[SOLVED] CUDA Examples segfault or are unstable

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  • 30 March 2017 at 08:48 #8848
    mbarrow
    Blocked

    Hi, I want to benchmark the CUDA TLED performance for a Neo-Hookean cube.

    I don’t have confidence in the simulator because many of the examples under src/applications/plugins/SofaCUDA/examples/ seem to be unstable or simply cause runSofa to segfault.

    I’ve tried version 16.12 and 15.03 with much the same results (15.03 seems worse however), so I’m hoping for some help.

    Does anyone have a simple .scn file known to work with ver 16.10 that uses the CUDA TLED FEM to simulate a block of Neo-Hookean solid?

    7 April 2017 at 13:52 #8892
    Hugo
    Keymaster

    Dear mbarrow,

    I recompiled the SofaCUDA plugin, there’s indeed some scene not working. About the CudaTetrahedronTLEDForceField.scn, it seems that there is some missing files.

    I asked about it, and some devs told me that is a pretty old (2009!) piece of code. Would you feel confortable-enough with the CUDA API to look at the implementation?

    Best,

    Hugo

    7 April 2017 at 18:03 #8894
    mbarrow
    Blocked

    Hi, I would like to but I’m confused about one thing. There seem to be some advanced simulators showcased on the site (Eye surgery sim, tissue tearing etc). Do these not use the CUDA TLED FEM? I would like to focus on the most state of the art implementation as the code seems complex and we want to benchmark the state of the art configuration.

    Cheers!

    11 April 2017 at 16:02 #8900
    Hugo
    Keymaster

    Hi mbarrow,

    In SOFA, the TLED approach was developed during a PhD thesis that ended in 2009. Since then, the other GPU-based simulation were implemented using the SofaCUDA plugin. These implementations do not only rely on explicit schemes. Most of them were done using implicit or semi-implicit schemes.

    Cheers,

    Hugo

    11 April 2017 at 23:58 #8905
    mbarrow
    Blocked

    Thank you Hugo. Sorry I’m a beginner. Does this mean I’ve been looking at the wrong GPU-classes if I want to benchmark state of the art SOFA GPU performance or is the Implicit / Semi-Implicit code not available for general users?

    Cheers,

    Michael

    12 April 2017 at 09:23 #8907
    Hugo
    Keymaster

    Hi mbarrrow,

    No worries. The TLED would not be my start in SOFA. You could rather have a look into the plugin SofaCUDA. There, you will find the FEM codes in their GPU version. Best,

    Hugo

    12 April 2017 at 10:57 #8908
    mbarrow
    Blocked

    Thank you, that is very helpful!

    18 April 2017 at 14:31 #8937
    Hugo
    Keymaster

    I therefore set this topic as solved.
    Do not hesitate to post further question later on, mbarrow.

    Cheers,

    Hugo

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