On 6/12/23 02:57, Abbas Ballout wrote:
**
I am running step 18.
This is the output I getting for a single quasi-tatic step with mpirun 1 :
/Cycle 0:
Number of active cells: 3712 (by partition: 3712)
Number of degrees of freedom: 17226 (by partition: 17226)
Assembling system... norm of rhs is 1.88062e+10
Solver converged in 103 iterations.
Updating quadrature point data...
Cycle 1:
Number of active cells: 12805 (by partition: 12805)
Number of degrees of freedom: 51708 (by partition: 51708)
Assembling system... norm of rhs is 1.86145e+10
Solver converged in 120 iterations.
Updating quadrature point data...
Moving mesh../.
And this is the output I get when mpirun 3:
/Timestep 1 at time 1
Cycle 0:
Number of active cells: 3712 (by partition: 1360+1286+1066)
Number of degrees of freedom: 17226 (by partition: 6651+5922+4653)
Assembling system... norm of rhs is 1.88062e+10
Solver converged in 131 iterations.
Updating quadrature point data...
Cycle 1:
Number of active cells: 12805 (by partition: 4565+4425+3815)
Number of degrees of freedom: 51708 (by partition: 19983+17250+14475)
Assembling system... norm of rhs is 3.67161e+10
Solver converged in 126 iterations.
Updating quadrature point data...
Moving mesh.../
The L2 norm in cycle 1 is different between runs with mpi 1 and mpi 3. Is this
normal?
This is an interesting observation. It strikes me as a bug.
Have you compared the solution you get after running either 1 or 3 MPI
processes? If you visualize the result, or compute some other indicator of the
solution, in which ways do they differ?
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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