org.apache.hadoop.util
Class LinuxResourceCalculatorPlugin

java.lang.Object
  org.apache.hadoop.conf.Configured
      org.apache.hadoop.util.ResourceCalculatorPlugin
          org.apache.hadoop.util.LinuxResourceCalculatorPlugin

All Implemented Interfaces:

Configurable

public class LinuxResourceCalculatorPlugin
extends ResourceCalculatorPlugin

Plugin to calculate resource information on Linux systems.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.util.ResourceCalculatorPlugin

ResourceCalculatorPlugin.ProcResourceValues

Constructor Summary

LinuxResourceCalculatorPlugin()

LinuxResourceCalculatorPlugin(String procfsMemFile, String procfsCpuFile, String procfsStatFile, long jiffyLengthInMillis)
Constructor which allows assigning the /proc/ directories.

Method Summary

long	getAvailablePhysicalMemorySize() Obtain the total size of the available physical memory present in the system.
long	getAvailableVirtualMemorySize() Obtain the total size of the available virtual memory present in the system.
long	getCpuFrequency() Obtain the CPU frequency of on the system.
float	getCpuUsage() Obtain the CPU usage % of the machine.
long	getCumulativeCpuTime() Obtain the cumulative CPU time since the system is on.
int	getNumProcessors() Obtain the total number of processors present on the system.
long	getPhysicalMemorySize() Obtain the total size of the physical memory present in the system.
ResourceCalculatorPlugin.ProcResourceValues	getProcResourceValues() Obtain resource status used by current process tree.
long	getVirtualMemorySize() Obtain the total size of the virtual memory present in the system.
static void	main(String[] args) Test the LinuxResourceCalculatorPlugin

Methods inherited from class org.apache.hadoop.util.ResourceCalculatorPlugin

getResourceCalculatorPlugin

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

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

Constructor Detail

LinuxResourceCalculatorPlugin

public LinuxResourceCalculatorPlugin()

LinuxResourceCalculatorPlugin

public LinuxResourceCalculatorPlugin(String procfsMemFile,
                                     String procfsCpuFile,
                                     String procfsStatFile,
                                     long jiffyLengthInMillis)

Constructor which allows assigning the /proc/ directories. This will be used only in unit tests

Parameters:

procfsMemFile - fake file for /proc/meminfo

procfsCpuFile - fake file for /proc/cpuinfo

procfsStatFile - fake file for /proc/stat

jiffyLengthInMillis - fake jiffy length value

Method Detail

getPhysicalMemorySize

public long getPhysicalMemorySize()

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

Specified by:

getPhysicalMemorySize in class ResourceCalculatorPlugin

Returns:

physical memory size bytes.

getVirtualMemorySize

public long getVirtualMemorySize()

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

Specified by:

getVirtualMemorySize in class ResourceCalculatorPlugin

Returns:

virtual memory size in bytes.

getAvailablePhysicalMemorySize

public long getAvailablePhysicalMemorySize()

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

Specified by:

getAvailablePhysicalMemorySize in class ResourceCalculatorPlugin

Returns:

available physical memory size bytes.

getAvailableVirtualMemorySize

public long getAvailableVirtualMemorySize()

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

Specified by:

getAvailableVirtualMemorySize in class ResourceCalculatorPlugin

Returns:

available virtual memory size in bytes.

getNumProcessors

public int getNumProcessors()

Obtain the total number of processors present on the system.

Specified by:

getNumProcessors in class ResourceCalculatorPlugin

Returns:

number of processors

getCpuFrequency

public long getCpuFrequency()

Obtain the CPU frequency of on the system.

Specified by:

getCpuFrequency in class ResourceCalculatorPlugin

Returns:

CPU frequency in kHz

getCumulativeCpuTime

public long getCumulativeCpuTime()

Obtain the cumulative CPU time since the system is on.

Specified by:

getCumulativeCpuTime in class ResourceCalculatorPlugin

Returns:

cumulative CPU time in milliseconds

getCpuUsage

public float getCpuUsage()

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

Specified by:

getCpuUsage in class ResourceCalculatorPlugin

Returns:

CPU usage in %

main

public static void main(String[] args)

Test the LinuxResourceCalculatorPlugin

Parameters:

args -

getProcResourceValues

public ResourceCalculatorPlugin.ProcResourceValues getProcResourceValues()

Description copied from class: ResourceCalculatorPlugin

Obtain resource status used by current process tree.

Specified by:

getProcResourceValues in class ResourceCalculatorPlugin