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Bullet Sim not using all Threads

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can you upload your scene please 


Also try the excellent BulletSOP- search the forums here to find out more



For general multi-threading history in Houdini have a look at this PDF



And this discussion for other multi-threading behaviours


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That's because the Bullet library is (for the most part) not multi-threaded. You can turn on the "Use Parallel Constraint Solver" parameter to switch to a multithreaded implementation of the constraint solver, but it has a few differences in behaviour (see the help card for details). Things like collision detection are not multithreaded, though.

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As multithreading questions keep popping up every few weeks these days, it might be time for an explanation via lawn mowing ;)


Understanding Parallel Computing (Part 2): The Lawn Mower

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