Memory usage with QtQuick 2.0

Qurx

Hi folks,

I'm writing a QtQuick 2.0 plugin which needs to allocate a "quite large" chunk of memory ( ~ 800Mo ). This allocation fails (bad_alloc, and it's not the ctors' which is throwing as I'm allocing an array of chars).

A reduced example would be :

@
class Bar : QQuickItem
{
Q_OBJECT

public:
Bar::Bar()
{

    char *foo = NULL;

    foo = (char*) malloc(800000000);
    if (foo)
    {
        *foo = 5;
        qDebug() <<  "Working";
    }
}

};
@

(Forget correctness, I just want it to be concise, and I use malloc just for the example, but it doesn't matter).

This won't print "Working" as the alloc fails and malloc returns NULL.

This is on Windows XP 32 bit.

With a Qt Executable such an allocation works (as expected), so I'm wondering if there is something in the QtQuick machinery which tends to eat all the virtual address space.

Any idea?

Thanks!

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OlivDev

Hi Qurx,

Don't you think that it could be a memory fragmentation issue ?

I'll take a look to find a workaround but... you'll probably need to change your OS version.

Bye