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
java.
is an instance of the implementation class of this interface
or UnixOperatingSystemMXBean interface depending on
its underlying operating system.
| Modifier and Type | Method and Description |
|---|---|
| public long | 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 |
| public double | Returns: the "recent cpu usage" for the whole operating environment; a negative value if not available.Returns the "recent CPU usage" for the operating environment. |
| public long | Returns: the amount of free memory in bytes.Returns the amount of free memory in bytes. |
| public default long | Returns: the amount of free physical memory in bytes.
Deprecated
since 14. Use
getFreeMemorySize() instead of
this historically named method.
Returns the amount of free physical memory in bytes. |
| public long | Returns: the amount of free swap space in bytes.Returns the amount of free swap space in bytes. |
| public double | Returns: the "recent cpu usage" for the Java Virtual Machine process; a negative value if not available.Returns the "recent CPU usage" for the Java Virtual Machine process. |
| public long | Returns: the CPU time used by the process in nanoseconds, or-1 if this operation is not supported.Returns the CPU time used by the process on which the Java virtual machine is running in nanoseconds. |
| public default double | Returns: the "recent cpu usage" for the whole system; a negative value if not available.
Deprecated
since 14. Use
getCpuLoad() instead of
this historically named method.
Returns the "recent CPU usage" for the whole system. |
| public long | Returns: the total amount of memory in bytes.Returns the total amount of memory in bytes. |
| public default long | Returns: the total amount of physical memory in bytes.
Deprecated
since 14. Use
getTotalMemorySize() instead of
this historically named method.
Returns the total amount of physical memory in bytes. |
| public long | Returns: the total amount of swap space in bytes.Returns the total amount of swap space in bytes. |
| getCommittedVirtualMemorySize | back to summary |
|---|---|
| public long getCommittedVirtualMemorySize() Returns the amount of virtual memory that is guaranteed to
be available to the running process in bytes,
or
| |
| getCpuLoad | back to summary |
|---|---|
| public 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.
The recent period of observation is implementation-specific, and
typically relates to the duration since the last call made to this
method, or API Note Callers should be aware of the possibility of other callers affecting the observation period and the result.
| |
| getFreeMemorySize | back to summary |
|---|---|
| public long getFreeMemorySize() Returns the amount of free memory in bytes.
| |
| getFreePhysicalMemorySize | back to summary |
|---|---|
| public default long getFreePhysicalMemorySize()
Returns the amount of free physical memory in bytes. Implementation Specification This implementation must return the same value
as
| |
| getFreeSwapSpaceSize | back to summary |
|---|---|
| public long getFreeSwapSpaceSize() Returns the amount of free swap space in bytes.
| |
| getProcessCpuLoad | back to summary |
|---|---|
| public 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. The recent period of observation is implementation-specific, and typically relates to the duration since the last call made to this method. For the very first invocation, the recent period of observation is undefined. All values between 0.0 and 1.0 are possible dependent on 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. API Note Callers should be aware of the possibility of other callers affecting the observation period and the result.
| |
| getProcessCpuTime | back to summary |
|---|---|
| public 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
| |
| getSystemCpuLoad | back to summary |
|---|---|
| public default double getSystemCpuLoad()
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.
The recent period of observation is implementation-specific, and
typically relates to the duration since the last call made to this
method, or API Note Callers should be aware of the possibility of other callers affecting the observation period and the result. Implementation Specification This implementation must return the same value
as
| |
| getTotalMemorySize | back to summary |
|---|---|
| public long getTotalMemorySize() Returns the total amount of memory in bytes.
| |
| getTotalPhysicalMemorySize | back to summary |
|---|---|
| public default long getTotalPhysicalMemorySize()
Returns the total amount of physical memory in bytes. Implementation Specification This implementation must return the same value
as
| |
| getTotalSwapSpaceSize | back to summary |
|---|---|
| public long getTotalSwapSpaceSize() Returns the total amount of swap space in bytes.
| |
