GPU Optimizations

The iterative part of the code has been optimize to use GPU through the Nvidia CUDA. To compile the code for GPU you first need to download the CUDA toolkit and to install it. When the installation of CUDA is done, you have first to change the file ls_extra_objs in the mbpt_laco trunk by

cp ls_extra_objs.gpu ls_extra_objs

then using the arch.inc example for gpu you can compile as always.
The GPU optimization is available only for chi0_v_algorithm 12.

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