Hi All,
it looks like the latest jt9 using OpenMP and multi-threaded FFTs along
with Joe's recent re-factorings for performance seem to be approaching
stability. If anyone wants to try them out on air with WSJT-X, the
attached patch will allow WSJT-X to be built with them enabled.
Note that the patch enables a fairly lengthy FFT plan optimization and
the first decode cycle may take a few minutes to complete, do not kill
the program as the accumulated FFT wisdom is written out at the end of a
session. Once the FFTW wisdom is saved there will be no further delays.
Testing here results in decodes that are so fast that it hardly seems
worth looking fro any more performance improvements until we start
getting 100's concurrent of QSOs per band. Impressive stuff!
Running on a quad-core Core i7 laptop here.
73
Bill
G4WJS.
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 26658bd..5c26815 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -345,7 +345,7 @@ MainWindow::MainWindow(bool multiple, QSettings * settings,
QSharedMemory *shdme
{
while(true)
{
- int iret=killbyname("jt9.exe");
+ int iret=killbyname("jt9_omp.exe");
if(iret == 603) break;
if(iret != 0) msgBox("KillByName return code: " +
QString::number(iret));
@@ -375,14 +375,14 @@ MainWindow::MainWindow(bool multiple, QSettings *
settings, QSharedMemory *shdme
QStringList jt9_args {
"-s", QApplication::applicationName ()
- , "-w", "1" //FFTW patience
- , "-m", "1" //FFTW threads
+ , "-w", "2" //FFTW patience
+ , "-m", QString::number (qMax (QThread::idealThreadCount () - 2, 1))
//FFTW threads
, "-e", QDir::toNativeSeparators (m_appDir)
, "-a", QDir::toNativeSeparators (m_dataDir.absolutePath ())
, "-t", QDir::toNativeSeparators (m_config.temp_dir ().absolutePath ())
};
proc_jt9.start(QDir::toNativeSeparators (m_appDir) + QDir::separator () +
- "jt9", jt9_args, QIODevice::ReadWrite | QIODevice::Unbuffered);
+ "jt9_omp", jt9_args, QIODevice::ReadWrite | QIODevice::Unbuffered);
QString fname {QDir::toNativeSeparators(m_dataDir.absoluteFilePath
("wsjtx_wisdom.dat"))};
QByteArray cfname=fname.toLocal8Bit();
@@ -1321,7 +1321,7 @@ void MainWindow::decode()
//decode()
void MainWindow::jt9_error (QProcess::ProcessError e)
{
if(!m_killAll) {
- msgBox("Error starting or running\n" + m_appDir + "/jt9 -s");
+ msgBox("Error starting or running\n" + m_appDir + "/jt9_omp -s");
qDebug() << e; // silence compiler warning
exit(1);
}
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