org.apache.hadoop.util

Class SysInfo

java.lang.Object

org.apache.hadoop.util.SysInfo

@InterfaceAudience.Public
@InterfaceStability.Evolving
public abstract class SysInfo
extends Object

Plugin to calculate resource information on the system.

Constructor Summary

Constructors

Constructor and Description
SysInfo()

Method Summary

Methods

Modifier and Type	Method and Description
abstract long	getAvailablePhysicalMemorySize() Obtain the total size of the available physical memory present in the system.
abstract long	getAvailableVirtualMemorySize() Obtain the total size of the available virtual memory present in the system.
abstract long	getCpuFrequency() Obtain the CPU frequency of on the system.
abstract float	getCpuUsage() Obtain the CPU usage % of the machine.
abstract long	getCumulativeCpuTime() Obtain the cumulative CPU time since the system is on.
abstract long	getNetworkBytesRead() Obtain the aggregated number of bytes read over the network.
abstract long	getNetworkBytesWritten() Obtain the aggregated number of bytes written to the network.
abstract int	getNumCores() Obtain total number of physical cores present on the system.
abstract int	getNumProcessors() Obtain the total number of logical processors present on the system.
abstract long	getPhysicalMemorySize() Obtain the total size of the physical memory present in the system.
abstract long	getStorageBytesRead() Obtain the aggregated number of bytes read from disks.
abstract long	getStorageBytesWritten() Obtain the aggregated number of bytes written to disks.
abstract long	getVirtualMemorySize() Obtain the total size of the virtual memory present in the system.
static SysInfo	newInstance() Return default OS instance.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SysInfo

public SysInfo()

Method Detail

newInstance

public static SysInfo newInstance()

Return default OS instance.

Returns:

Default instance for the detected OS.

Throws:

UnsupportedOperationException - If cannot determine OS.

getVirtualMemorySize

public abstract long getVirtualMemorySize()

Obtain the total size of the virtual memory present in the system.

Returns:

virtual memory size in bytes.

getPhysicalMemorySize

public abstract long getPhysicalMemorySize()

Obtain the total size of the physical memory present in the system.

Returns:

physical memory size bytes.

getAvailableVirtualMemorySize

public abstract long getAvailableVirtualMemorySize()

Obtain the total size of the available virtual memory present in the system.

Returns:

available virtual memory size in bytes.

getAvailablePhysicalMemorySize

public abstract long getAvailablePhysicalMemorySize()

Obtain the total size of the available physical memory present in the system.

Returns:

available physical memory size bytes.

getNumProcessors

public abstract int getNumProcessors()

Obtain the total number of logical processors present on the system.

Returns:

number of logical processors

getNumCores

public abstract int getNumCores()

Obtain total number of physical cores present on the system.

Returns:

number of physical cores

getCpuFrequency

public abstract long getCpuFrequency()

Obtain the CPU frequency of on the system.

Returns:

CPU frequency in kHz

getCumulativeCpuTime

public abstract long getCumulativeCpuTime()

Obtain the cumulative CPU time since the system is on.

Returns:

cumulative CPU time in milliseconds

getCpuUsage

public abstract float getCpuUsage()

Obtain the CPU usage % of the machine. Return -1 if it is unavailable

Returns:

CPU usage as a percentage of available cycles.

getNetworkBytesRead

public abstract long getNetworkBytesRead()

Obtain the aggregated number of bytes read over the network.

Returns:

total number of bytes read.

getNetworkBytesWritten

public abstract long getNetworkBytesWritten()

Obtain the aggregated number of bytes written to the network.

Returns:

total number of bytes written.

getStorageBytesRead

public abstract long getStorageBytesRead()

Obtain the aggregated number of bytes read from disks.

Returns:

total number of bytes read.

getStorageBytesWritten

public abstract long getStorageBytesWritten()

Obtain the aggregated number of bytes written to disks.

Returns:

total number of bytes written.