rendering with multiple cpus on one frame

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how is it possible to render with multiple cpus on a single frame?
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That pretty much happens when you hit render, if you have a multi-core setup.

Or with CPUs, do you mean multiple machines? That would be network rendering.
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im just talking about multiple cores.

according to this though that doesn't happen
http://odforce.net/wiki/index.php/FrequentlyAskedQuestions#Q:__How_does_Houdini_use_multiple_CPUs_or_cores.3F_Does_it_multithread.3F [odforce.net]

it says you have to launch mantra with an extra string.
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It says to me that you only need to use a special option if you want to do MultiProcessing. Nothing special needs to be done to use all the cores on your computer (multithread).
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ok cool. thanks.
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now that i think about it, i should have a go at getting my other quad core working with this.

i found on this page http://odforce.net/wiki/index.php/MantraRemoteRendering [odforce.net]

you can use mantra -H host1,host2
how do i get to the command line?
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the mantra rop has a command line in it's parameters, mantra allready is there , just add You stuff their
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