On 06/06/2017 12:10 PM, Weixiong Zheng wrote:
It runs in serial. The error occurs when using multiple processors.

And it really happens when you call `compress()`?

The only thing I can think of is that you didn't set up the sparsity pattern correctly. Can you show us the code that sets up the sparsity pattern of these matrices?

Best
 W.

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Wolfgang Bangerth          email:                 [email protected]
                           www: http://www.math.colostate.edu/~bangerth/

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