[Pw_forum] about larger system's frequence calculation

[lidonglin556]

Dear,
  
  Did you calculate some larger system's frequence? And how to get it 
calculated fast. At present, I want to calculate a larger system of 100 atoms' 
frequence and hope it quickly. What shall I do? And is there any method? Thank 
you very much!
 
 Dong-lin Li
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