====== Running ALPS ======

===== Installation =====

===== Compilation =====

The code compiles with the following compilers:
  * gfortran 
  * Intel Fortran 
  * PGI Fortran 
  * Cray Fortran 

We strongly recommend to use gfortran to compile the code. The following section shows the best flags for the different compilers.

=== gfortran Flags ===
The following gfortran flags seem to lead to best results:

<code>-O3 -DDOUBLE -ffast-math -funroll-loops -lm -I./include</code>


=== Intel Fortran Flags ===
The following Intel Fortran flags seem to lead to best results:

<code>-O3 -DDOUBLE -unroll-aggressive -opt-prefetch -fast -I./include/</code>

=== PGI Fortran Flags ===
The following PGI Fortran flags seem to lead to best results:

<code>-O3 -DDOUBLE -fast -Mipa=fast -Mfprelaxed -lm -I./include/</code>


=== Cray Fortran Flags ===
**ALPS currently shows very poor performance when compiled with the Cray compiler!**

The following Cray Fortran flags seem to lead to best results:

<code>-O3 -DDOUBLE -e m -lm -I./include/</code>


===== Execution =====

ALPS requires a namelist input with the basic parameters for each calculation. These namelist files contain a number of parameters that are described [[parameters|here]].