Simple script to test rendering speed + make a profile

qgisspeedtest.cpp

#include <QApplication>
#include <QTime>

#include <gperftools/profiler.h>

#include <qgsapplication.h>
#include <qgsgeometry.h>
#include <qgsmaplayerregistry.h>
#include <qgsmaprenderersequentialjob.h>
#include <qgsmapsettings.h>
#include <qgsvectorlayer.h>
#include <qgsvectordataprovider.h>
#include <qgsvectorfilewriter.h>

int main(int argc, char *argv[])
{
  QApplication a(argc, argv);

  QgsApplication::init();
  QgsApplication::initQgis();

  //QgsVectorLayer* vl = new QgsVectorLayer("Linestring", "x", "memory");

  QgsVectorLayer* vl = new QgsVectorLayer("Polygon", "x", "memory");

  //QgsVectorLayer* vl = new QgsVectorLayer("Point", "x", "memory");

  Q_ASSERT( vl->isValid() );

  QgsFeatureList fl;
  for (int i = 0; i < 1000000; ++i)
  {
    QgsFeature f;
    QgsPolyline pl;
    QgsPoint pBase( i % 1000, i / 1000 );
    pl << pBase << pBase + QgsVector(10,0) << pBase + QgsVector(10,10) << pBase + QgsVector(0,10);
    QgsPolygon pg;
    pg << pl;
    f.setGeometry(QgsGeometry::fromPolygon(pg));
    //f.setGeometry(QgsGeometry::fromPolyline(pl));
    //f.setGeometry( QgsGeometry::fromPoint( QgsPoint( i % 1000, i / 1000 ) ) );
    fl << f;
  }
  vl->dataProvider()->addFeatures(fl);

  /*
  const QgsCoordinateReferenceSystem *destCRS = 0;
  QString shpName = "/tmp/vvv.shp";
  QgsVectorFileWriter::deleteShapeFile(shpName);
  QgsVectorFileWriter::writeAsVectorFormat(vl, shpName, "UTF-8", destCRS);

  QgsVectorLayer* vl2 = new QgsVectorLayer(shpName, "aaa", "ogr");
  Q_ASSERT(vl2->isValid());*/

  QgsMapLayerRegistry::instance()->addMapLayer(vl);
  //QgsMapLayerRegistry::instance()->addMapLayer(vl2);

  QgsMapSettings ms;
  ms.setLayers(QStringList() << vl->id());
  ms.setExtent(vl->extent());
  ms.setOutputSize(QSize(512,512));

  QgsMapRendererSequentialJob job(ms);

  QTime t;

  ProfilerStart("/tmp/profile");

  int total = 0;
  int cnt = 2;
  for (int i = 0; i < cnt; i++)
  {
    t.start();

    job.start();
    job.waitForFinished();

    int tt = t.elapsed();
    total += tt;

    qDebug("ttttt %d ms", tt);
  }

  ProfilerStop();

  qDebug("AVG %d", total / cnt);

  job.renderedImage().save("/tmp/profile.png");

  QgsApplication::exitQgis();

  return 0;
}