[Pw_forum] Parallel efficiency problem

[Hande Ustunel]

Dear Haiming Li,

> However, I found that the walltime is too long for parallel calculations:
> 
>      PWSCF        :  1m 4.86s CPU time,    32m53.67s wall time 

The large discrepancy between the cpu time and the wall clock time
indicates that you have a slow connection between your machines. A huge
amount of time seems to be wasted in communication. If you can, try
submitting on the different processors on the same machine rather than
different machines.

Best wishes,
Hande

-- 
Hande Toffoli
Department of Physics
Office 439
Middle East Technical University
Ankara 06531, Turkey
Tel : +90 312 210 3264
http://www.physics.metu.edu.tr/~hande