Muldersoft/LameXP
Muldersoft/LameXP
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Yet another new formula to selected the number of instances based on CPU count. This time a few desired 'sample points' have been defined and a 'cubic spline' through these sample points has been approximated. This solution should be more mathematically correct.

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This commit is contained in:
LoRd_MuldeR 2011-11-26 15:30:24 +01:00
parent 284e796e72
commit d81f65e7e7
2 changed files with 51 additions and 9 deletions
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2
src/Config.h
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@ -30,7 +30,7 @@
#define VER_LAMEXP_MINOR_LO 4
#define VER_LAMEXP_TYPE Alpha
#define VER_LAMEXP_PATCH 3
#define VER_LAMEXP_BUILD 789
#define VER_LAMEXP_BUILD 790
///////////////////////////////////////////////////////////////////////////////
// Tool versions (minimum expected versions!)

58
src/Dialog_Processing.cpp
View File

@ -70,11 +70,8 @@
//Maximum number of parallel instances
#define MAX_INSTANCES 16U
//Helper function
static inline double log5(double X)
{
return log(X) / log(5.0);
}
//Function to calculate the number of instances
static int cores2instances(int cores);
////////////////////////////////////////////////////////////
@ -368,8 +365,7 @@ void ProcessingDialog::initEncoding(void)
if(maximumInstances < 1)
{
lamexp_cpu_t cpuFeatures = lamexp_detect_cpu_features();
double cpu_count = static_cast<double>(qBound(1, cpuFeatures.count, 64));
maximumInstances = qRound(cpu_count / qMax(log5(cpu_count), 1.0));
maximumInstances = cores2instances(qBound(1, cpuFeatures.count, 64));
}
maximumInstances = qBound(1U, maximumInstances, static_cast<unsigned int>(m_pendingJobs.count()));
@ -982,4 +978,50 @@ bool ProcessingDialog::shutdownComputer(void)
progressDialog.close();
return true;
}
}
////////////////////////////////////////////////////////////
// HELPER FUNCTIONS
////////////////////////////////////////////////////////////
static int cores2instances(int cores)
{
//This function was approximated as a "cubic spline" with sampling points at:
//(1,1);(2,2);(4,4);(8,6);(16,8);(32,10);(64,12)
double x = static_cast<double>(cores), y = 1.0;
if(x >= 1.0)
{
if(x < 2.0)
{
y = ((83.0/5760.0) * pow(x,3.0)) - ((83.0/1920.0) * pow(x,2.0)) + ((2963.0/2880.0) * x);
}
else if((x >= 2.0) && (x < 4.0))
{
y = - ((83.0/2880.0) * pow(x,3.0)) + ((83.0/384.0) * pow(x,2.0)) + ((1469.0/2880.0) * x) + (83.0/240.0);
}
else if((x >= 4.0) && (x < 8.0))
{
y = ((469.0/46080.0) * pow(x,3.0)) - ((967.0/3840.0) * pow(x,2.0)) + ((343.0/144.0) * x) - (43.0/20.0);
}
else if((x >= 8.0) && (x < 16.0))
{
y = ((1.0/18432.0) * pow(x,3.0)) - ((17.0/1920.0) * pow(x,2.0)) + ((631.0/1440.0) * x) + (91.0/30.0);
}
else if((x >= 16.0) && (x < 32.0))
{
y = ((41.0/368640.0) * pow(x,3.0)) - ((89.0/7680.0) * pow(x,2.0)) + ((347.0/720.0) * x) + (14.0/5.0);
}
else if((x >= 32.0) && (x < 64.0))
{
y = ((7.0/737280.0) * pow(x,3.0)) - ((7.0/3840.0) * pow(x,2.0)) + ((61.0/360.0) * x) + (92.0/15.0);
}
else //if(x >= 64.0)
{
y = 12.0;
}
}
return qRound(y);
}