[Pw_forum] A problem of parallel excuting pwcond.x

[Paolo Giannozzi]

in theory, well-designed parallel code should work (or cleanly stop) on any
number of processors. In practice, if you use a disproportionate number of
processors, the code may not be able to deal with it. IN any case: look at
what happens at line 444 of PWCOND/src/scatter_forw.f90 aqnd maybe you sill
understand what is happening and why

Paolo

Paolo

On Mon, Aug 10, 2015 at 9:27 AM, 庞瑞(PANG Rui) <pang.r at sustc.edu.cn> wrote:

However, I found I could run the example correctly by using only 8 cores.
> If using 16, 32 and 64 cores, the code will stop at
> " ngper, shell number =          804          82
>  ngper, n2d =          804         391
> ---  E-Ef =    2.0000000  k =    0.5000000   0.5000000
> ---  ie =          1  ik =          1"
>
> and showed
>
>
> "forrtl: severe (174): SIGSEGV, segmentation fault occurred
> Image              PC                Routine            Line
> Source
>
> pwcond.x           00000000025AD7C9  Unknown               Unknown  Unknown
> pwcond.x           00000000025AC140  Unknown               Unknown  Unknown
> pwcond.x           000000000255DBC2  Unknown               Unknown  Unknown
> pwcond.x           00000000024F15F3  Unknown               Unknown  Unknown
> pwcond.x           00000000024F753B  Unknown               Unknown  Unknown
> libpthread.so.0    0000003F2280F710  Unknown               Unknown  Unknown
> pwcond.x           00000000004F9B35  scatter_forw_             444
> scatter_forw.
> f90
> pwcond.x           00000000004ADD66  do_cond_                  518
> do_cond.f90
> pwcond.x           00000000004A8B42  MAIN__                     22
> condmain.f90
> pwcond.x           0000000000498036  Unknown               Unknown  Unknown
> libc.so.6          0000003F2241ED1D  Unknown               Unknown  Unknown
> pwcond.x           0000000000497F29  Unknown               Unknown
> Unknown"
>
> So could anyone tell me how can I  fix this error so that I can using more
> cores to excute pwcond.x? I met this problem in both 5.1.2 and 5.2.
>
> Thanks very much for any help.
>
> Sincerely.
>
> Pang Rui
>
>
>
>
>
> ------------------
> 庞瑞(PANG Rui)
>
> South University of Science and Technology of China/Department of Physics
>
> No.1088,Xueyuan Road, Shenzhen,Guangdong
>
>
>
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> Pw_forum at pwscf.org
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>



-- 
Paolo Giannozzi, Dept. Chemistry&Physics&Environment,
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy
Phone +39-0432-558216, fax +39-0432-558222
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