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# ELPA Library
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For static calculations, it is recommended to use ELPA Library, which has better performance than ScaLapack. In particular, ELPA allows for the utilization of GPUs which provide a significant boost for calculations. In order to activate ELPA lib in [predefines.h](https://gitlab.fizyka.pw.edu.pl/gabrielw/wslda/-/tree/public/st-myproject-template/predefines.h) set:
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For static calculations, it is recommended to use [ELPA](https://elpa.mpcdf.mpg.de/) Library, which has better performance than ScaLapack. In particular, ELPA allows for the utilization of GPUs which provide a significant boost for calculations. In order to activate ELPA lib in [predefines.h](https://gitlab.fizyka.pw.edu.pl/gabrielw/wslda/-/tree/public/st-myproject-template/predefines.h) set:
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```c
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// select diagonalization routine
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#define DIAGONALIZATION_ROUTINE ELPA
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