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if I have a lot of particles and system bogging down, restart Houdini?

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would restarting Houdini clear RAM to help with particle creation or should I reboot PC? I have 32G RAM

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Have you already tried clearing the RAM in the Houdini session itself by using the Cache Manager (Windows-> Cache Manager or Alt+Shift+M)? 

Usually restarting Houdini is enough to free up the RAM it is using (assuming your OS is doing garbage collection correctly), but it may not be necessary if Cache Manager can flush it.  

Writing your particles to disk is also a good way to help reduce the amount of data Houdini is having to keep in active memory if you're able to do that without much disruption to your process.

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thank you ryew, I appreciate your input on this. No I have not tried nor did I know I could, clearing RAM via cachemanager. I will give that a go and I do use filecache to save to disk.

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