# Largest unstructured mesh problem solved till date

What is the largest problem (in DOF) that has been solved till date using a fully unstructured mesh. I know about PFLOTRAN but I am not sure if it is the largest. If someone can point to relevant papers then that would be great.

Actually I need some pointers on creating and reading in large meshes on 4K plus cores. PFLOTRAN papers have some ideas but I am wondering if there is anything else.

• To follow up on my own reply, I've had a conversation with Ulrich Ruede the other day who showed me results of computations in which they've solved problems with $10^{12}$ unknowns. – Wolfgang Bangerth Jun 6 '12 at 21:17