pa_cpuload.c File Reference

Functions to assist in measuring the CPU utilization of a callback stream. Used to implement the Pa_GetStreamCpuLoad() function. More...

#include "pa_cpuload.h"
#include <assert.h>
#include "pa_util.h"

Defines
#define	LOWPASS_COEFFICIENT_0   (0.9)
#define	LOWPASS_COEFFICIENT_1   (0.99999 - LOWPASS_COEFFICIENT_0)
Functions
void	PaUtil_InitializeCpuLoadMeasurer (PaUtilCpuLoadMeasurer *measurer, double sampleRate)
void	PaUtil_ResetCpuLoadMeasurer (PaUtilCpuLoadMeasurer *measurer)
void	PaUtil_BeginCpuLoadMeasurement (PaUtilCpuLoadMeasurer *measurer)
void	PaUtil_EndCpuLoadMeasurement (PaUtilCpuLoadMeasurer *measurer, unsigned long framesProcessed)
double	PaUtil_GetCpuLoad (PaUtilCpuLoadMeasurer *measurer)

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Detailed Description

Functions to assist in measuring the CPU utilization of a callback stream. Used to implement the Pa_GetStreamCpuLoad() function.

Todo:

Dynamically calculate the coefficients used to smooth the CPU Load Measurements over time to provide a uniform characterisation of CPU Load independent of rate at which PaUtil_BeginCpuLoadMeasurement / PaUtil_EndCpuLoadMeasurement are called.

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Define Documentation

#define LOWPASS_COEFFICIENT_0   (0.9)

#define LOWPASS_COEFFICIENT_1   (0.99999 - LOWPASS_COEFFICIENT_0)

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Function Documentation

void PaUtil_BeginCpuLoadMeasurement

(

PaUtilCpuLoadMeasurer *

measurer

)

void PaUtil_EndCpuLoadMeasurement	(	PaUtilCpuLoadMeasurer *	measurer,
		unsigned long	framesProcessed
	)

double PaUtil_GetCpuLoad

(

PaUtilCpuLoadMeasurer *

measurer

)

void PaUtil_InitializeCpuLoadMeasurer	(	PaUtilCpuLoadMeasurer *	measurer,
		double	sampleRate
	)

void PaUtil_ResetCpuLoadMeasurer

(

PaUtilCpuLoadMeasurer *

measurer

)

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