTime()`
  Returns the CPU time used by the process on which the Java virtual machine is running in nanoseconds.
  `default double`
  `getSystemCpuLoad()`
  Deprecated.
  Use `getCpuLoad()` instead of this historically named method.
  `long`
  `getTotalMemorySize()`
  Returns the total amount of memory in bytes.
  `default long`
  `getTotalPhysicalMemorySize()`
  Deprecated.
  Use `getTotalMemorySize()` instead of this historically named method.
  `long`
  `getTotalSwapSpaceSize()`
  Returns the total amount of swap space in bytes.

  ### Methods declared in interface java.lang.management.OperatingSystemMXBean

  `getArch, getAvailableProcessors, getName, getSystemLoadAverage, getVersion`

  ### Methods declared in interface java.lang.management.PlatformManagedObject

  `getObjectName`

- ## Method Details

  - ### getCommittedVirtualMemorySize

    long getCommittedVirtualMemorySize()
    Returns the amount of virtual memory that is guaranteed to be available to the running process in bytes, or `-1` if this operation is not supported.
    Returns:
      the amount of virtual memory that is guaranteed to be available to the running process in bytes, or `-1` if this operation is not supported.

  - ### getTotalSwapSpaceSize

    long getTotalSwapSpaceSize()
    Returns the total amount of swap space in bytes.
    Returns:
      the total amount of swap space in bytes.

  - ### getFreeSwapSpaceSize

    long getFreeSwapSpaceSize()
    Returns the amount of free swap space in bytes.
    Returns:
      the amount of free swap space in bytes.

  - ### getProcessCpuTime

    long getProcessCpuTime()
    Returns the CPU time used by the process on which the Java virtual machine is running in nanoseconds. The returned value is of nanoseconds precision but not necessarily nanoseconds accuracy. This method returns `-1` if the the platform does not support this operation.
    Returns:
      the CPU time used by the process in nanoseconds, or `-1` if this operation is not supported.

  - ### getFreePhysicalMemorySize

    @Deprecated(since="14") default long getFreePhysicalMemorySize()
    Deprecated.
    Use `getFreeMemorySize()` instead of this historically named method.
    Returns the amount of free physical memory in bytes.
    Implementation Requirements:
      This implementation must return the same value as `getFreeMemorySize()`.
    Returns:
      the amount of free physical memory in bytes.

  - ### getFreeMemorySize

    long getFreeMemorySize()
    Returns the amount of free memory in bytes.
    Returns:
      the amount of free memory in bytes.
    Since:
      14

  - ### getTotalPhysicalMemorySize

    @Deprecated(since="14") default long getTotalPhysicalMemorySize()
    Deprecated.
    Use `getTotalMemorySize()` instead of this historically named method.
    Returns the total amount of physical memory in bytes.
    Implementation Requirements:
      This implementation must return the same value as `getTotalMemorySize()`.
    Returns:
      the total amount of physical memory in bytes.

  - ### getTotalMemorySize

    long getTotalMemorySize()
    Returns the total amount of memory in bytes.
    Returns:
      the total amount of memory in bytes.
    Since:
      14

  - ### getSystemCpuLoad

    @Deprecated(since="14") default double getSystemCpuLoad()
    Deprecated.
    Use `getCpuLoad()` instead of this historically named method.
    Returns the "recent cpu usage" for the whole system. This value is a double in the [0.0,1.0] interval. A value of 0.0 means that all CPUs were idle during the recent period of time observed, while a value of 1.0 means that all CPUs were actively running 100% of the time during the recent period being observed. All values betweens 0.0 and 1.0 are possible depending of the activities going on in the system. If the system recent cpu usage is not available, the method returns a negative value.
    Implementation Requirements:
      This implementation must return the same value as `getCpuLoad()`.
    Returns:
      the "recent cpu usage" for the whole system; a negative value if not available.
    Since:
      1.7

  - ### getCpuLoad

    double getCpuLoad()
    Returns the "recent cpu usage" for the operating environment. This value is a double in the [0.0,1.0] interval. A value of 0.0 means that all CPUs were idle during the recent period of time observed, while a value of 1.0 means that all CPUs were actively running 100% of the time during the recent period being observed. All values betweens 0.0 and 1.0 are possible depending of the activities going on. If the recent cpu usage is not available, the method returns a negative value.
    Returns:
      the "recent cpu usage" for the whole operating environment; a negative value if not available.
    Since:
      14

  - ### getProcessCpuLoad

    double getProcessCpuLoad()
    Returns the "recent cpu usage" for the Java Virtual Machine process. This value is a double in the [0.0,1.0] interval. A value of 0.0 means that none of the CPUs were running threads from the JVM process during the recent period of time observed, while a value of 1.0 means that all CPUs were actively running threads from the JVM 100% of the time during the recent period being observed. Threads from the JVM include the application threads as well as the JVM internal threads. All values betweens 0.0 and 1.0 are possible depending of the activities going on in the JVM process and the whole system. If the Java Virtual Machine recent CPU usage is not available, the method returns a negative value.
    Returns:
      the "recent cpu usage" for the Java Virtual Machine process; a negative value if not available.
    Since:
      1.7