[Pw_forum] a strange behavior for QE-v4 compared with QE-v3

[lan haiping]

Dear All,

 I am performing a series tests on a RHEL-intel 4-core 2cpu workstation with
ifort 9 and mpi-1.2.6.

A strange  behavior is found for QE v4 when i carry out parallel
executation.  For example,  i just ran the script supplied in
$QE/example/example10. Using 'top' command, i found load in each cpu is
highly unbalanced :
%cpu %mem
  151  0.2   0:20.38 pw.x
  130  0.2   0:19.40 pw.x
  103  0.2   0:19.99 pw.x
    92  0.2   0:13.82 pw.x
    81  0.2   0:17.89 pw.x
    79  0.2   0:14.01 pw.x
    76  0.2   0:14.01 pw.x
   74  0.2   0:14.02 pw.x

But this situation doesnot happen when i try to run the same work with
QE-v3.
Would you please give me some hints or suggestion to tune  the performance
for
 QE v4 ?
Thanks in advance, and best regards!

Hai-Ping

-- 
Hai-Ping Lan
Department of Electronics ,
Peking University , Bejing, 100871
lanhaiping at gmail.com, hplan at pku.edu.cn
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