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# Signal: Segmentation fault (11)
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## Segmentation fault & ELPA
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```
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[gabrielw@node2067 test]$ mpirun -np 8 ./st-wslda-2d input.txt
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# CODE: ST-WSLDA-2D
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# LATTICE: 64 x 64 x 16
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# USING ELPA.
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...
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# AUTOMATIC DIVISION OF WORK - MAY NOT BE OPTIMAL!
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# SETTINGS 8 KZGROUPS, EACH WITH GRID PROCESSES OF SIZE [1 x 1]
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...
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# SETTING UP ELPA...
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# ELPA: ACTIVATING GPUs
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# ELPA: SETTINGS COMPLEX KERNEL: `ELPA_2STAGE_COMPLEX_DEFAULT`
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# ELPA: SETTINGS SOLVER: `ELPA_SOLVER_1STAGE`
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# SETTING UP OF ELPA DONE.
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...
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# DIAGONALIZATION 0 0...
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[node2067:27224] *** Process received signal ***
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[node2067:27224] Signal: Segmentation fault (11)
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[node2067:27224] Signal code: Invalid permissions (2)
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[node2067:27224] Failing at address: 0x7fd86ec00000
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[node2067:27224] [ 0] /lib64/libpthread.so.0(+0xf710)[0x7fd9359e4710]
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[node2067:27224] [ 1] /usr/local/elpa202005-openmpi311-gcc721-cuda90-lapack391/lib/libelpa.so.15(__elpa1_compute_MOD_tridiag_complex_double+0x96c)[0x7fd935f30edc]
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[node2067:27224] [ 2] /usr/local/elpa202005-openmpi311-gcc721-cuda90-lapack391/lib/libelpa.so.15(__elpa1_impl_MOD_elpa_solve_evp_complex_1stage_double_impl+0x79d)[0x7fd935f958bd]
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```
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Segmentation fault is typical error generated by diagonalization routines where there is insufficient amount of memory. In the example above calculations were executed with `p=1` and `q=1` parameters. In this case it was sufficient to set in *input* file
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```
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p 2
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q 2
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```
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to solve the problem. For more info see [Memory usage of st-wslda](Memory usage of st-wslda). |
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\ No newline at end of file |
