2008/5/14 luyi <[EMAIL PROTECTED]>:

>  I have tried the command line "--implicit_neighbor_dofs" and it no
>  improvment.

This sound strange to me...
I have some DG code and without this option the assembly
is more than ten time slower because I can't get the right sparsity pattern.
The difference could be that I use MONOMIAL basis, I have never tried XYZ.
I have already send this short example to Roy some time ago and I hope
it could be useful for you.
Can I ask you what pde are you solving.

Lorenzo
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