[solved] I need more than 1.4 Gb memory



  • Hi erverybody,

    I need to used more than 1.4Go of memory for my application.
    Who can I do this?

    If used more than 1.4Gb, my application crash.



  • What hardware and operating system are you using?



  • I use Qt 5.2 with mingw 4.8 32 bit under windows 8.1

    And I have 64 Gb of memory


  • Moderators

    It's an OS limitation. Windows exposes only 2GB of addressable memory space to 32 bit processes. Adding to that a minimum allocation size, fragmentation and alignment requirements you're hitting the upper deck.

    You could compile your app with /LARGEADDRESSAWARE. That would up the addressable space to 4GB (3.something in practice) on 64 bit system and to 3GB (2.something in practice) on a 32 bit Windows with /3GB switch.

    In practice I would recommend to optimize your app. Either make it use less memory or switch to 64bit. It's 2015. It's time ;)



  • @Chris-Kawa said:

    It's an OS limitation. Windows exposes only 2GB of addressable memory space to 32 bit processes. Adding to that a minimum allocation size, fragmentation and alignment requirements you're hitting the upper deck.

    You could compile your app with /LARGEADDRESSAWARE. That would up the addressable space to 4GB (3.something in practice) on 64 bit system and to 3GB (2.something in practice) on a 32 bit Windows with /3GB switch.

    In practice I would recommend to optimize your app. Either make it use less memory or switch to 64bit. It's 2015. It's time ;)

    Thx,

    I try to pass my app in 64 bits but I have some dll of harware only avilable in 32 bits.
    And I don't know how compile in 64 bit with Qt. It's complicatied I found. And everything I trired doesn't work.
    I ask this because my app can import/export datas and in this data, I have big pixmap (10800*800), I can have several pixamp in exportation.
    If I export more than 40 pixmap, I have more than 1,4 Gb in memory and my apps crash.
    I don't know how to prevent this.

    Thx for your reply.



  • @Franckynos It is a lot of extra work, but you can access 32bit dlls from a 64bit program with some extra work arounds.



  • @Franckynos
    Check this for precompiled 64 bit Qt:
    http://tver-soft.org/qt64



  • @sirop OHHHHH !! Thank you very much !!! I haven't found this before !!!! :D



  • @Goddard I'll try access to my lib 32 bits after install Qt 64 bit. I'll let you know.



  • Hi,
    I think it's on way...
    My compilation has passed !!!
    I have juste some error with linking library, I have compiled in 64bits my personnal library. That remove some errors, but I have one that can't be recompile, (supplier lib) who can I include it ?
    You have an idea @Goddard ?

    Thx your reply.


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