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[netCDF #RQB-854711]: MPI/IO with unlimited dimensions

Hi Sebastian,

Could you tell us if this recently fixed bug sounds like what you


If so, the fix will be in netCDF release 4.3.1, a release candidate 
for which will soon be announced.


> Hi everybody,
> I just figured out that using collective MPI/IO in variables with
> unlimited dimensions can lead to deadlocks or wrong files.
> I have attached a small example program which can reproduce deadlock
> (and wrong output files depending on the variable "count").
> Did I do anything wrong or is this a known bug?
> My configuration:
> hdf5 1.8.11
> netcdf 4.3
> openmpi (default ubuntu installation)
> Compile command:
> mpicxx test.cpp -I/usr/local/include -L/usr/local/lib -lnetcdf -lhdf5_hl
> -lhdf5 -lz
> (netcdf and hdf5 are installed in /usr/local)
> Best regards,
> Sebastian
> --
> Sebastian Rettenberger, M.Sc.
> Technische UniversitÃt MÃnchen
> Department of Informatics
> Chair of Scientific Computing
> Boltzmannstrasse 3, 85748 Garching, Germany
> http://www5.in.tum.de/
Russ Rew                                         UCAR Unidata Program
address@hidden                      http://www.unidata.ucar.edu

Ticket Details
Ticket ID: RQB-854711
Department: Support netCDF
Priority: Normal
Status: Closed

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