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Re: MPI problem?


From: Andreas Härtel
Subject: Re: MPI problem?
Date: Wed, 26 Feb 2020 13:49:56 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

Dear Steffen,

Thank you for your reply.

No, I do not start anything manually.
I produced a minimal script reproducing the MPI message:

Script:
import espressomd
print("Hallo")



Output:
--------------------------------------------------------------------------
An MPI process has executed an operation involving a call to the
"fork()" system call to create a child process.  Open MPI is currently
operating in a condition that could result in memory corruption or
other system errors; your MPI job may hang, crash, or produce silent
data corruption.  The use of fork() (or system() or other calls that
create child processes) is strongly discouraged.

The process that invoked fork was:

  Local host:          n4657 (PID 94506)
  MPI_COMM_WORLD rank: 0

If you are *absolutely sure* that your application will successfully
and correctly survive a call to fork(), you may disable this warning
by setting the mpi_warn_on_fork MCA parameter to 0.
--------------------------------------------------------------------------
Hallo


Does this help in any way?

Thank you and best regards,
Andreas





On 26.02.20 10:32, Steffen Hirschmann wrote:
Hi Andreas,

On 14:40 Tue 25 Feb     , Andreas Härtel wrote:
[...]
An MPI process has executed an operation involving a call to the
"fork()" system call to create a child process.
[...]
do you manually start a new process from the Python simulation script?
E.g. using os.system(), the modules subprocess or multiprocessing?
It would be beneficial if you could post the simulation script to the
mailing list.

Greetings,
Steffen


--
Dr. Andreas Härtel
Albert-Ludwigs-Universität Freiburg (University of Freiburg)
SOΦT - Statistical Physics of Soft Matter and Complex Systems
Physikalisches Institut (Institute of Physics)
Hermann-Herder-Straße 3, Hochhaus
Room 407
79104 Freiburg
Germany
Phone: +49 761 203-97783
Email: address@hidden
Web page: http://andreashaertel.anno1982.de/



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