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Use getrusage() instead of gettimeofday() for CPU Load calculation.

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This commit is contained in:
philburk 2002-04-12 18:07:20 +00:00
commit 365a8e2444
1 changed files with 10 additions and 7 deletions
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17
pa_mac_core/pa_mac_core.c
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@ -50,6 +50,7 @@
Check for getenv("PA_MIN_LATEWNCY_MSEC") to set latency externally.
Better error checking for invalid channel counts and invalid devices.
3.29.2002 - Phil Burk - Fixed Pa_GetCPULoad() for small buffers.
3.31.2002 - Phil Burk - Use getrusage() instead of gettimeofday() for CPU Load calculation.
TODO:
O- how do mono output?
@ -59,6 +60,7 @@ O- FIFO between input and output callbacks if different devices, like in pa_mac.
#include <CoreServices/CoreServices.h>
#include <CoreAudio/CoreAudio.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
#include "portaudio.h"
@ -98,7 +100,7 @@ typedef struct PaHostSoundControl
int pahsc_FramesPerHostBuffer;
int pahsc_UserBuffersPerHostBuffer;
/* For measuring CPU utilization. */
struct timeval pahsc_EntryTime;
struct rusage pahsc_EntryRusage;
double pahsc_InverseMicrosPerHostBuffer; /* 1/Microseconds of real-time audio per user buffer. */
}
PaHostSoundControl;
@ -156,8 +158,8 @@ static void Pa_StartUsageCalculation( internalPortAudioStream *past )
{
PaHostSoundControl *pahsc = (PaHostSoundControl *) past->past_DeviceData;
if( pahsc == NULL ) return;
/* Query system timer for usage analysis and to prevent overuse of CPU. */
gettimeofday( &pahsc->pahsc_EntryTime, NULL );
/* Query user CPU timer for usage analysis and to prevent overuse of CPU. */
getrusage( RUSAGE_SELF, &pahsc->pahsc_EntryRusage );
}
static long SubtractTime_AminusB( struct timeval *timeA, struct timeval *timeB )
@ -174,7 +176,7 @@ static long SubtractTime_AminusB( struct timeval *timeA, struct timeval *timeB )
*/
static void Pa_EndUsageCalculation( internalPortAudioStream *past )
{
struct timeval currentTime;
struct rusage currentRusage;
long usecsElapsed;
double newUsage;
@ -183,10 +185,11 @@ static void Pa_EndUsageCalculation( internalPortAudioStream *past )
PaHostSoundControl *pahsc = (PaHostSoundControl *) past->past_DeviceData;
if( pahsc == NULL ) return;
if( gettimeofday( &currentTime, NULL ) == 0 )
if( getrusage( RUSAGE_SELF, &currentRusage ) == 0 )
{
usecsElapsed = SubtractTime_AminusB( &currentTime, &pahsc->pahsc_EntryTime );
usecsElapsed = SubtractTime_AminusB( &currentRusage.ru_utime, &pahsc->pahsc_EntryRusage.ru_utime );
/* Use inverse because it is faster than the divide. */
newUsage = usecsElapsed * pahsc->pahsc_InverseMicrosPerHostBuffer;