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A Complete Example for a lossless cavity
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Omega3P V8.0.0 07/01/2009 $ |
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------------------------------------------------------------ |
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Copyright 2009, Advanced Computations Department |
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SLAC National Accelerator Laboratory |
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* Read Mesh: gun-v4.ncdf Partitioning Method: parmetis |
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Setup: Max: |
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0.007, Sum: |
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0.015, Balance: |
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1.002 |
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Matching: Max: |
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0.008, Sum: |
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0.015, Balance: |
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1.001 Contraction: Max: |
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0.011, Sum: |
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0.022, Balance: |
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1.001 |
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InitPart: Max: |
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0.001, Sum: |
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0.001, Balance: |
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1.000 |
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Project: Max: |
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0.000, Sum: |
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0.001, Balance: |
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1.000 |
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Initialize: Max: |
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0.002, Sum: |
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0.004, Balance: |
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1.002 |
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K-way: Max: |
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0.006, Sum: |
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0.011, Balance: |
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1.000 |
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Remap: Max: |
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0.000, Sum: |
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0.000, Balance: |
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1.000 |
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Total: Max: |
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0.035, Sum: |
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0.070, Balance: |
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1.000 |
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********************************************************** |
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*
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* Total Number of Elements read: |
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24868 |
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* Total Number of Elements used: |
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24868 |
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* Total Number of DOFs: |
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152902 |
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********************************************************** |
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* Total Volume of the strucutre is : 0.0001593555890525991 Number of Grad DOFs: 27613 |
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*
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ARPACK Loop: Shift = 439.2566356039645 |
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********************************************************* |
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* factorizing the matrix using MUMPS ... Using ParMETIS for ordering... Analysis step: 0.761027 seconds |
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Maximal per-core estimated memory |
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451 MB |
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Aggregated estimated memory |
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875 MB |
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Maximal per-core estimated memory if OOC |
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184 MB |
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Aggregated estimated memory if OOC |
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365 MB Factorization step: 39.184121 seconds |
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ncv=6 |
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nev=2 |
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Number of converged eigenpairs = 2 eigenvalue: |
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2.726061596672462e+03 |
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Frequency: 2.491200411267457e+09 |
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Residual: 2.54e-11 eigenvalue: |
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3.545447315320415e+03 |
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Frequency: 2.841033486606133e+09 |
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Residual: 1.25e-09 COMMIT MODE: 0 FREQ = 2491200411.267457 |
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k= 52.21169980638881 |
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norm(v |
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[0 |
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]) = 31.04704308504932
COMMIT MODE: 1 FREQ = 2841033486.606133 |
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k= 59.54365890101494 |
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norm(v |
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[1 |
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]) = 33.84520753989371 Number of TriSolve: 39. Average time for one TriSolv: 0.287939 Computed Total Energy (normalized by Epsilon0/2): 0.999999999999992 Computed Total Energy (normalized by Epsilon0/2): 0.9999999999999895 |
Some Explanations
The following lines show the number of elements and number of DOFs in the computation:
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*********************************************************** |
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* Total Number of Elements read: 24868 * Total Number of Elements used: 24868 * Total Number of DOFs: 152902 *********************************************************** |
The following lines show the memory usage:
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Maximal per-core estimated |
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memory 451 MB Aggregated estimated memory 875 MB Maximal per-core estimated memory if |
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OOC 184 MB
Aggregated estimated memory if OOC 365 MB
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If the Maximal per-core memory is larger than what is available, user should either increase the number of cores in the computation or use other options such as Out-of-core (OOC) solver. Note that it may not be good to use excessively large number of cores in the computation (in fact, it may hurt performance or it may fail to get results if doing so). It is often a good idea to have a few thousand elements per core in the parallel computations.
The following lines show the resulting eigen frequencies. Number of converged eigenpairs = 2
eigenvalue:
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Number of converged eigenpairs = 2 eigenvalue: 2.726061596672462e+03 |
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Frequency: 2.491200411267457e+09 |
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Residual: 2.54e-11 |
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eigenvalue: |
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3.545447315320415e+03 |
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Frequency: 2.841033486606133e+09 |
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Residual: 1.25e-09 |
Note that the residual of the eigenpair should be reasonably small to be a good solution.