C++ data (Re: [PyKDE] PyQT module size)

[Simon Edwards]

Hello,

I wrote a version of mem.py in C++, and have put the data side by side in a 
spreadsheet. It appears that a PyQt program more overhead has in terms of 
libraries over C++, roughly 8Mb in this test for me. When running, the memory 
usage pattern seems to mirror the C++ program with perhaps a little bit of 
overhead per object, ~10% (ballpark figure).

What is needed now is some tests that create lots of Qt objects, and then see 
how object creation affects memory usage.

Using Mandrake Linux 10.1, Qt-3.3.3, SIP 4.0.1 (I think, from kdebindings 
3.3.1)

cheers,

-- 
Simon Edwards             | Guarddog Firewall
[EMAIL PROTECTED]       | http://www.simonzone.com/software/
Nijmegen, The Netherlands | "ZooTV? You made the right choice."

PyQt_memory_usage.xls
Description: application/msexcel

/*

*/
#include <qapplication.h>
#include <qstringlist.h>
#include <qpushbutton.h>
#include <qfile.h>

void ProcMem() {
	QStringList lines;
	QFile file("/proc/self/status");

	if(file.open( IO_ReadOnly ) ) {
		QTextStream stream( &file );
		QString line;
		while ( !stream.atEnd() ) {
			line = stream.readLine(); // line of text excluding '\n
			if(line.startsWith("V")) {
				printf( "%s\n", line.latin1() );
			}
			lines += line;
		}
	file.close();
	}
} 

int main( int argc, char ** argv ) {
	printf("\nInitial values\n");
	ProcMem();
    
	printf("\nCreate QApplication\n");
	QApplication *qapp = new QApplication( argc, argv );
	ProcMem();

	printf("\nCreate Pushbutton\n");
	QPushButton *b = new QPushButton("&Hello World", 0);
	qapp->setMainWidget(b);
	ProcMem();

	printf("\nShow Pushbutton\n");
	b->show();
	ProcMem();

	printf("\nConnect Pushbutton signal\n");
	qapp->connect(b, SIGNAL(clicked()), qapp, SLOT(quit()));
	ProcMem();

	printf("Enter Mainloop\n");
	qapp->exec();
	ProcMem();

	printf("Mainloop finished\n");
	ProcMem();

	printf("Delete Pushbutton\n");
	delete b;
	ProcMem();

	printf("Delete Application\n");
	delete qapp;
	ProcMem();
        
	return 0;
}

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