flightsimulatorplatfrom/pilotclient
1
0
Fork 0
mirror of https://github.com/swift-project/pilotclient.git synced 2026-03-23 07:15:35 +08:00
Code Issues Packages Projects Releases Wiki Activity

refs #710 Sample to compare performance of string utilities versus regular expressions.

Browse Source
This commit is contained in:
Mathew Sutcliffe
2016-09-01 21:06:18 +01:00
parent 87eeac4e15
commit 80dc4ea49a
3 changed files with 88 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

83
samples/blackmisc/samplesperformance.cpp
View File

@@ -19,6 +19,7 @@
#include "blackmisc/aviation/callsign.h"
#include "blackmisc/geo/coordinategeodetic.h"
#include "blackmisc/pq/units.h"
#include "blackmisc/stringutils.h"
#include "blackmisc/testing.h"
#include <QDateTime>
@@ -36,6 +37,7 @@
#include <algorithm>
#include <iterator>
using namespace BlackMisc;
using namespace BlackMisc::Aviation;
using namespace BlackMisc::Geo;
using namespace BlackMisc::PhysicalQuantities;
@@ -340,6 +342,87 @@ namespace BlackSample
return 0;
}
int CSamplesPerformance::samplesString(QTextStream &out)
{
QTime timer;
static const QString chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789~_-=+!\"@#$%^&*()[]{} \t;:\\/?,.<>";
QStringList strings;
std::generate_n(std::back_inserter(strings), 100000, []
{
QString s;
std::generate_n(std::back_inserter(s), 10, [] { return chars[qrand() % chars.size()]; });
return s;
});
QString bigString = strings.join("\n");
QRegularExpression upperRegex("[A-Z]");
upperRegex.optimize();
timer.start();
for (const QString &s : strings)
{
auto c = containsChar(s, [](QChar c) { return c.isUpper(); });
Q_UNUSED(c);
}
out << "Check 100,000 strings for containing uppercase letter: (utility) " << timer.elapsed() << "ms" << endl;
timer.start();
for (const QString &s : strings)
{
auto c = s.contains(upperRegex);
Q_UNUSED(c);
}
out << "Check 100,000 strings for containing uppercase letter: (regex) " << timer.elapsed() << "ms" << endl << endl;
timer.start();
for (const QString &s : strings)
{
auto i = indexOfChar(s, [](QChar c) { return c.isUpper(); });
Q_UNUSED(i);
}
out << "Check 100,000 strings for index of first uppercase letter: (utility) " << timer.elapsed() << "ms" << endl;
timer.start();
for (const QString &s : strings)
{
auto i = s.indexOf(upperRegex);
Q_UNUSED(i);
}
out << "Check 100,000 strings for index of first uppercase letter: (regex) " << timer.elapsed() << "ms" << endl << endl;
auto temp = strings;
timer.start();
for (QString &s : strings)
{
removeChars(s, [](QChar c) { return c.isUpper(); });
}
out << "Remove from 100,000 strings all uppercase letters: (utility) " << timer.elapsed() << "ms" << endl;
strings = temp;
timer.start();
for (QString &s : strings)
{
s.remove(upperRegex);
}
out << "Remove from 100,000 strings all uppercase letters: (regex) " << timer.elapsed() << "ms" << endl << endl;
timer.start();
{
auto lines = splitLines(bigString);
Q_UNUSED(lines);
}
out << "Split 100,000 line string into list of lines: (QStringList) " << timer.elapsed() << "ms" << endl;
timer.start();
{
auto lines = splitLinesRefs(bigString);
Q_UNUSED(lines);
}
out << "Split 100,000 line string into list of lines: (QList<QStringRef>) " << timer.elapsed() << "ms" << endl;
return 0;
}
CAircraftSituationList CSamplesPerformance::createSituations(qint64 baseTimeEpoch, int numberOfCallsigns, int numberOfTimes)
{
CAircraftSituationList situations;