[ET Trac] [Einstein Toolkit] #1548: stdout redirection in multithreading scenario

[Einstein Toolkit]

#1548: stdout redirection in multithreading scenario
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  Reporter:  gzheng@…             |       Owner:                     
      Type:  defect               |      Status:  reopened           
  Priority:  major                |   Milestone:                     
 Component:  Cactus               |     Version:  development version
Resolution:                       |    Keywords:  stdout redirection 
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Comment (by rhaas):

 Interesting. Why did I close the ticket? That was not quite intended.
 Anyhow. Thank you for the clarification. I am not sure though what to do
 about it. We can certainly fairly easily create one output file per MPI
 rank and store the FILE* pointers inside of a threadprivate (or the
 equivalent thread local storage type of the compiler if we don't want to
 rely on OpenMP threads being the same as "threads" in general or that the
 only threads that we will encounter are OpenMP generated and not eg from
 pthread in HTTPD) static so that CCTK_Warn etc write to separate files per
 MPI rank. I am not aware of anything that would allow us to redirect
 output to stdout on a per-thread basis since he POSIX dup call that we use
 is per-process (and file ids are per-process entities as far as I know).

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1548#comment:3>
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