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Ref T280, sample to test if QHash or QMap for key callsign is faster

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* QHash seems to be faster and is const
* see also https://woboq.com/blog/qmap_qhash_benchmark.html
This commit is contained in:
Klaus Basan
2018-06-12 00:42:10 +02:00
parent 25a2a8d350
commit 398ca4fb45
3 changed files with 172 additions and 4 deletions
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150
samples/blackmisc/samplesperformance.cpp
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@@ -529,6 +529,110 @@ namespace BlackSample
return EXIT_SUCCESS;
}
int CSamplesPerformance::sampleQMapVsQHashByCallsign(QTextStream &out)
{
const CCallsignSet cs10 = CSamplesPerformance::callsigns(10);
const CCallsignSet cs25 = CSamplesPerformance::callsigns(25);
const CCallsignSet cs50 = CSamplesPerformance::callsigns(50);
const QMap<CCallsign, CAircraftSituation> m10 = CSamplesPerformance::situationsMap(cs10);
const QMap<CCallsign, CAircraftSituation> m25 = CSamplesPerformance::situationsMap(cs25);
const QMap<CCallsign, CAircraftSituation> m50 = CSamplesPerformance::situationsMap(cs50);
const QHash<CCallsign, CAircraftSituation> h10 = CSamplesPerformance::situationsHash(cs10);
const QHash<CCallsign, CAircraftSituation> h25 = CSamplesPerformance::situationsHash(cs25);
const QHash<CCallsign, CAircraftSituation> h50 = CSamplesPerformance::situationsHash(cs50);
Q_ASSERT(m10.size() == 10 && h10.size() == 10);
Q_ASSERT(m25.size() == 25 && h25.size() == 25);
Q_ASSERT(m50.size() == 50 && h50.size() == 50);
// QList since we have to add callsigns multiple times, set does not allow that
QList<CCallsign> cs_10_100_rnd;
QList<CCallsign> cs_25_100_rnd;
QList<CCallsign> cs_50_100_rnd;
for (int i = 0; i < 20; ++i)
{
cs_10_100_rnd.append(cs10.randomElements(5).toQList());
cs_25_100_rnd.append(cs25.randomElements(5).toQList());
cs_50_100_rnd.append(cs50.randomElements(5).toQList());
}
Q_ASSERT(cs_10_100_rnd.size() == 100);
Q_ASSERT(cs_25_100_rnd.size() == 100);
Q_ASSERT(cs_50_100_rnd.size() == 100);
QTime time;
time.start();
for (int i = 1; i < 10000; ++i)
{
for (const CCallsign &cs : cs_10_100_rnd)
{
CAircraftSituation s = m10[cs];
Q_ASSERT_X(s.getCallsign() == cs, Q_FUNC_INFO, "Wromg callsign");
}
}
out << "map 100 out of 10: " << time.elapsed() << "ms" << endl;
time.start();
for (int i = 1; i < 10000; ++i)
{
for (const CCallsign &cs : cs_10_100_rnd)
{
CAircraftSituation s = h10[cs];
Q_ASSERT_X(s.getCallsign() == cs, Q_FUNC_INFO, "Wromg callsign");
}
}
out << "hash 100 out of 10: " << time.elapsed() << "ms" << endl;
time.start();
for (int i = 1; i < 10000; ++i)
{
for (const CCallsign &cs : cs_25_100_rnd)
{
CAircraftSituation s = m25[cs];
Q_ASSERT_X(s.getCallsign() == cs, Q_FUNC_INFO, "Wromg callsign");
}
}
out << "map 100 out of 25: " << time.elapsed() << "ms" << endl;
time.start();
for (int i = 1; i < 10000; ++i)
{
for (const CCallsign &cs : cs_25_100_rnd)
{
CAircraftSituation s = h25[cs];
Q_ASSERT_X(s.getCallsign() == cs, Q_FUNC_INFO, "Wromg callsign");
}
}
out << "hash 100 out of 25: " << time.elapsed() << "ms" << endl;
time.start();
for (int i = 1; i < 10000; ++i)
{
for (const CCallsign &cs : cs_50_100_rnd)
{
CAircraftSituation s = m50[cs];
Q_ASSERT_X(s.getCallsign() == cs, Q_FUNC_INFO, "Wromg callsign");
}
}
out << "map 100 out of 50: " << time.elapsed() << "ms" << endl;
time.start();
for (int i = 1; i < 10000; ++i)
{
for (const CCallsign &cs : cs_50_100_rnd)
{
CAircraftSituation s = h50[cs];
Q_ASSERT_X(s.getCallsign() == cs, Q_FUNC_INFO, "Wromg callsign");
}
}
out << "hash 100 out of 50: " << time.elapsed() << "ms" << endl;
return EXIT_SUCCESS;
}
CAircraftSituationList CSamplesPerformance::createSituations(qint64 baseTimeEpoch, int numberOfCallsigns, int numberOfTimes)
{
CAircraftSituationList situations;
@@ -572,7 +676,7 @@ namespace BlackSample
void CSamplesPerformance::calculateDistance(int n)
{
if (n < 1) return;
if (n < 1) { return; }
CAtcStation atc = CTesting::createStation(1);
const QList<CCoordinateGeodetic> pos(
{
@@ -648,6 +752,50 @@ namespace BlackSample
return lc;
}
CCallsignSet CSamplesPerformance::callsigns(int number)
{
CCallsignSet set;
static const QString cs("FOO%1");
for (int i = 0; i < number; i++)
{
set.insert(CCallsign(cs.arg(i)));
}
return set;
}
const CAircraftSituationList CSamplesPerformance::situations(const CCallsignSet &callsigns)
{
CAircraftSituationList situations;
for (const CCallsign &cs : callsigns)
{
const CAircraftSituation s(cs);
situations.push_back(s);
}
return situations;
}
const QMap<CCallsign, CAircraftSituation> CSamplesPerformance::situationsMap(const CCallsignSet &callsigns)
{
QMap<CCallsign, CAircraftSituation> situations;
for (const CCallsign &cs : callsigns)
{
const CAircraftSituation s(cs);
situations.insert(cs, s);
}
return situations;
}
const QHash<CCallsign, CAircraftSituation> CSamplesPerformance::situationsHash(const CCallsignSet &callsigns)
{
QHash<CCallsign, CAircraftSituation> situations;
for (const CCallsign &cs : callsigns)
{
const CAircraftSituation s(cs);
situations.insert(cs, s);
}
return situations;
}
const CAtcStationList &CSamplesPerformance::stations10k()
{
static const CAtcStationList s = CTesting::createAtcStations(10000, false);