CpuUsage Class Reference

#include <CpuUsage.hpp>

Collaboration diagram for CpuUsage:

[legend]List of all members.

Public Member Functions
float	utilization ()
Static Public Member Functions
CpuUsage &	getInstance ()
Private Member Functions
void	cpuLoop ()
	CpuUsage ()
Static Private Member Functions
void *	cpuLoopWrapper (void *ptr)
Private Attributes
unsigned long	us
unsigned long	usLow
unsigned long	sy
unsigned long	id
unsigned long	currTotal
unsigned long	currUsed
unsigned long	prevTotal
unsigned long	prevUsed
double	util
double	utilInInterval
int	numLoops
pthread_t	thread
pthread_mutex_t	mutex
Static Private Attributes
const int	CPU_MEASURE_INTERVAL = 10
CpuUsage *	singleInstance = 0

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Detailed Description

CpuUsage - Utility class to measure Cpu Usage.

This class was designed to constantly measure CPU utilization on Linux systems. Basically, it starts a thread that periodically gathers information from the OS (via /proc), and reports the last average CPU utilization when queried.

CpuUsage is a singleton, since ther is no reason to have more than one CPU measurer in our system.

Author:

Andrei Goldchleger

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Constructor & Destructor Documentation

CpuUsage::CpuUsage (   )  [private]

Constructor.

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Member Function Documentation

void CpuUsage::cpuLoop (   )  [private]

CPU Measurement function (an infinite loop).

void * CpuUsage::cpuLoopWrapper (  void *  ptr  )  [static, private]

cpuLoop wrapper. Needed because pthreads require a function pointer

CpuUsage & CpuUsage::getInstance (   )  [static]

Returns a reference to CpuUsage's singleton.

float CpuUsage::utilization (   )

Returns average CPU utilization. Returns a float in the range [0..100] representing the average CPU utilization since last call.

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Member Data Documentation

const int CpuUsage::CPU_MEASURE_INTERVAL = 10 [static, private]

time between CPU usage measurements

unsigned long CpuUsage::currTotal [private]

unsigned long CpuUsage::currUsed [private]

unsigned long CpuUsage::id [private]

pthread_mutex_t CpuUsage::mutex [private]

protects CPU utilization from race conditions

int CpuUsage::numLoops [private]

unsigned long CpuUsage::prevTotal [private]

unsigned long CpuUsage::prevUsed [private]

CpuUsage * CpuUsage::singleInstance = 0 [static, private]

CpuUsage singleton

unsigned long CpuUsage::sy [private]

pthread_t CpuUsage::thread [private]

thread that keeps collecting CPU availability

unsigned long CpuUsage::us [private]

unsigned long CpuUsage::usLow [private]

double CpuUsage::util [private]

CPU utilization in current interval

double CpuUsage::utilInInterval [private]

diference bettween current and last measurement

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The documentation for this class was generated from the following files:

• CpuUsage.hpp
• CpuUsage.cpp

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