[Pw_forum] nmix

[Lazaro Calderin]

Dear all,

I think there is a problem with pw and the nmix parameter. The
troubleshooting section of the manual says the following about problems
of convergence of the scf cycle:

 Self-consistency is slow or does not converge. Reduce
 the beta parameter from the default value (0.7) to  0.3
 - 0.1 ... You may also try to increase nmix to more than 4 (default
 value)...

but when you try to increase nmix pw stops with the error "Wrong nmix"
because nmix is hardwired to be not greater than 4 in the program.
Specifically in the file readin.F90 there is the following line:

  if (nmix.le.0 .or. nmix.gt.4)&
       &      call error('readin','Wrong nmix',1)

This seems to be a bug (?). Any comment would be appreciated.

Thanks,
Lazaro