On Tue, 12 Mar 2013, David Knezevic wrote:

> Quick question though, because I'm not sure I understand how this works when 
> we're numbering in "var major" order. Suppose we have variables "u", "v" and 
> "p", then the dof indices corresponding to any particular node would 
> typically be very far apart when we use var-major ordering. And I also 
> thought that local dof indices are always contiguous (i.e. they're between 
> first_local_index and last_local_index), so it's not clear to me how these 
> "very far apart" dof indices would end up on a single processor, i.e. the 
> same processor as the node?

The trick is that the phrase "var major" is a lie.  "var major"
doesn't mean "first order by variables, then order by nodes", it means
"first order by processor id, then by variables, then by nodes".
---
Roy

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