[Pw_forum] gipaw parallel run is too slow

[Ren PJ]

Dear QE users,
The kpoint of my job is set to 1*1*10, so I run gipaw.x in parallel mode
by :
mpirun -np 160 gipaw.x -npool 5 <input>output
The calculation was done on cluster, each node contain 8 processors.
It can't finished after 20 hours.
But when I run it on single node by:
mpirun -np 8 gipaw.x <input>output
Each kpoint calculation only need 4h30min and takes 24h in total.
Is there any thing wrong?

Thank you.
 
================================================
Pengju Ren
renpj at dicp.ac.cn
State  Key Laboratory of Catalysis, 
Dalian Institute of Chemical Physics, 
Chinese Academy of Sciences 
457 zhongshan Road, Dalian, 116023, P.R. China