[Pw_forum] problem with MPI

[Tianying Yan]

Dear Paolo,

Yes. Problem solved by specifying 'pw.x -in input >output' instead of 'pw.x 
< input > output'. Thanks very much!

Best, Tianying

----- Original Message ----- 
From: "Paolo Giannozzi" <giannozz at nest.sns.it>
To: <pw_forum at pwscf.org>
Sent: Monday, December 13, 2004 7:27 PM
Subject: Re: [Pw_forum] problem with MPI


On Saturday 11 December 2004 06:26, Tianying Yan wrote:


> When running on 4 processors (2 nodes), the error message in the
> output looks: [...]

>      from  read_namelists  : error #         1
>      stopping ...
>       reading namelist control

>From the manual:

  If [...] the code stops at the first namelist (``control'') and you are
  running on a PC cluster:
  your communication library (MPI) might not be properly configured
  to allow input redirection (so that you are effectively reading an
  empty file). See section "Running on parallel machines'', or inquire
  with your local computer wizard (if any).

In the section "Running on parallel machines'' you find:
  Some implementations of the MPI library may have problems with input
  redirection in parallel. If this happens, use the option -in (or
  -inp or -input), followed by the input file name. Example:
   pw.x -in input -npool 4 > output.

Paolo
-- 
Paolo Giannozzi             e-mail:  giannozz at nest.sns.it
Scuola Normale Superiore    Phone:   +39/050-509876, Fax:-563513
Piazza dei Cavalieri 7      I-56126 Pisa, Italy
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