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  • _loeiz_May 28, 2009 9:23 AM PDT   
    Multiple worlds instance in a multithreaded environment

    Hi everybody !

    I'm trying to perfom two independant simulation using havok. To do so, I do instanciate two hkpWorld, and use them separately.

    However, I do only one call to hkBaseSystem::init(...) function, that seem reasonable. Then, I use , still independently the two worlds a two different threads that do not communicate.

    The thing is that sometimes (and I can't figue out why) after a random time of execution, the application crashes, while the two threads were executing Havok's code. I was wondering if the two worlds share some data ?

    Is it reasonable to use it like that, or should I make two call to the init function, to have two separate memory pool for the threads ?

    The other problem is when I make two calls to hkBaseSystem::init(), the first corresponding hkBaseSystem::quit() makes the application crash, while only one init and one quit call works well.

     

    Thank you in advance for your help !



    havokjasongJune 1, 2009 5:05 PM PDT
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    		 #1
    Re: Multiple worlds instance in a multithreaded environment
    hi _loeiz_,

    Havok is intentionally not thread safe for performance reasons.  What you are proposing is very doable though.  You can multithread Havok by specifying a multithreaded world type, among other things.  There is considerable documentation on how to do so.  I would recommend reading both "Common Havok Components/Multithreading" and "Havok Physics/Multithreading Issues".

    The memory managers are thread safe, but you will introduce a performance bottleneck unless you use seperate memory pools. Look at "Common Havok Components/Havok Base Library/Memory Management/Multithreaded Memory".

    Let me know if these help you with what you are tring to accomplish.

    cheers,
    jason


    Jason Gorski
    Developer Support Engineer
    Havok™
    2008 Emmy Award Winner
    \"Turning Creative Aspirations into Technical Realities™\"
    www.havok.com

    havokchrisJune 6, 2009 1:25 AM PDT
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    		 #2
    Re: Multiple worlds instance in a multithreaded environment
    Hi Loeiz,
    In addition to what Jason said above:

    You should call hkBaseSystem::init in your main thread. You also need to call hkBaseSystem::initThread in each other thread that uses Havok - this sets up a thread-local instance of hkThreadMemory.

    If that still doesn't work, can you provide some of the information (e.g. callstacks, assert messages) described here:

    http://software.intel.com/en-us/forums/showthread.php?t=62766

    Thanks!

    -Chris


    abraxaxMarch 14, 2010 3:04 PM PDT
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    		 #3 Reply To #1
    Re: Multiple worlds instance in a multithreaded environment
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