water.util

Class LinuxProcFileReader

java.lang.Object

water.util.LinuxProcFileReader

public abstract class LinuxProcFileReader
extends java.lang.Object

Linux /proc file reader. Read tick information for the system and the current process in order to provide stats on the cloud page about CPU utilization. Tick counts are monotonically increasing since boot. Find definitions of /proc file info here. http://man7.org/linux/man-pages/man5/proc.5.html

Constructor Summary

Constructors

Constructor and Description
LinuxProcFileReader()

Method Summary

Methods

Modifier and Type	Method and Description
static long[][]	getCpuTicks() Array of ticks: [cpu number][tick type] tick types are: [0] user ticks [1] system ticks [2] other ticks (i/o) [3] idle ticks
static char	getProcessCpusAllowed()
static int	getProcessID()
static int	getProcessNumOpenFds()
static long	getProcessRss()
static long	getProcessTotalTicks()
static long	getSystemIdleTicks()
static long	getSystemTotalTicks()
static void	main(java.lang.String[] args) Main is purely for command-line testing.
static boolean	refresh() Read and parse data from /proc/stat and /proc/pid/stat.

Methods inherited from class java.lang.Object

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

Constructor Detail

LinuxProcFileReader

public LinuxProcFileReader()

Method Detail

getProcessID

public static int getProcessID()

Returns:

process id for this node

getProcessCpusAllowed

public static char getProcessCpusAllowed()

Returns:

number of CPUs allowed by this process.

getProcessTotalTicks

public static long getProcessTotalTicks()

Returns:

ticks this process was running.

getProcessRss

public static long getProcessRss()

Returns:

resident set size (RSS) of this process.

getCpuTicks

public static long[][] getCpuTicks()

Array of ticks: [cpu number][tick type] tick types are: [0] user ticks [1] system ticks [2] other ticks (i/o) [3] idle ticks

Returns:

ticks array for each cpu of the system.

getSystemIdleTicks

public static long getSystemIdleTicks()

Returns:

ticks the system was idle. in general: idle + busy == 100%

getSystemTotalTicks

public static long getSystemTotalTicks()

Returns:

ticks the system was up.

getProcessNumOpenFds

public static int getProcessNumOpenFds()

Returns:

number of currently open fds of this process.

refresh

public static boolean refresh()

Read and parse data from /proc/stat and /proc/pid/stat. If this doesn't work for some reason, the values will be -1.

main

public static void main(java.lang.String[] args)

Main is purely for command-line testing.