Muldersoft/LameXP
Muldersoft/LameXP
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Added function to calculate the number threads from the number of cores. This function is a cubic spline that resembles the current benchmarking results.

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This commit is contained in:
LoRd_MuldeR 2013-11-02 16:39:59 +01:00
parent a3fdbee680
commit 7b2ca53f3f
2 changed files with 31 additions and 3 deletions
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2
src/Config.h
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@ -35,7 +35,7 @@
#define VER_LAMEXP_MINOR_LO 9
#define VER_LAMEXP_TYPE Alpha
#define VER_LAMEXP_PATCH 7
#define VER_LAMEXP_BUILD 1449
#define VER_LAMEXP_BUILD 1450
#define VER_LAMEXP_CONFG 1348
///////////////////////////////////////////////////////////////////////////////

30
src/Thread_Initialization.cpp
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@ -50,6 +50,33 @@ static const size_t EXPECTED_TOOL_COUNT = 27;
/* benchmark */
#undef ENABLE_BENCHMARK
/* number of CPU cores -> number of threads */
static unsigned int cores2threads(const unsigned int cores)
{
static const size_t LUT_LEN = 4;
static const struct
{
const unsigned int upperBound;
const double coeffs[4];
}
LUT[LUT_LEN] =
{
{ 4, { -0.052695810565, 0.158087431694, 4.982841530055, -1.088233151184 } },
{ 8, { 0.042431693989, -0.983442622951, 9.548961748634, -7.176393442623 } },
{ 12, { -0.006277322404, 0.185573770492, 0.196830601093, 17.762622950820 } },
{ 32, { 0.000673497268, -0.064655737705, 3.199584699454, 5.751606557377 } }
};
size_t index = 0;
while((cores > LUT[index].upperBound) && (index < (LUT_LEN-1))) index++;
const double x = qBound(1.0, double(cores), double(LUT[LUT_LEN-1].upperBound));
const double y = (LUT[index].coeffs[0] * pow(x, 3.0)) + (LUT[index].coeffs[1] * pow(x, 2.0)) + (LUT[index].coeffs[2] * x) + LUT[index].coeffs[3];
return qRound(abs(y));
}
////////////////////////////////////////////////////////////
// ExtractorTask class
////////////////////////////////////////////////////////////
@ -286,7 +313,8 @@ double InitializationThread::doInit(const size_t threadCount)
QDir appDir = QDir(QCoreApplication::applicationDirPath()).canonicalPath();
QThreadPool *pool = new QThreadPool();
pool->setMaxThreadCount((threadCount > 0) ? threadCount : qBound(2U, (m_cpuFeatures.count * 3U), EXPECTED_TOOL_COUNT));
pool->setMaxThreadCount((threadCount > 0) ? threadCount : qBound(2U, cores2threads(m_cpuFeatures.count), EXPECTED_TOOL_COUNT));
//qWarning("Using %u threads for extraction.", pool->maxThreadCount());
LockedFile::selfTest();
ExtractorTask::clearFlags();