Interface UnixOperatingSystemMXBean

All Superinterfaces:: OperatingSystemMXBean, OperatingSystemMXBean, PlatformManagedObject

public interface UnixOperatingSystemMXBean extends OperatingSystemMXBean

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

Since:: 1.5

Method Summary

Modifier and Type	Method	Description
`long`	`getMaxFileDescriptorCount()`	Returns the maximum number of file descriptors.
`long`	`getOpenFileDescriptorCount()`	Returns the number of open file descriptors.

Methods declared in interface OperatingSystemMXBean

getCommittedVirtualMemorySize, getCpuLoad, getFreeMemorySize, getFreePhysicalMemorySize, getFreeSwapSpaceSize, getProcessCpuLoad, getProcessCpuTime, getSystemCpuLoad, getTotalMemorySize, getTotalPhysicalMemorySize, getTotalSwapSpaceSize

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 `OperatingSystemMXBean.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 `OperatingSystemMXBean.getCpuLoad()` instead of this historically named method.
`long`	`getTotalMemorySize()`	Returns the total amount of memory in bytes.
`default long`	`getTotalPhysicalMemorySize()`	Deprecated. Use `OperatingSystemMXBean.getTotalMemorySize()` instead of this historically named method.
`long`	`getTotalSwapSpaceSize()`	Returns the total amount of swap space in bytes.

Methods declared in interface OperatingSystemMXBean

getArch, getAvailableProcessors, getName, getSystemLoadAverage, getVersion

Modifier and Type	Method	Description
`String`	`getArch()`	Returns the operating system architecture.
`int`	`getAvailableProcessors()`	Returns the number of processors available to the Java virtual machine.
`String`	`getName()`	Returns the operating system name.
`double`	`getSystemLoadAverage()`	Returns the system load average for the last minute.
`String`	`getVersion()`	Returns the operating system version.

Methods declared in interface PlatformManagedObject

getObjectName

Modifier and Type	Method	Description
`ObjectName`	`getObjectName()`	Returns an `ObjectName` instance representing the object name of this platform managed object.

Method Details

getOpenFileDescriptorCount

long getOpenFileDescriptorCount()

Returns the number of open file descriptors.

Returns:: the number of open file descriptors.

getMaxFileDescriptorCount

long getMaxFileDescriptorCount()

Returns the maximum number of file descriptors.

Returns:: the maximum number of file descriptors.

© 1993, 2025, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.