A clue for resolving QT Creator performance



  • Hi !

    I have made some tests to find what's up about the Qt Creator performance when handling very large files (10000+ lines). I think it may be related to memory pages swapping.

    Virtual machine runs Win XP with 2 processors.

    I run the virtual machine with 512 Mb of memory = SLOW
    I run the virtual machine with 1Gb of memory = Ok
    I run the virtual machine with 2Gb of memory = Still Ok
    I run the virtual machine with 3Gb of memory = SLOW
    I run the virtual machine with 4Gb of memory = VERY VERY SLOW !!!

    If I keep memory at 2GB, everything is working fast !

    Conclusion : It is not Qt Creator that is causing the problem, it's the OS !

    Thank you !


  • Moderators

    Considering that Windows XP (non 64-bit) is not able to handle more than 3.5 GB the last option wastes memory:-)

    Do you have enough memory in your server to run a 4GB virtual machine without over-commiting? Once the OS running the VM starts to swap all is lost.

    Try running it on Linux. In my experience that is so much faster than working on windows.



  • Hi !

    About XP memory constraint and Linus being faster, I know !

    What do you mean by "Once the OS running the VM starts to swap all is lost." ?

    Thank you !



  • Swapping: clearing RAM (beacuse it is full) by copying data not used to the HDD! SLOWWWWW


  • Moderators

    [quote author="max2g" date="1382100278"]What do you mean by "Once the OS running the VM starts to swap all is lost." ?[/quote]

    Most probably Tobias meant that when your host operating system goes out of memory (because you assign too much to the virtual machine), it will start using the swap partition: and that beast resides on your hard drive, so is much slower than RAM.


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