[Pw_forum] error: npert > max_irr_dim

[Aritz Leonardo]

Hello all.

While performing a phonon calculation on a monolayer of C I got the
following error:

 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
     task #         1
     from set_irr : error #         0
     npert > max_irr_dim
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Searching the pw_forum archive, the solution seems to be to recompile
the code using a bigger value for max_irr_dim parameter.

But.... from the archive:"The parameter defines maximum allowed number
of degeneracy of modes"

Could somebody tell me what does this mean?

By the way, I have made exactly the same calculation (all the parameters
being identical and with the same list of q vectors) but changing
ecutwfc from 35 ryd to 32. In this case there was no error.

Am I going beyond any kind of limit?

thank a lot